Horologium (constellation)

Short description: Constellation in the southern celestial hemisphere

HorologiumConstellation

List of stars in Horologium

Abbreviation| Hor
Genitive| Horologii
Pronunciation| /ˌhɒrəˈloʊdʒiəm, -ˈlɒ-/,[1]
genitive /ˌhɒrəˈloʊdʒiˌaɪ, -ˈlɒ-/
Symbolism| The Pendulum Clock
Right ascension|  02h 12m 48.5665s– 04h 20m 18.3390s[2]
Declination| −39.6368256°–−67.0358200°[2]
Quadrant| SQ1
Area| 249 sq. deg. (58th)
Main stars| 6
Bayer/Flamsteed
stars| 10
Stars with planets| 4
Stars brighter than 3.00m| 0
Stars within 10.00 pc (32.62 ly)| 1
Brightest star| α Hor (3.85m)
Messier objects| 0
Meteor showers| 0
Bordering
constellations| Eridanus
Hydrus
Reticulum
Dorado
Caelum
Visible at latitudes between +30° and −90°.
Best visible at 21:00 (9 p.m.) during the month of December.

Horologium (Latin hōrologium, the pendulum clock, from Greek ὡρολόγιον, lit. an instrument for telling the hour) is a constellation of six stars faintly visible in the southern celestial hemisphere. It was first described by the French astronomer Nicolas-Louis de Lacaille in 1756 and visualized by him as a clock with a pendulum and a second hand. In 1922 the constellation was redefined by the International Astronomical Union (IAU) as a region of the celestial sphere containing Lacaille's stars, and has since been an IAU designated constellation. Horologium's associated region is wholly visible to observers south of 23°N.

The constellation's brightest star—and the only one brighter than an apparent magnitude of 4—is Alpha Horologii (at 3.85), an aging orange giant star that has swollen to around 11 times the diameter of the Sun. The long-period variable-brightness star, R Horologii (4.7 to 14.3), has one of the largest variations in brightness among all stars in the night sky visible to the unaided eye. Four star systems in the constellation are known to have exoplanets; at least one—Gliese 1061—contains an exoplanet in its habitable zone.

## Contents

* 1 History
* 2 Characteristics
* 3 Features
* 3.1 Stars
* 3.2 Deep-sky objects
* 4 See also
* 5 Notes
* 6 References
* 6.1 Works cited
* 7 External links

## History

The French astronomer Nicolas-Louis de Lacaille first described the constellation as l'Horloge à pendule & à secondes (Clock with pendulum and seconds hand) in 1756,[3][4] after he had observed and catalogued almost 10,000 southern stars during a two-year stay at the Cape of Good Hope. He devised fourteen new constellations in previously uncharted regions of the southern celestial hemisphere, which were not visible from Europe. All but one honoured scientific instruments, and so symbolised the Age of Enlightenment.[lower-alpha 1] The constellation name was Latinised to Horologium in a catalogue and updated chart published posthumously in 1763.[5] The Latin term is ultimately derived from the Ancient Greek ὡρολόγιον, for an instrument for telling the hour.[6]

## Characteristics

Horologium constellation: showing the tangent line, or viewer's horizon, at latitude approx 23 N, which is parallel to the line of -67.04 declension, the lower declination boundary of the constellation.

Covering a total of 248.9 square degrees or 0.603% of the sky, Horologium ranks 58th in area out of the 88 modern constellations.[7] Its position in the southern celestial hemisphere means the whole constellation is visible to observers south of 23°N.[7][lower-alpha 2] Horologium is bordered by five constellations: Eridanus (the Po river or Nile river), Caelum (the chisel), Reticulum (the reticle), Dorado (the dolphin/swordfish), and Hydrus (the male water snake). The three letter abbreviation for the constellation, as adopted by the International Astronomical Union in 1922, is "Hor".[8] The official constellation boundaries are defined by a twenty-two-sided polygon (illustrated in infobox). In the equatorial coordinate system, the right ascension coordinates of these borders lie between  02h 12.8m and  04h 20.3m, while the declination coordinates are between −39.64° and −67.04°.[9]

