85 Geminorum

85 Geminorum
Observation data; Epoch J2000.0 Equinox ICRS
Constellation	Gemini
Right ascension	07h 55m 39.89s
Declination	+19° 53′ 02.3″
Apparent magnitude (V)	5.365±0.009
Characteristics
Evolutionary stage	main-sequence
Spectral type	A0Vs
Astrometry
Radial velocity (Rv)	12.3 km/s
Proper motion (μ)	RA: -15.114 mas/yr ; Dec.: -39.83 mas/yr
Parallax (π)	6.4022±0.1333 mas
Distance	510 ± 10 ly ; (156 ± 3 pc)
Details
Mass	3.29 M☉
Other designations
	85 Gem, BD+20 1946, HD 64648, HIP 38722, HR 3086, SAO 79799, GCRV 5268, 2MASS J07553990+1953024, Gaia DR3 670326064263850624
Database references
SIMBAD	data

85 Geminorum (85 Gem) is an A-type main-sequence star located approximately 510 light-years from Earth in the constellation of Gemini. It is a relatively bright star with an apparent visual magnitude of approximately 5.37, making it visible to the naked eye under dark skies.

Observation

In 2005, 85 Geminorum was observed by NASA Infrared Telescope Facility and has served as an A0V spectrophotometric standard star in infrared spectroscopy to calibrate spectra of M, L, and T dwarf stars.

In a 2022 survey of visual binaries among intermediate-mass stars, 85 Geminorum was included with an estimated mass of approximately 3.29 M_☉, placing it in the A-type stars mass range. Although, no companion stars have been detected.

References

1 2 3 4 5 6 7 "* 85 Gem". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2026-04-14.
1 2 Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H. ISSN 0004-6361.
↑ Cowley, A.; Cowley, C.; Jaschek, M.; Jaschek, C. (1969). "A study of the bright stars. I. A catalogue of spectral classifications". The Astronomical Journal. 74: 375. Bibcode:1969AJ.....74..375C. doi:10.1086/110819.
↑ European Space Agency; Gaia collaboration (2020), Gaia EDR3, Centre de Donnees Strasbourg (CDS), doi:10.26093/CDS/VIZIER.1350, retrieved 2026-04-14
1 2 3 Duchêne, Gaspard; Oon, Jner Tzern; De Rosa, Robert J; Kantorski, Patrick; Coy, Brandon; Wang, Jason J; Thomas, Sandrine; Patience, Jenny; Pueyo, Laurent; Nielsen, Eric L; Konopacky, Quinn (2022-12-16). "A low-mass companion desert among intermediate-mass visual binaries: The scaled-up counterpart to the brown dwarf desert". Monthly Notices of the Royal Astronomical Society. 519 (1): 778–798. doi:10.1093/mnras/stac3527. ISSN 0035-8711.
1 2 Cushing, Michael C.; Rayner, John T.; Vacca, William D. (2005-04-20). "An Infrared Spectroscopic Sequence of M, L, and T Dwarfs". The Astrophysical Journal. 623 (2): 1115–1140. arXiv:astro-ph/0412313. Bibcode:2005ApJ...623.1115C. doi:10.1086/428040. ISSN 0004-637X.

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[:SIMBAD-1] 1 2 3 4 5 6 7 "* 85 Gem". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2026-04-14.

[:E._Høg_et_al_(2000)-2] 1 2 Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H. ISSN 0004-6361.

[3] Cowley, A.; Cowley, C.; Jaschek, M.; Jaschek, C. (1969). "A study of the bright stars. I. A catalogue of spectral classifications". The Astronomical Journal. 74: 375. Bibcode:1969AJ.....74..375C. doi:10.1086/110819.

[4] European Space Agency; Gaia collaboration (2020), Gaia EDR3, Centre de Donnees Strasbourg (CDS), doi:10.26093/CDS/VIZIER.1350, retrieved 2026-04-14

[:Gaspard_Duchêne_et_al_(2022)-5] 1 2 3 Duchêne, Gaspard; Oon, Jner Tzern; De Rosa, Robert J; Kantorski, Patrick; Coy, Brandon; Wang, Jason J; Thomas, Sandrine; Patience, Jenny; Pueyo, Laurent; Nielsen, Eric L; Konopacky, Quinn (2022-12-16). "A low-mass companion desert among intermediate-mass visual binaries: The scaled-up counterpart to the brown dwarf desert". Monthly Notices of the Royal Astronomical Society. 519 (1): 778–798. doi:10.1093/mnras/stac3527. ISSN 0035-8711.

[:Michael_C._Cushing_et_al_(2005)-6] 1 2 Cushing, Michael C.; Rayner, John T.; Vacca, William D. (2005-04-20). "An Infrared Spectroscopic Sequence of M, L, and T Dwarfs". The Astrophysical Journal. 623 (2): 1115–1140. arXiv:astro-ph/0412313. Bibcode:2005ApJ...623.1115C. doi:10.1086/428040. ISSN 0004-637X.