6 Equulei

Short description: Star in the constellation Equuleus

6 Equulei  Observation data
Epoch J2000.0 Equinox (celestial coordinates)

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[1] mas
Distance| 380 ± 5 ly
(116 ± 1 pc)
Absolute magnitude (MV)| +0.236[6]
Details
Mass| 2.59±0.14[3] M☉
Radius| 1.7[7] R☉
Luminosity| 70.6+19.4
−15.2[3] L☉
Temperature| 9,078+169
−165[3] K
Rotational velocity (v sin i)| 65[3] km/s
Age| 970[6] Myr
Other designations

γ Equulei D, BD+09°4735, HD 201616, HIP 104538, HR 8098, SAO 126597[8]

Database references
SIMBAD| data

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]

## References

1. ↑ 1.0 1.1 1.2 1.3 1.4 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
2. ↑ 2.0 2.1 2.2 2.3 Johnson, H. L. et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory 4 (99): 99, Bibcode: 1966CoLPL...4...99J
3. ↑ 3.00 3.01 3.02 3.03 3.04 3.05 3.06 3.07 3.08 3.09 3.10 3.11 Zorec, J. et al. (2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy and Astrophysics 537: A120, doi:10.1051/0004-6361/201117691, Bibcode: 2012A&A...537A.120Z.
4. ↑ Renson, P.; Manfroid, J. (May 2009), "Catalogue of Ap, HgMn and Am stars", Astronomy and Astrophysics 498 (3): 961–966, doi:10.1051/0004-6361/200810788, Bibcode: 2009A&A...498..961R.
5. ↑ 5.0 5.1 Wilson, Ralph Elmer (1953), "General Catalogue of Stellar Radial Velocities", Carnegie Institute Washington D.C. Publication (Washington: Carnegie Institution of Washington), Bibcode: 1953GCRV..C......0W.
6. ↑ 6.0 6.1 6.2 "HD 104538", WolframAlpha, http://www.wolframalpha.com/input/?i=6+Equulei, retrieved 2012-08-05
7. ↑ 7.0 7.1 Pasinetti Fracassini, L. E. et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third edition - Comments and statistics", Astronomy and Astrophysics 367 (2): 521–524, doi:10.1051/0004-6361:20000451, Bibcode: 2001A&A...367..521P.
8. ↑ "6 Equ -- Star in double system", SIMBAD Astronomical Database (Centre de Données astronomiques de Strasbourg), http://simbad.u-strasbg.fr/simbad/sim-id?Ident=6+Equulei, retrieved 2012-07-25.
9. ↑ Frankowski, A.; Jancart, S.; Jorissen, A. (March 2007), "Proper-motion binaries in the Hipparcos catalogue. Comparison with radial velocity data", Astronomy and Astrophysics 464 (1): 377–392, doi:10.1051/0004-6361:20065526, Bibcode: 2007A&A...464..377F
10. ↑ Mason, Brian D. et al. (2001), "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog", The Astronomical Journal 122 (6): 3466–3471, doi:10.1086/323920, Bibcode: 2001AJ....122.3466M.

## External links

* frostydrew.org/stars.dc/star/id-126597/pss-obsy
* www.wolframalpha.com/input/?i=6+Equulei

* v
* t
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Constellation of Equuleus

* List of stars in Equuleus

Stars|

| Bayer|

* α (Kitalpha)
* β
* γ
* δ
* ε

|

Flamsteed|

* 2 (λ)
* 3 (ζ)
* 4
* 6
* 9

Variable|

* R
* S
* U
* SY

HR|

* 8038
* 8067
* 8090
* 8095
* 8149
* 8191

HD|

* 200964
* 202908

Other|

* 2MASS J0523−1403
* Gliese 229
* WASP-49
* WASP-61

Galaxies|

| NGC|

* 7015
* 7040
* 7046

|

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