Upsilon Geminorum

Evolved red giant star in the constellation Gemini

Not to be confused with U Geminorum.

υ Geminorum  Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)

Constellation | Gemini
Right ascension | 07h 35m 55.35001s[1]
Declination | +26° 53′ 44.6802″[1]
Apparent magnitude (V) | 4.04[2] (4.04 - 4.08[3])
Characteristics
Spectral type | M0 III[4]
U−B color index | +1.96[2]
B−V color index | +1.54[2]
Variable type | suspected[3]
Astrometry
Radial velocity (Rv)| −21.61±0.19[5] km/s
Proper motion (μ)|  RA: −32.841 mas/yr[1]
Dec.: −106.002 mas/yr[1]
Parallax (π)| 12.8761±0.2288 mas[1]
Distance| 253 ± 5 ly
(78 ± 1 pc)
Absolute magnitude (MV)| −0.53[6]
Details
Mass| 1.52[7] M☉
Radius| 39.62+0.74
−0.76[8] R☉
Luminosity| 369.6±18.5[8] L☉
Surface gravity (log g)| 1.0[5] cgs
Temperature| 4,019±38[8] K
Metallicity [Fe/H]| 0.17[7] dex
Rotational velocity (v sin i)| 5.9[5] km/s
Age| 3.53[7] Gyr
Other designations
υ Gem, 69 Geminorum, BD+27°1424, FK5 1196, HD 60522, HIP 36962, HR 2905, SAO 79533.[9]
Database references
SIMBAD| data

Upsilon Geminorum, Latinized from υ Geminorum, is a star in the constellation Gemini. It has an apparent visual magnitude of 4.04,[2] which is bright enough to be seen with the naked eye. Based upon an annual parallax shift of 12.88 mas,[1] it is around 253 light years from the Sun. There is a visual companion: a magnitude 13.20 star located at an angular separation of 55.20″ along a position angle of 40°, as of 2008.[10]

This is an evolved red giant star with a stellar classification of M0 III.[4] It is estimated to have 1.52[7] times the mass of the Sun, but has expanded to 40[8] times the Sun's radius. The star is spinning with a projected rotational velocity of 5.9 km/s[5] and is about 3.53[7] billion years old. Upsilon Geminorum is radiating 370 times the solar luminosity from its outer atmosphere at an effective temperature of 4,019 K.[8]

Based upon the motion of this star through space, Upsilon Geminorum is a member of the Wolf 630 moving group. This is a set of stars centered on Wolf 630 that are moving nearly in parallel and have an age of around 2.7±0.5 billion years. They may be former members of a dissolved open cluster.[11]

## References

[edit]

1. ^ a b c d e Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
2. ^ a b c d Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data, SIMBAD, Bibcode:1986EgUBV........0M.
3. ^ a b Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S. 1. Bibcode:2009yCat....102025S.
4. ^ a b Morgan, W. W.; Keenan, P. C. (1973), "Spectral Classification", Annual Review of Astronomy and Astrophysics, 11: 29, Bibcode:1973ARA&A..11...29M, doi:10.1146/annurev.aa.11.090173.000333.
5. ^ a b c d Massarotti, Alessandro; et al. (January 2008), "Rotational and Radial Velocities for a Sample of 761 HIPPARCOS Giants and the Role of Binarity", The Astronomical Journal, 135 (1): 209–231, Bibcode:2008AJ....135..209M, doi:10.1088/0004-6256/135/1/209.
6. ^ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID 119257644.
7. ^ a b c d e Luck, R. Earle (September 2015), "Abundances in the Local Region. I. G and K Giants", The Astronomical Journal, 150 (3): 23, arXiv:1507.01466, Bibcode:2015AJ....150...88L, doi:10.1088/0004-6256/150/3/88, S2CID 118505114, 88.
8. ^ a b c d e Baines, Ellyn K.; Thomas Armstrong, J.; Clark, James H.; Gorney, Jim; Hutter, Donald J.; Jorgensen, Anders M.; Kyte, Casey; Mozurkewich, David; Nisley, Ishara; Sanborn, Jason; Schmitt, Henrique R.; Van Belle, Gerard T. (2021). "Angular Diameters and Fundamental Parameters of Forty-four Stars from the Navy Precision Optical Interferometer". The Astronomical Journal. 162 (5): 198. arXiv:2211.09030. Bibcode:2021AJ....162..198B. doi:10.3847/1538-3881/ac2431.
9. ^ "ups Gem". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2016-12-08.`{{cite web}}`: CS1 maint: postscript (link)
10. ^ Mason, B. D.; et al. (2014), "The Washington Visual Double Star Catalog", The Astronomical Journal, 122 (6): 3466–3471, Bibcode:2001AJ....122.3466M, doi:10.1086/323920.
11. ^ Bubar, Eric J.; King, Jeremy R. (August 2010), "Spectroscopic Abundances and Membership in the Wolf 630 Moving Group", The Astronomical Journal, 140 (2): 293–318, arXiv:1005.1205, Bibcode:2010AJ....140..293B, doi:10.1088/0004-6256/140/2/293, S2CID 118455341.

## External links

[edit]

* Kaler, James B. (March 2, 2012), "Upsilon Geminorum", Stars, University of Illinois, retrieved 2016-12-08.

* v
* t
* e

Constellation of Gemini

* List of stars in Gemini
* Gemini in Chinese astronomy

Stars|

| Bayer|

* α (Castor)
* β (Pollux)
* γ (Alhena)
* δ (Wasat)
* ε (Mebsuta)
* ζ (Mekbuda)
* η (Propus)
* θ
* ι
* κ
* λ
* μ (Tejat)
* ν
* ξ (Alzirr)
* ο (Jishui)
* π
* ρ
* σ
* τ
* υ
* φ
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|

Flamsteed|

* 1
* 3
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* 25
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* 37
* 38 (e)
* 57 (A)
* 64 (b1)
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* 74 (f)
* 81 (g)

Variable|

* R
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* V429

HR|

* 2877

HD|

* 44780
* 50554
* 63433
* 260655

Other|

* 2MASS 0727+1710
* CXOU J061705.3+222127
* Geminga
* Gliese 251
* HAT-P-20
* HAT-P-24
* HAT-P-33
* LB-1
* PSR J0659+1414
* WD J0651+2844
* WISEP J060738.65+242953.4

| Exoplanets|

* HAT-P-24b
* HAT-P-50b
* HD 50554 b
* HD 59686 Ab
* Pollux b
* τ Geminorum b

|

Star
clusters|

| NGC|

* 2129
* 2158
* 2266
* 2277
* 2355
* 2420

|

Other|

* Koposov 2
* Messier 35

| Nebulae|

* IC 443
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|

Galaxies|

| NGC|

* 2291
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* 2357

|

Other|

* 4C 25.21
* B2 0648+27
* IC 485
* PKS 0735+178
* QSO B0738+313

| Astronomical events|

* GRB 070125

|

Category
*[RA:]: Right Ascension
*[Dec.:]: Declination
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