Upsilon Octantis

Short description: Star in the constellation of Octans

υ Octantis

Location of υ Octantis (circled)

Observation data
Epoch J2000.0 Equinox (celestial coordinates)
Constellation | Octans
Right ascension |  22h 31m 37.5152s[1]
Declination | −85° 58′ 02.1104″[1]
Apparent magnitude (V) | 5.75±0.01[2]
Characteristics
Spectral type | K0 III[3]
U−B color index | +0.88[4]
B−V color index | +1.02[4]
Astrometry
Radial velocity (Rv)| 19±7.8[5] km/s
Proper motion (μ)|  RA: −37.556[1] mas/yr
Dec.: +61.431[1] mas/yr
Parallax (π)| 9.5042 ± 0.0351[1] mas
Distance| 343 ± 1 ly
(105.2 ± 0.4 pc)
Absolute magnitude (MV)| +0.77[6]
Details[7]
Mass| 2.12±0.07 M☉
Radius| 10.3±0.2 R☉
Luminosity| 56±1.1 L☉
Surface gravity (log g)| 2.7±0.1 cgs
Temperature| 4,910±42 K
Metallicity [Fe/H]| 0.00±0.03 dex
Rotational velocity (v sin i)| 1.5±1.3[8] km/s
Other designations

υ Oct, CPD−86°406, FK5 1670, GC 31327, HD 211539, HIP 111196, HR 8505, SAO 258932[9]

Database references
SIMBAD| data

Upsilon Octantis (Upsilon Oct), Latinized from υ Octantis, is a solitary star[10] in the southern circumpolar constellation Octans. It is faintly visible to the naked eye with an apparent magnitude of 5.75[2] and is located 343 light years away from the Solar System.[1] However, it is receding with a heliocentric radial velocity of 19 km/s.[5]

Upsilon Oct has a stellar classification of K0 III,[3] indicating that it is a red giant. At present it has 2.12 times the mass of the Sun but has expanded to 10.3 times its girth.[7] It shines with a luminosity of 56 L☉ from its enlarged photosphere at an effective temperature of 4,910 K,[7] giving a yellowish orange hue when viewed at night. Upsilon Oct has a solar metallicity, with an iron abundance equivalent to the Sun's.[7] It spins leisurely with a poorly-constrained projected rotational velocity of 1.5 km/s.[8]

## References

1. ↑ 1.0 1.1 1.2 1.3 1.4 Brown, A. G. A. (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics 649: A1. doi:10.1051/0004-6361/202039657. Bibcode: 2021A&A...649A...1G. Gaia EDR3 record for this source at VizieR.
2. ↑ 2.0 2.1 Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P. et al. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics 355: L27–L30. ISSN 0004-6361. Bibcode: 2000A&A...355L..27H.
3. ↑ 3.0 3.1 Houk, N.; Cowley, A. P. (1975). University of Michigan Catalogue of two-dimensional spectral types for the HD stars. Volume I. Declinations -90_ to -53_ƒ0.. Bibcode: 1975mcts.book.....H.
4. ↑ 4.0 4.1 Johnson, H. L.; Mitchell, R. I.; Iriarte, B.; Wisniewski, W. Z. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory 4: 99–110. Bibcode: 1966CoLPL...4...99J.
5. ↑ 5.0 5.1 Kharchenko, N.V.; Scholz, R.-D.; Piskunov, A.E.; Röser, S.; Schilbach, E. (November 2007). "Astrophysical supplements to the ASCC-2.5: Ia. Radial velocities of ~55000 stars and mean radial velocities of 516 Galactic open clusters and associations". Astronomische Nachrichten 328 (9): 889–896. doi:10.1002/asna.200710776. ISSN 0004-6337. Bibcode: 2007AN....328..889K.
6. ↑ Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation" (in en). Astronomy Letters 38 (5): 331–346. doi:10.1134/S1063773712050015. ISSN 1063-7737. Bibcode: 2012AstL...38..331A.
7. ↑ 7.0 7.1 7.2 7.3 Ottoni, G.; Udry, S.; Ségransan, D.; Buldgen, G.; Lovis, C.; Eggenberger, P.; Pezzotti, C.; Adibekyan, V. et al. (January 2022). "CORALIE radial-velocity search for companions around evolved stars (CASCADES): I. Sample definition and first results: Three new planets orbiting giant stars". Astronomy & Astrophysics 657: A87. doi:10.1051/0004-6361/202040078. ISSN 0004-6361. Bibcode: 2022A&A...657A..87O.
8. ↑ 8.0 8.1 De Medeiros, J. R.; Alves, S.; Udry, S.; Andersen, J.; Nordström, B.; Mayor, M. (January 2014). "A catalog of rotational and radial velocities for evolved stars: V. Southern stars⋆⋆⋆". Astronomy & Astrophysics 561: A126. doi:10.1051/0004-6361/201220762. ISSN 0004-6361. Bibcode: 2014A&A...561A.126D.
9. ↑ "ups Oct". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=ups+Oct.
10. ↑ Eggleton, P. P.; Tokovinin, A. A. (11 September 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. ISSN 0035-8711. Bibcode: 2008MNRAS.389..869E.

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* v
* t
* e

Constellation of Octans

* List of stars in Octans
* Octans in Chinese astronomy

Stars|

| Bayer|

* α
* β
* γ1
* γ2
* γ3
* δ
* ε
* ζ
* η
* θ
* ι
* κ
* λ
* μ1
* μ2
* ν
* ξ
* ο
* π1
* π2
* ρ
* σ (Polaris Australis)
* τ
* υ
* φ
* χ
* ψ
* ω
* B

|

Variable|

* R
* RV
* UV
* AO
* BP
* BQ
* CC
* CF
* CK
* CW
* DR

HR|

* 47
* 512
* 525
* 1271
* 2848
* 4507
* 4595
* 4709
* 6552
* 6837
* 6912
* 6994
* 7494
* 7698
* 7785
* 7812
* 8129
* 8176
* 8201
* 8234
* 8370
* 8380
* 8432
* 8526
* 8577
* 8786
* 8810
* 8849
* 8935
* 8957
* 8995

HD|

* 142022
* 165338
* 172226
* 212301

Other|

* EUVE J0317-85.5
* Gliese 877
* TYC 9486-927-1

| Exoplanets|

* HD 142022 Ab
* HD 212301 b

|

Galaxies|

| NGC|

* 7095
* 7098

|

Other|

* PGC 10922

Category

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