## Features

The constellation Horologium as it can be seen by the naked eye

### Stars

Horologium has one star brighter than apparent magnitude 4,[10] and 41 stars brighter than or equal to magnitude 6.5.[lower-alpha 3][7] Lacaille charted and designated 11 stars in the constellation, giving them the Bayer designations Alpha (α Hor) through Lambda Horologii (λ Hor) in 1756. In the mid-19th century, English astronomer Francis Baily removed the designations of two—Epsilon and Theta Horologii—as he held they were too faint to warrant naming. He was unable to find a star that corresponded to the coordinates of Lacaille's Beta Horologii. Determining that the coordinates were wrong, he assigned the designation to another star. Kappa Horologii, too, was unable to be verified—although it most likely was the star HD 18292—and the name fell out of use. In 1879, American astronomer Benjamin Apthorp Gould assigned designations to what became Mu and Nu Horologii as he felt they were bright enough to warrant them.[5]

At magnitude 3.9, Alpha Horologii is the brightest star in the constellation, located 115 (± 0.5) light-years from Earth.[12] German astronomer Johann Elert Bode depicted it as the pendulum of the clock, while Lacaille made it one of the weights.[13] It is an orange giant star of spectral type K2III that has swollen to around 11 times the diameter of the Sun, having spent much of its life as a white main-sequence star.[14] At an estimated 1.55 times the mass of the Sun,[15] it is radiating 38 times the Sun's luminosity from its photosphere at an effective (surface) temperature of 5,028 K.[16]

At magnitude 4.93, Delta Horologii is the second-brightest star in the constellation,[17] and forms a wide optical double with Alpha.[18] Delta itself is a true binary system composed of a white main sequence star of spectral type A5V that is 1.41 times as massive as the Sun with a magnitude of 5.15 and its fainter companion of magnitude 7.29.[19] The system is located 179 (± 4) light-years from the earth.[12]

At magnitude 5.0, Beta Horologii is a white giant 63 times as luminous as the Sun with an effective temperature of 8,303 K.[16] It is 312 (± 4) light-years from Earth,[20] and has been little-studied.[17] Lambda Horologii is an ageing yellow-white giant star of spectral type F2III that spins around at 140 km/second, and is hence mildly flattened at its poles (oblate).[21] It is 161 (± 1) light-years from Earth.[12]

With a magnitude of 5.24,[22] Nu Horologii is a white main sequence star of spectral type A2V located 169 (± 1) light-years from Earth[23] that is around 1.9 times as massive as the Sun. Estimated to be around 540 million years old, it has a debris disk that appears to have two components: an inner disk is orbiting at a distance of 96+9
−37 AU, while an outer disk lies 410+24
−96 AU from the star. The estimated mass of the disks is 0.13%±0.07% the mass of the Earth.[22]

Horologium has several variable stars. R Horologii is a red giant Mira variable with one of the widest ranges in brightness known of stars in the night sky visible to the unaided eye.[24] It is around 1,000 light-years from Earth.[25] It has a minimum magnitude of 14.3 and a maximum magnitude of 4.7, with a period of approximately 13 months.[26] T and U Horologii are also Mira variables.[18] The Astronomical Society of Southern Africa reported in 2003 that observations of these two stars were needed as data on their light curves was incomplete.[27] TW Horologii is a semiregular variable red giant star that is classified as a carbon star,[26] and is 1,370 (± 70) light-years from Earth.[28]

