Tau2 Serpentis

For other stars with this Bayer designation, see Tau Serpentis.
τ2 Serpentis
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Serpens
Right ascension 15h 32m 09.67495s[1]
Declination +16° 03′ 22.2056″[1]
Apparent magnitude (V) 6.22[2]
Characteristics
Spectral type B9V[3]
U−B color index −0.23[4]
B−V color index −0.038±0.005[2]
Astrometry
Radial velocity (Rv)−19.3±2.7[2] km/s
Proper motion (μ) RA: −2.92[5] mas/yr
Dec.: +6.48[5] mas/yr
Parallax (π)6.7936 ± 0.0928 mas[1]
Distance480 ± 7 ly
(147 ± 2 pc)
Absolute magnitude (MV)+0.44[2]
Details
Mass2.89±0.08[6] M☉
Radius2.7[7] R☉
Luminosity96.4+15.3
−12.6[6] L☉
Temperature10,839+60
−50[6] K
Rotational velocity (v sin i)154[6] km/s
Age278[8] Myr
Other designations
τ2 Ser, 12 Serpentis, BD+16°2797, GC 20880, HD 138527, HIP 76069, HR 5770, SAO 101600, PPM 131484[9]
Database references
SIMBADdata

Tau2 Serpentis, Latinized from τ2 Serpentis, is a star in the constellation of Serpens, located approximately 480 light-years from the Sun.[1] It is a challenge to view with the naked eye, having an apparent visual magnitude of 6.22.[2] The star is drifting closer with a radial velocity of −19 km/s.[2]

This object is a late B-type main-sequence star with a stellar classification of B9V.[3] It is a probable Lambda Boötis star.[2][10] The star is 278[8] million years old and is spinning with a projected rotational velocity of 154 km/s.[6] It has nearly three times the mass and radius of the Sun.[6][7] Tau2 Serpentis is radiating 96[6] times the Sun's luminosity from its photosphere at an effective temperature of 10,839 K.[6]

There is evidence of a possible companion, which is contributing about 15% to the total emission of the system.[11]

  1. ^ a b c d Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ a b c d e f g Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Cowley1969 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference bsc1 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  6. ^ a b c d e f g h Cite error: The named reference zorec2012 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference cadars2 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference Gontcharov2012 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Murphy2015 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Zverko2013 was invoked but never defined (see the help page).