Gamma Andromedae information

γ¹ Andromedae
(γ Andromedae A)
	Location of γ Andromedae (circled)
Observation data; Epoch J2000.0 Equinox J2000.0 (ICRS)
Constellation	Andromeda
Right ascension	02h 03m 53.95229s
Declination	+42° 19′ 47.0223″
Apparent magnitude (V)	2.27
Characteristics
Evolutionary stage	Candidate post-AGB
Spectral type	K2+IIb
U−B color index	+1.58
B−V color index	+1.37
R−I color index	+0.68
Astrometry
Radial velocity (Rv)	−11.7±0.9 km/s
Proper motion (μ)	RA: 42.32 mas/yr ; Dec.: −49.30 mas/yr
Parallax (π)	8.30 ± 1.04 mas
Distance	approx. 390 ly ; (approx. 120 pc)
Details
Radius	97 R☉
Luminosity	2,000 L☉
Surface gravity (log g)	1.03 cgs
Temperature	4,248 K
Metallicity [Fe/H]	−0.06 dex
Rotational velocity (v sin i)	< 17 km/s
Orbit
Primary	γ1 Andromedae
Companion	γ2 Andromedae
Period (P)	4,748 yr
Other designations
	Almach, Almaach, Almak, Almaak, Alamak, γ1 And, Gamma1 Andromedae, Gamma1 And, γ Andromedae A, γ And A, Gamma Andromedae A, Gamma And A, 57 Andromedae A, 57 And A, BD+41 395, FK5 73, GC 2477, HD 12533, HIP 9640, HR 603, SAO 37734, PPM 44721, ADS 1630 A, CCDM J02039+4220A, WDS 02039+4220A
Database references
SIMBAD	data

Gamma Andromedae, Latinized from γ Andromedae, is the third-brightest point of light in the northern constellation of Andromeda. It is a multiple star system approximately 350 light-years from Earth. The system is drifting closer to the Sun with a radial velocity in the range of −12 to −14 km/s.^[5]

^ ^a ^b ^c ^d ^e van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600.
^ ^a ^b ^c ^d ^e ^f Hoffleit, Dorrit; Jaschek, Carlos (1991). The Bright star catalogue. Bibcode:1991bsc..book.....H. "database entry". CDS. Retrieved 2019-11-19.
^ ^a ^b Rao, S. Sumangala; Giridhar, Sunetra; Lambert, David L. (January 2012). "Chemical composition of a sample of candidate post-asymptotic giant branch stars". Monthly Notices of the Royal Astronomical Society. 419 (2): 1254–1270. Bibcode:2012MNRAS.419.1254R. doi:10.1111/j.1365-2966.2011.19780.x.
^ Keenan, Philip C.; McNeil, Raymond C. (1989), "The Perkins catalog of revised MK types for the cooler stars", Astrophysical Journal Supplement Series, 71: 245, Bibcode:1989ApJS...71..245K, doi:10.1086/191373, S2CID 123149047.
^ ^a ^b Wilson, Ralph Elmer (1953). "General catalogue of stellar radial velocities". Carnegie Institute Washington D.C. Publication. Bibcode:1953GCRV..C......0W.
^ Cruzalèbes, P.; Petrov, R. G.; Robbe-Dubois, S.; Varga, J.; Burtscher, L.; Allouche, F.; Berio, P.; Hofmann, K. -H.; Hron, J.; Jaffe, W.; Lagarde, S.; Lopez, B.; Matter, A.; Meilland, A.; Meisenheimer, K. (2019-12-01). "A catalogue of stellar diameters and fluxes for mid-infrared interferometry". Monthly Notices of the Royal Astronomical Society. 490: 3158–3176. arXiv:1910.00542. doi:10.1093/mnras/stz2803. ISSN 0035-8711.
^ Jim Kaler. "Almach". Stars. Retrieved 2019-11-19.
^ ^a ^b Luck, R. Earle (2014-06-01). "Parameters and Abundances in Luminous Stars". The Astronomical Journal. 147: 137. doi:10.1088/0004-6256/147/6/137. ISSN 0004-6256.
^ Tokovinin, A. A. "HIP 9640". Multiple Star Catalogue. Archived from the original on 2020-10-02. Retrieved 2019-11-19.
^ "* gam01 And". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved August 19, 2008.
^ Cite error: The named reference wds0 was invoked but never defined (see the help page).