Iota Horologii is a yellow-white dwarf star 1.23 (± 0.12) times as massive and 1.16 (± 0.04) times as wide as the Sun with a spectral type of F8V,[29] 57 (± 0.05) light-years from Earth.[30] Its chemical profile, movement and age indicate it formed within the Hyades cluster but has drifted around 130 light-years away from the other members.[31] It has a planet at least 2.5 times as massive as Jupiter orbiting it every 307 days.[32] HD 27631 is a Sun-like star located 164 (± 0.3) light-years from Earth[33] which was found to have a planet at least 1.45 times as massive as Jupiter that takes 2,208 (± 66) days (six years) to complete an orbit.[34] WASP-120 is a yellow-white main-sequence star around 1.4 times as massive as the Sun with a spectral type of F5V that is estimated to be 2.6 (± 0.5) billion years old. It has a massive planet around 4.85 times the mass of Jupiter that completes its orbit every 3.6 days, and has an estimated surface temperature of 1,880 (± 70) K.[35]

With an apparent magnitude of 13.06, Gliese 1061 is a red dwarf of spectral type M5.5V that has 12% of the mass and 15% of the diameter of the Sun, and shines with only 0.17% of its luminosity. Located 12 light-years away from Earth, it is the 20th-closest single star or stellar system to the Sun. In August 2019, it was announced that it had three planets, one of which lay in its habitable zone.[36]

### Deep-sky objects

Composite image of NGC 1512 (left) and the dwarf galaxy NGC 1510

Horologium is home to many deep-sky objects, including several globular clusters. NGC 1261 is a globular cluster of magnitude 8, located 53,000 light-years from Earth.[26] It lies 4.7 degrees north-northeast of Mu Horologii.[37] The globular cluster Arp-Madore 1 is the most remote known globular cluster in the Milky Way at a distance of 123.3 kiloparsecs (402,000 light-years) from Earth.[38]

NGC 1512 is a barred spiral galaxy 2.1 degrees west-southwest of Alpha Horologii with an apparent magnitude of 10.2.[37] About five arcmin (13.8 kpc) away is the dwarf lenticular galaxy NGC 1510. The two are in the process of a merger which has been going on for 400 million years.[39]

The Horologium-Reticulum Supercluster is a galaxy supercluster, second in size only to the Shapley Supercluster in the local universe (anything within 200 mpc of Earth). It contains over 20 Abell galaxy clusters and covers more than 100 deg2 of the sky, centered roughly at equatorial coordinates α =  03h 19m, δ = 50° 2′.[40]

## See also

* Horologium (Chinese astronomy)

## Notes

1. ↑ The exception is Mensa, named for Table Mountain. The other twelve (alongside Horologium) are Antlia, Caelum, Circinus, Fornax, Microscopium, Norma, Octans, Pictor, Pyxis, Reticulum, Sculptor and Telescopium.[5]
2. ↑ While parts of the constellation technically rise above the horizon to observers between the latitudes of 23°N and 50°N, those stars within a few degrees of the horizon are difficult to see.[7]
3. ↑ Objects of magnitude 6.5 are among the faintest visible to the unaided eye from locations between suburban and rural areas in night skies.[11]

