Elara (moon)

Elara
	Elara imaged by the LORRI instrument aboard New Horizons
Discovery
Discovered by	Charles D. Perrine
Discovery site	Lick Observatory
Discovery date	5 January 1905
Designations
Designation	Jupiter VII
Pronunciation	/ˈɛlərə/
Named after	Ελάρα Elăra
Adjectives	Elarian /ɛˈlɛəriən/
Orbital characteristics
	Epoch 27 April 2019 (JD 2458600.5)
Observation arc	113.70 yr (41,528 days)
Semi-major axis	0.0782306 astronomical unit\|AU (11,703,130 km)
Eccentricity	0.1961487
Orbital period	+258.65 d
Mean anomaly	10.93078°
Mean motion	1° 23m 30.67s / day
Inclination	30.51712° (to ecliptic)
Longitude of ascending node	90.86474°
\|{{{apsis}}}\|helion}}	191.19922°
Satellite of	Jupiter
Group	Himalia group
Physical characteristics
Mean diameter	79.9±1.7 km
Albedo	0.046±0.007
Apparent magnitude	16.6
Absolute magnitude (H)	9.6

Short description: Outer moon of Jupiter

Elara /ˈɛlərə/ is a prograde irregular satellite of Jupiter. It was discovered by Charles Dillon Perrine at Lick Observatory in 1905 in photographs taken with the 36" Crossley reflecting telescope which he had recently rebuilt.^[1]^[8] It is the eighth-largest moon of Jupiter and is named after Elara, one of Zeus's lovers and the mother of the giant Tityos.^[9]

Elara did not receive its present name until 1975; before then, it was simply known as Jupiter VII. It was sometimes called "Hera"^[10] between 1955 and 1975. It has a mean radius of just 43 kilometres (27 mi), thus it is 2% of the size of Europa. However, it is half the size of Himalia, so it is the second-biggest moon in the Himalia group. It might be a captured type C or D asteroid, for it reflects very little light.

Elara belongs to the Himalia group, moons orbiting between 11 and 13 gigametres from Jupiter at an inclination of about 27.5°.^[11] Its orbital elements are as of January 2000. They are continuously changing due to solar and planetary perturbations.

Discovery

Elara was discovered by Charles Dillon Perrine of the Lick Observatory on January 6, 1905, the day after the discovery of Himalia, also by Perrine, was announced. However, poor weather conditions delayed the confirmation of the discovery till the 21st of February.^[12]

Exploration

New Horizons encounter

In February and March 2007, the New Horizons spacecraft to Pluto captured Elara in several LORRI images from a distance of five million miles.^[13]

References

↑ ^1.0 ^1.1 Perrine, C. D. (27 February 1905). "Satellites of Jupiter". Harvard College Observatory Bulletin 178. http://adsabs.harvard.edu//full/seri/BHarO/0178//0000001.000.html.
↑ Perrine, C. D. (1905). "The Seventh Satellite of Jupiter". Publications of the Astronomical Society of the Pacific 17 (101): 62–63. doi:10.1086/121624. Bibcode: 1905PASP...17...56..
↑ DGE en línea
↑ James Knowles (1851) A Critical Pronouncing Dictionary of the English Language
↑ ^5.0 ^5.1 "M.P.C. 115889". Minor Planet Circular. Minor Planet Center. 27 August 2019. https://minorplanetcenter.net/iau/ECS/MPCArchive/2019/MPC_20190827.pdf.
↑ ^6.0 ^6.1 Grav, T.Expression error: Unrecognized word "etal". (August 2015). "NEOWISE: Observations of the Irregular Satellites of Jupiter and Saturn". The Astrophysical Journal 809 (1): 9. doi:10.1088/0004-637X/809/1/3. 3. Bibcode: 2015ApJ...809....3G.
↑ Sheppard, Scott. "Scott S. Sheppard - Jupiter Moons". Department of Terrestrial Magnetism. Carnegie Institution for Science. https://sites.google.com/carnegiescience.edu/sheppard/moons/jupitermoons.
↑ Perrine, C. D. (1905). "The Seventh Satellite of Jupiter". Publications of the Astronomical Society of the Pacific 17 (101): 62–63. doi:10.1086/121624. Bibcode: 1905PASP...17...56..
↑ Marsden, Brian G. (7 October 1975). "Satellites of Jupiter". International Astronomical Union. http://www.cbat.eps.harvard.edu/iauc/02800/02846.html.
↑ Payne-Gaposchkin, Cecilia; Katherine Haramundanis (1970). Introduction to Astronomy. Englewood Cliffs, N.J.: Prentice-Hall. ISBN 0-13-478107-4.
↑ Jacobson, R. A. (2000). "The orbits of outer Jovian satellites". Astronomical Journal 120 (5): 2679–2686. doi:10.1086/316817. Bibcode: 2000AJ....120.2679J. https://trs.jpl.nasa.gov/bitstream/2014/15175/1/00-1187.pdf.
↑ Proctor, Mary (March 5, 1905). "Jupiter's Newly Discovered Moons and Solar Cyclones". https://www.newspapers.com/clip/110687001/elara-discovery/. Retrieved October 4, 2022.
↑ Hamilton, Thomas Wm. (2013). Moons of the solar system. Strategic Book Publishing. p. 21. ISBN 978-1625161758. https://books.google.com/books?id=wg4ELSuruqQC&pg=PA21.