[vanLeeuwen2007-1] van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600.

[bsc1-2] ^ ^a ^b ^c ^d ^e ^f Hoffleit, Dorrit; Jaschek, Carlos (1991). The Bright star catalogue. Bibcode:1991bsc..book.....H. "database entry". CDS. Retrieved 2019-11-19.

[Rao_et_al_2012-3] Rao, S. Sumangala; Giridhar, Sunetra; Lambert, David L. (January 2012). "Chemical composition of a sample of candidate post-asymptotic giant branch stars". Monthly Notices of the Royal Astronomical Society. 419 (2): 1254–1270. Bibcode:2012MNRAS.419.1254R. doi:10.1111/j.1365-2966.2011.19780.x.

[perkins1989-4] Keenan, Philip C.; McNeil, Raymond C. (1989), "The Perkins catalog of revised MK types for the cooler stars", Astrophysical Journal Supplement Series, 71: 245, Bibcode:1989ApJS...71..245K, doi:10.1086/191373, S2CID 123149047.

[rv-5] Wilson, Ralph Elmer (1953). "General catalogue of stellar radial velocities". Carnegie Institute Washington D.C. Publication. Bibcode:1953GCRV..C......0W.

[cruzalebes-6] Cruzalèbes, P.; Petrov, R. G.; Robbe-Dubois, S.; Varga, J.; Burtscher, L.; Allouche, F.; Berio, P.; Hofmann, K. -H.; Hron, J.; Jaffe, W.; Lagarde, S.; Lopez, B.; Matter, A.; Meilland, A.; Meisenheimer, K. (2019-12-01). "A catalogue of stellar diameters and fluxes for mid-infrared interferometry". Monthly Notices of the Royal Astronomical Society. 490: 3158–3176. arXiv:1910.00542. doi:10.1093/mnras/stz2803. ISSN 0035-8711.

[kaler-7] Jim Kaler. "Almach". Stars. Retrieved 2019-11-19.

[luck2014-8] Luck, R. Earle (2014-06-01). "Parameters and Abundances in Luminous Stars". The Astronomical Journal. 147: 137. doi:10.1088/0004-6256/147/6/137. ISSN 0004-6256.

[orb1-9] Tokovinin, A. A. "HIP 9640". Multiple Star Catalogue. Archived from the original on 2020-10-02. Retrieved 2019-11-19.

[sb0-10] "* gam01 And". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved August 19, 2008.

[wds0-11] Cite error: The named reference wds0 was invoked but never defined (see the help page).

Observation data Epoch J2000.0 Equinox J2000.0 (ICRS)
Location of γ Andromedae (circled)
Constellation	Andromeda
Right ascension	02^h 03^m 53.95229^s^[1]
Declination	+42° 19′ 47.0223″^[1]
Apparent magnitude (V)	2.27^[2]
Characteristics
Evolutionary stage	Candidate post-AGB^[3]
Spectral type	K2+IIb^[4]
U−B color index	+1.58^[2]
B−V color index	+1.37^[2]
R−I color index	+0.68^[2]
Astrometry

Radial velocity (R_v)	−11.7±0.9^[5] km/s
Proper motion (μ)	RA: 42.32^[1] mas/yr Dec.: −49.30^[1] mas/yr
Parallax (π)	8.30 ± 1.04 mas^[1]
Distance	approx. 390 ly (approx. 120 pc)

Details

Radius	97^[6] `R`_☉
Luminosity	2,000^[7] `L`_☉
Surface gravity (log g)	1.03^[8] cgs
Temperature	4,248^[8] K
Metallicity [Fe/H]	−0.06^[3] dex
Rotational velocity (v sin i)	< 17^[2] km/s

Orbit^[9]
Primary	γ¹ Andromedae
Companion	γ² Andromedae
Period (P)	4,748 yr
Other designations
Almach, Almaach, Almak, Almaak, Alamak, γ¹ And, Gamma¹ Andromedae, Gamma¹ And, γ Andromedae A, γ And A, Gamma Andromedae A, Gamma And A, 57 Andromedae A, 57 And A, BD+41 395, FK5 73, GC 2477, HD 12533, HIP 9640, HR 603, SAO 37734, PPM 44721, ADS 1630 A, CCDM J02039+4220A, WDS 02039+4220A^[2]^[10]^[11]
Database references
SIMBAD	data

Gamma Andromedae information

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