HD 166

HD 166

A light curve for V439 Andromedae, plotted from TESS data,[1] with the 6.23 day rotation period shown in red,
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Andromeda
Right ascension 00h 06m 36.7841s[2]
Declination +29° 01′ 17.4103″[2]
Apparent magnitude (V) 6.13 – 6.17[3]
Characteristics
Spectral type K0Ve[3][4]
U−B color index +0.30[5]
B−V color index +0.755[5]
Variable type BY Dra[3]
Astrometry
Radial velocity (Rv)−6.9±0.2[4] km/s
Proper motion (μ) RA: 380.092±0.060[2] mas/yr
Dec.: −177.573±0.037[2] mas/yr
Parallax (π)72.5764 ± 0.0498 mas[2]
Distance44.94 ± 0.03 ly
(13.779 ± 0.009 pc)
Absolute magnitude (MV)5.41[6]
Details
Mass0.889[7] M☉
Radius0.9172±0.0090[7] R☉
Luminosity0.6078±0.0099[7] L☉
Surface gravity (log g)4.49±0.09[8] cgs
Temperature5509±34[8] K
Metallicity [Fe/H]0.00±0.03[8] dex
Rotation6.23±0.01 days[9]
Rotational velocity (v sin i)4.1 [9] km/s
Age78±28[8] Myr
Other designations
BD+28°4704, GC 95, GSC 01735-02532, GSC 01735-00927, Gliese 5, HD 166, HIP 544, HR 8, SAO 73743, PPM 89410, NSV 33, V439 Andromedae
Database references
SIMBADdata

HD 166 or V439 Andromedae (ADS 69 A) is a 6th magnitude star in the constellation Andromeda, approximately 45 light years away from Earth. It is a variable star of the BY Draconis type, varying between magnitudes 6.13 and 6.18 with a 6.23 days periodicity.[3] It appears within one degree of the star Alpha Andromedae[10] and is a member of the Hercules-Lyra association moving group.[4] It also happens to be less than 2 degrees from right ascension 00h 00m.

  1. ^ Cite error: The named reference MAST was invoked but never defined (see the help page).
  2. ^ a b c d e Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  3. ^ a b c d Cite error: The named reference GCVS was invoked but never defined (see the help page).
  4. ^ a b c Cite error: The named reference Lopez2006 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference MERMILLIOD was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Holmberg2009 was invoked but never defined (see the help page).
  7. ^ a b c Cite error: The named reference Boyajian2013 was invoked but never defined (see the help page).
  8. ^ a b c d Cite error: The named reference Rich2017 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference Gaidos2000 was invoked but never defined (see the help page).
  10. ^ Autostar Suite Astronomer Edition. CD-ROM. Meade, April 2006.