External links

Elara on 1998-08-15 03:21 UTC(Crédit: OHP/IMCCE/CNRS)
SkyView 23 47 09 -02 40 46
HORIZONS Web-Interface, JPL
Elara: Overview by NASA's Solar System Exploration
David Jewitt pages
"Two Irregular Satellites of Jupiter" (Himalia & Elara: Remanzacco Observatory: November 23, 2012)

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Original source: https://en.wikipedia.org/wiki/Elara (moon). Read more

[Harvard1905-1] 1.0 ^1.1 Perrine, C. D. (27 February 1905). "Satellites of Jupiter". Harvard College Observatory Bulletin 178. http://adsabs.harvard.edu//full/seri/BHarO/0178//0000001.000.html.

[Perrine1905-2] Perrine, C. D. (1905). "The Seventh Satellite of Jupiter". Publications of the Astronomical Society of the Pacific 17 (101): 62–63. doi:10.1086/121624. Bibcode: 1905PASP...17...56..

[3] DGE en línea

[4] James Knowles (1851) A Critical Pronouncing Dictionary of the English Language

[MPC115889-5] 5.0 ^5.1 "M.P.C. 115889". Minor Planet Circular. Minor Planet Center. 27 August 2019. https://minorplanetcenter.net/iau/ECS/MPCArchive/2019/MPC_20190827.pdf.

[Grav2015-6] 6.0 ^6.1 Grav, T.Expression error: Unrecognized word "etal". (August 2015). "NEOWISE: Observations of the Irregular Satellites of Jupiter and Saturn". The Astrophysical Journal 809 (1): 9. doi:10.1088/0004-637X/809/1/3. 3. Bibcode: 2015ApJ...809....3G.

[SheppardMoons-7] Sheppard, Scott. "Scott S. Sheppard - Jupiter Moons". Department of Terrestrial Magnetism. Carnegie Institution for Science. https://sites.google.com/carnegiescience.edu/sheppard/moons/jupitermoons.

[Perrine_1905-8] Perrine, C. D. (1905). "The Seventh Satellite of Jupiter". Publications of the Astronomical Society of the Pacific 17 (101): 62–63. doi:10.1086/121624. Bibcode: 1905PASP...17...56..

[IAUC_2846-9] Marsden, Brian G. (7 October 1975). "Satellites of Jupiter". International Astronomical Union. http://www.cbat.eps.harvard.edu/iauc/02800/02846.html.

[Gaposchkin-10] Payne-Gaposchkin, Cecilia; Katherine Haramundanis (1970). Introduction to Astronomy. Englewood Cliffs, N.J.: Prentice-Hall. ISBN 0-13-478107-4.

[Jacobson_2000-11] Jacobson, R. A. (2000). "The orbits of outer Jovian satellites". Astronomical Journal 120 (5): 2679–2686. doi:10.1086/316817. Bibcode: 2000AJ....120.2679J. https://trs.jpl.nasa.gov/bitstream/2014/15175/1/00-1187.pdf.

[12] Proctor, Mary (March 5, 1905). "Jupiter's Newly Discovered Moons and Solar Cyclones". https://www.newspapers.com/clip/110687001/elara-discovery/. Retrieved October 4, 2022.

[13] Hamilton, Thomas Wm. (2013). Moons of the solar system. Strategic Book Publishing. p. 21. ISBN 978-1625161758. https://books.google.com/books?id=wg4ELSuruqQC&pg=PA21.

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v t e Moons of Jupiter
Listed in approximately increasing distance from Jupiter. Provisional designations in italics.
Inner moons	Metis Adrastea Amalthea Thebe
Galilean moons	Io Europa Ganymede Callisto
Themisto group	Themisto
Himalia group	Leda Himalia Ersa Pandia Lysithea Elara Dia
Carpo group	Carpo
Valetudo group	Valetudo
Ananke group	S/2003 J 12(?) Euporie Eupheme Jupiter LV Jupiter LII Thelxinoe Euanthe Helike Orthosie Jupiter LXVIII Jupiter LIV Jupiter LXIV Iocaste S/2003 J 16(?) Praxidike Harpalyke Mneme Hermippe Thyone Jupiter LXX Ananke
Carme group	Jupiter LXXII Herse Aitne Kale Taygete Jupiter LXI Chaldene S/2003 J 10(?) Erinome Kallichore Jupiter LXVI Jupiter LXIX Kalyke Carme Jupiter LXIII Pasithee Jupiter LI Eukelade Arche Isonoe S/2003 J 9(?) Eirene
Pasiphae group	Jupiter LXVII Philophrosyne S/2003 J 23(?) Aoede Callirrhoe Eurydome Kore Cyllene Jupiter LVI Jupiter LIX S/2003 J 4(?) Pasiphae Hegemone Sinope Sponde Autonoe Megaclite S/2003 J 2(?)
Rings of Jupiter In fiction

Elara (moon)

Topic: Astronomy

Contents

Discovery

Exploration

New Horizons encounter

See also

References

External links