6 Equulei

6 Equulei
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Equuleus
Right ascension 21h 10m 31.31996s[1]
Declination 10° 02′ 56.1180″[1]
Apparent magnitude (V) 6.07[2]
Characteristics
Evolutionary stage main sequence[3]
Spectral type A2 Vs[3] (A1 Si Sr Cr)[4]
U−B color index +0.04[2]
B−V color index +0.02[2]
Astrometry
Radial velocity (Rv)+6.9[5] km/s
Proper motion (μ) RA: –2.696[1] mas/yr
Dec.: +15.802[1] mas/yr
Parallax (π)8.5862 ± 0.1086 mas[1]
Distance380 ± 5 ly
(116 ± 1 pc)
Absolute magnitude (MV)+0.236[6]
Details
Mass2.59±0.14[3] M☉
Radius1.7[7] R☉
Luminosity70.6+19.4
−15.2[3] L☉
Temperature9,078+169
−165[3] K
Rotational velocity (v sin i)65[3] km/s
Age970[6] Myr
Other designations
γ Equulei D, BD+09°4735, HD 201616, HIP 104538, HR 8098, SAO 126597[8]
Database references
SIMBADdata

6 Equulei is a probable (95% chance) astrometric binary[9] star system in the northern constellation of Equuleus, located 380 light years from the Sun. It is barely visible to the naked eye as a dim, white-hued star with an apparent visual magnitude of 6.07.[2] The system is moving further away from the Earth with a heliocentric radial velocity of +6.9 km/s.[5] It forms a wide optical double with γ Equulei, at an angular separation of 336 arcseconds in 2011.[10]

The visible component is an Ap star[3] with a stellar classification of A2Vs,[3] matching the evolutionary state of an A-type main sequence star while displaying "sharp" absorption lines. It is an estimated 970[6] million years old with a projected rotational velocity of 65 km/s.[3] The star has 2.6[3] times the mass of the Sun and around 1.7[7] times the Sun's radius. It is radiating 71[3] times the luminosity of the Sun from its photosphere at an effective temperature of 9,078 K.[3]

  1. ^ a b c d e Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference clpl4_99 was invoked but never defined (see the help page).
  3. ^ a b c d e f g h i j k l Cite error: The named reference zorec2012 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference aaa498_3_961 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference gcsrv was invoked but never defined (see the help page).
  6. ^ a b c Cite error: The named reference wolframalpha was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference aaa367_521 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Frankowski2007 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference wds2001 was invoked but never defined (see the help page).