## References

1. ↑ "Horologium". Horologium. Oxford University Press. http://www.lexico.com/definition/Horologium.
2. ↑ 2.0 2.1 IAU, The Constellations, Horologium.
3. ↑ Ridpath, Ian. "Horologium". Star Tales. Self-published. http://www.ianridpath.com/startales/horologium.html.
4. ↑ Lacaille, Nicolas Louis (1756). "Relation abrégée du Voyage fait par ordre du Roi au cap de Bonne-espérance" (in fr). Mémoires de l'Académie Royale des Sciences: 519–592 [588]. https://gallica.bnf.fr/ark:/12148/bpt6k35505/f786. Retrieved 2016-03-19.
5. ↑ 5.0 5.1 5.2 Wagman, Morton (2003). Lost Stars: Lost, Missing and Troublesome Stars from the Catalogues of Johannes Bayer, Nicholas Louis de Lacaille, John Flamsteed, and Sundry Others. Blacksburg, Virginia: The McDonald & Woodward Publishing Company. pp. 6–7, 169–170. ISBN 978-0939923786.
6. ↑ "horologe, noun". Oxford English Dictionary. https://www.oed.com/view/Entry/88531#eid1280061. (subscription required)
7. ↑ 7.0 7.1 7.2 7.3 Ridpath, Ian. "Constellations: Andromeda–Indus". Star Tales. self-published. http://www.ianridpath.com/constellations1.html.
8. ↑ Russell, Henry Norris (1922). "The New International Symbols for the Constellations". Popular Astronomy 30: 469. Bibcode: 1922PA.....30..469R.
9. ↑ "Horologium, Constellation Boundary". The Constellations (International Astronomical Union). https://www.iau.org/public/constellations/#hor. Retrieved 3 September 2020.
10. ↑ Moore, Patrick; Tirion, Wil (1997). Cambridge Guide to Stars and Planets. Cambridge, UK: Cambridge University Press. p. 190. ISBN 978-0521585828. https://archive.org/details/cambridgeguideto00moor.
11. ↑ Bortle, John E. (February 2001). "The Bortle Dark-Sky Scale". Sky & Telescope. Sky Publishing Corporation. http://www.skyandtelescope.com/resources/darksky/3304011.html?page=1&c=y.
12. ↑ 12.0 12.1 12.2 van Leeuwen, F. (2007). "Validation of the New Hipparcos Reduction". Astronomy and Astrophysics 474 (2): 653–664. doi:10.1051/0004-6361:20078357. Bibcode: 2007A&A...474..653V.
13. ↑ Ridpath, Ian. "Horologium". Star Tales. self-published. http://www.ianridpath.com/startales/horologium.html.
14. ↑ Kaler, Jim. "Alpha Horologii". http://stars.astro.illinois.edu/sow/alphahor.html.
15. ↑ Liu, Y. J.; Zhao, G.; Shi, J. R.; Pietrzyński, G.; Gieren, W. (2007). "The Abundances of Nearby Red Clump Giants". Monthly Notices of the Royal Astronomical Society 382 (2): 553–566. doi:10.1111/j.1365-2966.2007.11852.x. Bibcode: 2007MNRAS.382..553L.
16. ↑ 16.0 16.1 McDonald, I.; Zijlstra, A. A.; Boyer, M. L. (2012). "Fundamental Parameters and Infrared Excesses of Hipparcos Stars". Monthly Notices of the Royal Astronomical Society 427 (1): 343–357. doi:10.1111/j.1365-2966.2012.21873.x. Bibcode: 2012MNRAS.427..343M.
17. ↑ 17.0 17.1 Kaler, Jim (21 January 2011). "Beta Horologii". http://stars.astro.illinois.edu/sow/betahor.html.
18. ↑ 18.0 18.1 Arnold, H.J.P; Doherty, Paul; Moore, Patrick (1999). The Photographic Atlas of the Stars. Boca Raton, Florida: CRC Press. p. 48. ISBN 978-0750306546. https://books.google.com/books?id=YjcvJUfnWBAC&pg=PA48.
19. ↑ Eggleton, P. P.; Tokovinin, A. A. (2008). "A Catalogue of Multiplicity among Bright Stellar Systems". Monthly Notices of the Royal Astronomical Society 389 (2): 869–879. doi:10.1111/j.1365-2966.2008.13596.x. Bibcode: 2008MNRAS.389..869E.
20. ↑ Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
21. ↑ Belle, G. T. (2012). "Interferometric Observations of Rapidly Rotating Stars". The Astronomy and Astrophysics Review 20 (1): 51. doi:10.1007/s00159-012-0051-2. Bibcode: 2012A&ARv..20...51V.
22. ↑ 22.0 22.1 Meshkat, Tiffany; Bailey, Vanessa P.; Su, Kate Y. L.; Kenworthy, Matthew A.; Mamajek, Eric E.; Hinz, Philip M.; Smith, Paul S. (2015). "Searching for Planets in Holey Debris Disks with the Apodizing Phase Plate". The Astrophysical Journal 800 (1): 5. doi:10.1088/0004-637X/800/1/5. 5. Bibcode: 2015ApJ...800....5M.
