38 Geminorum

38 Geminorum
Observation data
Epoch J2000      Equinox J2000
Constellation Gemini
Right ascension 06h 54m 38.63478s[1]
Declination +13° 10′ 40.2207″[1]
Apparent magnitude (V) 4.75 / 7.80[2]
Characteristics
Spectral type A8V[3] + G6V[4]
U−B color index +0.07[5]
B−V color index +0.30[5]
Variable type Suspected
Astrometry
Radial velocity (Rv)15.90 ± 2.3[6] km/s
Proper motion (μ) RA: 68.48[1] mas/yr
Dec.: -72.98[1] mas/yr
Parallax (π)39.02 ± 1.56[1] mas
Distance84 ± 3 ly
(26 ± 1 pc)
Orbit[2]
Period (P)1898.12 yr
Semi-major axis (a)7.666″
Eccentricity (e)0.000
Inclination (i)130.9°
Longitude of the node (Ω)126.9°
Periastron epoch (T)B 2086.47
Argument of periastron (ω)
(secondary)		349.9°
Details
38 Gem A
Mass1.51[7][note 1] M☉
38 Gem B
Mass0.88[7][note 1] M☉
Other designations
BD+13° 1462, GJ 9220, HD 50635, HIP 33202, HR 2564, SAO 96265
Database references
SIMBADdata

38 Geminorum (38 Gem) is a binary star in the constellation Gemini. Its apparent magnitude is 4.71.

Notes

  1. 1 2 Cvetkovic et al. gives two possible mass sums: 1.51 / 0.88 M☉ or 1.53 / 0.85 M☉.

References

  1. 1 2 3 4 5 van Leeuwen, F.; et al. (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.
  2. 1 2 "Sixth Catalog of Orbits of Visual Binary Stars". United States Naval Observatory. Retrieved 13 August 2017.
  3. ↑ Abt, Helmut A.; Morrell, Nidia I. (1995). "The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars". The Astrophysical Journal Supplement Series. 99: 135. Bibcode:1995ApJS...99..135A. doi:10.1086/192182.
  4. ↑ Favata, F.; Micela, G.; Sciortino, S. (1997). "The [Fe/H] distribution of a volume limited sample of solar-type stars and its implications for galactic chemical evolution". Astronomy and Astrophysics. 323: 809. Bibcode:1997A&A...323..809F.
  5. 1 2 Johnson, H. L. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory. 4: 99. Bibcode:1966CoLPL...4...99J.
  6. ↑ Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065.
  7. 1 2 Cvetkovic, Z.; Ninkovic, S. (2010). "On the Component Masses of Visual Binaries". Serbian Astronomical Journal. 180: 71–80. Bibcode:2010SerAJ.180...71C. doi:10.2298/SAJ1080071C.


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