NO Aurigae

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NO Aurigae
Observation data
Epoch J2000      Equinox J2000
Constellation Auriga
Right ascension 05h 40m 42.05023s
Declination +31° 55′ 14.1920″
Apparent magnitude (V) 6.05 - 6.50[1]
Spectral type M2SIab
U−B color index 2.22
B−V color index 2.12
R−I color index 1.41
Variable type slow irregular variable (LC)
Radial velocity (Rv) 7.21 ± 0.45 km/s
Proper motion (μ) RA: 0.13 ± 0.47 mas/yr
Dec.: -3.65 ± 0.26 mas/yr
Parallax (π) 1.68 ± 0.47 mas
Distance approx. 1,900 ly
(approx. 600 pc)
Mass 4.93[2] M
Radius 135 R
Luminosity 6968-7938[2][3] L
Temperature 3450-3500[2][3] K
Other designations
BD+31° 1049, HD 37536, HIP 26718, HR 1939, SAO 58322.
Database references
Data sources:
Hipparcos Catalogue,
CCDM (2002),
Bright Star Catalogue (5th rev. ed.)

NO Aurigae is an S-type star in the constellation Auriga. It is a slow irregular pulsating variable star of small amplitude, ranging from apparent magnitude 6.05 to 6.50 in 102 days.[1] Located around 1900 light-years distant, it shines with a luminosity approximately 7938 times that of the Sun and has a surface temperature of 3500 K.[3] Alternate calculations give it a temperature of 3450 K, luminosity 6968 times that of the sun and mass of 4.93 solar masses.[2]


  1. ^ a b Otero, Sebastian Alberto (5 September 2012). "NO Aurigae". The International Variable Star Index. American Association of Variable Star Observers. Retrieved 22 July 2015. 
  2. ^ a b c d Hohle, M. M.; Neuhäuser, R.; Schutz, B. F. (April 2010), "Masses and luminosities of O- and B-type stars and red supergiants", Astronomische Nachrichten 331 (4): 349, arXiv:1003.2335, Bibcode:2010AN....331..349H, doi:10.1002/asna.200911355 
  3. ^ a b c McDonald, I.; Zijlstra, A. A.; Boyer, M. L. (2012). "Fundamental Parameters and Infrared Excesses of Hipparcos Stars". Monthly Notices of the Royal Astronomical Society 427 (1): 343–57. arXiv:1208.2037. Bibcode:2012MNRAS.427..343M. doi:10.1111/j.1365-2966.2012.21873.x.