23. ↑ Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
24. ↑ Privett, Grant; Jones, Kevin (2013). The Constellation Observing Atlas. New York: Springer Science & Business Media. p. 102. ISBN 978-1461476481. https://books.google.com/books?id=uN69BAAAQBAJ&pg=PA102. Retrieved 2016-03-18.
25. ↑ Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
26. ↑ 26.0 26.1 26.2 Ridpath, Ian; Tirion, Wil (2017). Stars and Planets Guide. London: Collins. p. 158. ISBN 978-0-00-823927-5.
27. ↑ Cooper, Tim (2003). "Presidential Address: Amateur Observations – Successes and Opportunities". Monthly Notes of the Astronomical Society of Southern Africa 62: 234–240. Bibcode: 2003MNSSA..62..234C.
28. ↑ Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
29. ↑ Bruntt, H.; Bedding, T. R.; Quirion, P.-O.; Lo Curto, G.; Carrier, F.; Smalley, B.; Dall, T. H.; Arentoft, T. et al. (2010). "Accurate Fundamental Parameters for 23 Bright Solar-type Stars". Monthly Notices of the Royal Astronomical Society 405 (3): 1907–1923. doi:10.1111/j.1365-2966.2010.16575.x. Bibcode: 2010MNRAS.405.1907B.
30. ↑ Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
31. ↑ Vauclair, S.; Laymand, M.; Bouchy, F.; Vauclair, G.; Hui Bon Hoa, A.; Charpinet, S.; Bazot, M. (2008). "The Exoplanet-host Star Iota Horologii: an Evaporated Member of the Primordial Hyades Cluster". Astronomy and Astrophysics 482 (2): L5–L8. doi:10.1051/0004-6361:20079342. Bibcode: 2008A&A...482L...5V.
32. ↑ Zechmeister, M.; Kürster, M.; Endl, M.; Lo Curto, G.; Hartman, H.; Nilsson, H.; Henning, T.; Hatzes, A. P. et al. (2013). "The Planet Search Programme at the ESO CES and HARPS. IV. The Search for Jupiter Analogues around Solar-like Stars". Astronomy and Astrophysics 552: A78. doi:10.1051/0004-6361/201116551. Bibcode: 2013A&A...552A..78Z.
33. ↑ Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
34. ↑ Marmier, M.; Ségransan, D.; Udry, S.; Mayor, M.; Pepe, F.; Queloz, D.; Lovis, C.; Naef, D. et al. (2013). "The CORALIE Survey for Southern Extrasolar Planets XVII. New and Updated Long Period and Massive Planets". Astronomy and Astrophysics 551: A90. doi:10.1051/0004-6361/201219639. Bibcode: 2013A&A...551A..90M.
35. ↑ Turner, O. D; Anderson, D. R; Collier Cameron, A; Delrez, L; Evans, D. F; Gillon, M; Hellier, C; Jehin, E et al. (2016). "WASP-120 b, WASP-122 b, and WASP-123 b: Three Newly Discovered Planets from the WASP-South Survey". Publications of the Astronomical Society of the Pacific 128 (964): 064401. doi:10.1088/1538-3873/128/964/064401. Bibcode: 2016PASP..128f4401T.
36. ↑ Dreizler, S.; Jeffers, S. V.; Rodríguez, E.; Zechmeister, M.; Barnes, J.R.; Haswell, C.A.; Coleman, G. A. L.; Lalitha, S. et al. (2019-08-13). "Red Dots: A temperate 1.5 Earth-mass planet in a compact multi-terrestrial planet system around GJ1061" (in en). Monthly Notices of the Royal Astronomical Society. doi:10.1093/mnras/staa248.
37. ↑ 37.0 37.1 Bakich, Michael E. (2010). 1001 Celestial Wonders to See Before You Die: The Best Sky Objects for Star Gazers. Springer. pp. 402, 416. ISBN 978-1441917775.
38. ↑ Vasiliev, Eugene (2019). "Proper Motions and Dynamics of the Milky Way Globular Cluster System from Gaia DR2". Monthly Notices of the Royal Astronomical Society 484 (2): 2832–2850. doi:10.1093/mnras/stz171. Bibcode: 2019MNRAS.484.2832V.
39. ↑ Koribalski, Bärbel S.; López-Sánchez, Ángel R. (2009). "Gas Dynamics and Star Formation in the Galaxy Pair NGC 1512/1510". Monthly Notices of the Royal Astronomical Society 400 (4): 21. doi:10.1111/j.1365-2966.2009.15610.x. Bibcode: 2009MNRAS.400.1749K.
40. ↑ Fleenor, Matthew C.; Rose, James A.; Christiansen, Wayne A.; Hunstead, Richard W.; Johnston-Hollitt, Melanie; Drinkwater, Michael J.; Saunders, William (September 2005). "Large-Scale Velocity Structures in the Horologium-Reticulum Supercluster". The Astronomical Journal 130 (3): 957–967. doi:10.1086/431972. Bibcode: 2005AJ....130..957F.

