Lambda Geminorum

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Lambda Geminorum
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Gemini
Right ascension 07h 18m 05.57977s[1]
Declination +16° 32′ 25.3905″[1]
Apparent magnitude (V) 3.571[2]
Characteristics
Spectral type A3V[3]
U−B color index +0.167[2]
B−V color index +0.113[2]
Astrometry
Radial velocity (Rv) –7.40[4] km/s
Proper motion (μ) RA: –44.43[1] mas/yr
Dec.: –36.61[1] mas/yr
Parallax (π) 32.33 ± 0.20[1] mas
Distance 100.9 ± 0.6 ly
(30.9 ± 0.2 pc)
Details
Mass 2.098[3] M
Radius 2.7773 ± 0.0469[3] R
Luminosity 27.3901 ± 0.3416[3] L
Temperature 7,932 ± 62[3] K
Rotational velocity (v sin i) 154[5] km/s
Age 0.8[3] Gyr
Other designations
54 Geminorum, BD+16 1443, FK5 277, HD 56537, HR 2763, HIP 35350, NSV 3512, SAO 96746.[6]

Lambda Geminorum (λ Gem, λ Geminorum) is a class A3, fourth-magnitude star in the constellation Gemini. Lambda Geminorum is a variable star located about 95 light-years from Earth. It has 2.8 times the radius of the Sun and is radiating 27 times the Sun's luminosity. It has 2.1 times the mass of the Sun and is around 800 million years old.[3]

References[edit]

  1. ^ a b c d e van Leeuwen, F. (November 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. ^ a b c Gutierrez-Moreno, Adelina et al. (1966), A System of photometric standards 1, Publicaciones Universidad de Chile, Department de Astronomy, pp. 1–17, Bibcode:1966PDAUC...1....1G. 
  3. ^ a b c d e f g Boyajian, Tabetha S. et al. (July 2013), "Stellar Diameters and Temperatures. III. Main-sequence A, F, G, and K Stars: Additional High-precision Measurements and Empirical Relations", The Astrophysical Journal 771 (1): 40, arXiv:1306.2974, Bibcode:2013ApJ...771...40B, doi:10.1088/0004-637X/771/1/40. 
  4. ^ Gontcharov, G. A. (November 2006), "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system", Astronomy Letters 32 (11): 759–771, Bibcode:2006AstL...32..759G, doi:10.1134/S1063773706110065. 
  5. ^ Royer, F. et al. (February 2007), "Rotational velocities of A-type stars. III. Velocity distributions", Astronomy and Astrophysics 463 (2): 671–682, arXiv:astro-ph/0610785, Bibcode:2007A&A...463..671R, doi:10.1051/0004-6361:20065224. 
  6. ^ "HD 56537 -- Variable Star", SIMBAD Astronomical Database (Centre de Données astronomiques de Strasbourg), retrieved 2006-12-09