### Works cited

* "Horologium". The Constellations. International Astronomical Union. https://www.iau.org/public/themes/constellations/#hor.

## External links

| Wikimedia Commons has media related to Horologium.

|

* The Deep Photographic Guide to the Constellations: Horologium
* The clickable Horologium
* Starry Night Photography – Horologium Constellation

* v
* t
* e

Constellation of Horologium

* List of stars in Horologium
* Horologium in Chinese astronomy

Stars|

| Bayer|

* α
* β
* γ
* δ
* ζ
* η
* ι
* λ
* μ
* ν

|

Variable|

* R
* TU
* TW
* TZ
* WW

HR|

* 688
* 734
* 755
* 821
* 823
* 866
* 871
* 960
* 998
* 1021
* 1090
* 1167
* 1169
* 1216
* 1323
* 1364

HD|

* 18292
* 21360
* 23308
* 27631

Other|

* DENIS 0334-49
* Gliese 146
* Gliese 1061
* WASP-120

| Exoplanets|

* ι Horologii b

|

Star
clusters|

| NGC|

* 1252
* 1261

|

Other|

* Arp-Madore 1

Galaxies|

| NGC|

* 888
* 1025
* 1031
* 1096
* 1135
* 1136
* 1244
* 1246
* 1249
* 1311
* 1356
* 1411
* 1433
* 1448
* 1476
* 1483
* 1493
* 1494
* 1495
* 1510
* 1512
* 1527

|

| Galaxy clusters|

* Horologium Supercluster

|

Category

* v
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* e

The 88 modern constellations

* Andromeda
* Antlia
* Apus
* Aquarius
* Aquila
* Ara
* Aries
* Auriga
* Boötes
* Caelum
* Camelopardalis
* Cancer
* Canes Venatici
* Canis Major
* Canis Minor
* Capricornus
* Carina
* Cassiopeia
* Centaurus
* Cepheus
* Cetus
* Chamaeleon
* Circinus
* Columba
* Coma Berenices
* Corona Australis
* Corona Borealis
* Corvus
* Crater
* Crux
* Cygnus
* Delphinus
* Dorado
* Draco
* Equuleus
* Eridanus
* Fornax
* Gemini
* Grus
* Hercules
* Horologium
* Hydra
* Hydrus
* Indus
* Lacerta
* Leo
* Leo Minor
* Lepus
* Libra
* Lupus
* Lynx
* Lyra
* Mensa
* Microscopium
* Monoceros
* Musca
* Norma
* Octans
* Ophiuchus
* Orion
* Pavo
* Pegasus
* Perseus
* Phoenix
* Pictor
* Pisces
* Piscis Austrinus
* Puppis
* Pyxis
* Reticulum
* Sagitta
* Sagittarius
* Scorpius
* Sculptor
* Scutum
* Serpens
* Sextans
* Taurus
* Telescopium
* Triangulum
* Triangulum Australe
* Tucana
* Ursa Major
* Ursa Minor
* Vela
* Virgo
* Volans
* Vulpecula

* Lists of constellations

* v
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* e

Constellation history

* v
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* e

The 48 constellations listed by Ptolemy after 150 AD

* Andromeda
* Aquarius
* Aquila
* Ara
* Argo Navis
* Aries
* Auriga
* Boötes
* Cancer
* Canis Major
* Canis Minor
* Capricornus
* Cassiopeia
* Centaurus
* Cepheus
* Cetus
* Corona Australis
* Corona Borealis
* Corvus
* Crater
* Cygnus
* Delphinus
* Draco
* Equuleus
* Eridanus
* Gemini
* Hercules
* Hydra
* Leo
* Lepus
* Libra
* Lupus
* Lyra
* Ophiuchus
* Orion
* Pegasus
* Perseus
* Pisces
* Piscis Austrinus
* Sagitta
* Sagittarius
* Scorpius
* Serpens
* Taurus
* Triangulum
* Ursa Major
* Ursa Minor
* Virgo

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The 41 additional constellations added in the 16th and 17th centuries

* Vespucci or Corsalius early 16c: Crux
* Triangulum Australe
* Vopel 1536: Coma Berenices
* Keyser & de Houtman 1596: Apus
* Chamaeleon
* Dorado
* Grus
* Hydrus
* Indus
* Musca
* Pavo
* Phoenix
* Tucana
* Volans
* Plancius 1613: Camelopardalis
* Columba
* Monoceros
* Habrecht 1621: Reticulum
* Hevelius 1683: Canes Venatici
* Lacerta
* Leo Minor
* Lynx
* Scutum
* Sextans
* Vulpecula
* de Lacaille 1763: Antlia
* Caelum
* Carina
* Circinus
* Fornax
* Horologium
* Mensa
* Microscopium
* Norma
* Octans
* Pictor
* Puppis
* Pyxis
* Sculptor
* Telescopium
* Vela

* v
* t
* e

Obsolete constellations (including Ptolemy's Argo Navis)

* Anser
* Antinous
* Apes
* Argo Navis
* Asterion
* Cancer Minor
* Cerberus
* Chara
* Custos Messium
* Felis
* Frederici Honores/Gloria Frederici
* Gallus
* Globus Aerostaticus
* Jordanus
* Lilium
* Lochium Funis
* Machina Electrica
* Malus
* Mons Maenalus
* Musca Borealis
* Noctua
* Officina Typographica
* Polophylax
* Psalterium Georgianum/Harpa Georgii
* Quadrans Muralis
* Ramus Pomifer
* Robur Carolinum
* Sceptrum Brandenburgicum
* Sceptrum et Manus Iustitiae
* Solarium
* Rangifer/Tarandus
* Taurus Poniatovii
* Telescopium Herschelii
* Testudo
* Tigris
* Triangulum Minus
* Turdus Solitarius
* Vespa
* Vultur cadens
* Vultur volans

* obsolete constellation names

* Apis
* Phoenicopterus
* Serpentarius
* Xiphias

* v
* t
* e

Constellations introduced by Nicolas-Louis de Lacaille after 1756

* Antlia
* Caelum
* Circinus
* Fornax
* Horologium
* Mensa
* Microscopium
* Norma
* Octans
* Pictor
* Pyxis
* Reticulum
* Sculptor
* Telescopium

Coordinates:  03h 00m 00s, −60° 00′ 00″

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Original source: https://en.wikipedia.org/wiki/Horologium (constellation). Read more

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