Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Aries |
Right ascension | 02h 43m 51.24421s[1] |
Declination | +25° 38′ 18.0493″[1] |
Apparent magnitude (V) | 6.376[2] |
Characteristics | |
Spectral type | A3 V[3] |
B−V color index | 0.089±0.002[4] |
Astrometry | |
Radial velocity (Rv) | −10.3±3.1[5] km/s |
Proper motion (μ) | RA: −4.98±0.70[1] mas/yr Dec.: +6.04±0.52[1] mas/yr |
Parallax (π) | 9.59 ± 0.76 mas[1] |
Distance | 340 ± 30 ly (104 ± 8 pc) |
Absolute magnitude (MV) | +1.18±0.13[2] |
Details | |
HD 16955 A | |
Mass | 2.25±0.08[6] M☉ |
Luminosity | 26.9+3.3 −2.9[2] L☉ |
Temperature | 8,450±164[2] K |
Rotational velocity (v sin i) | 175[7] km/s |
Other designations | |
Database references | |
SIMBAD | data |
HD 16955, also known as HR 803, is a double or multiple star. With an apparent visual magnitude of 6.376,[2] is lies at or below the nominal limit for visibility with a typical naked eye. The measured annual parallax shift is 9.59 milliarcseconds, which yields an estimated distance of around 340 light years. The star is moving closer to the Sun with a heliocentric radial velocity of around -10 km/s.[5]
This is an A-type main-sequence star with a stellar classification of A3 V.[3] Hauck et al. (1995) identified this as a Lambda Boötis star with a circumstellar shell,[9] but this now appears to be unlikely.[2] It has 2.25[6] times the mass of the Sun and is spinning rapidly with a projected rotational velocity of 175 km/s.[7] The star is radiating about 27[2] times the Sun's luminosity from its photosphere at an effective temperature of roughly 8,450 K.[2]
HD 16955 has a magnitude 10.36 companion, component B, which is located, as of 2015, at an angular separation of 3.0 arcseconds along a position angle of 19°.[10] This is the likely source for the detected X-ray emission with a luminosity of 262.5×1020 W coming from these coordinates, since A-type stars are not expected to emit X-rays.[11] Component C is a more distant magnitude 12.94 companion located at a separation of 51.10 arcseconds along a position angle of 92°, as of 2015.[10]
vanLeeuwen2007
was invoked but never defined (see the help page).Murphy2017
was invoked but never defined (see the help page).Cowley1969
was invoked but never defined (see the help page).Anderson2012
was invoked but never defined (see the help page).Gontcharov2006
was invoked but never defined (see the help page).zorec2012
was invoked but never defined (see the help page).Royer2007
was invoked but never defined (see the help page).SIMBAD
was invoked but never defined (see the help page).Hauck1995
was invoked but never defined (see the help page).Mason2014
was invoked but never defined (see the help page).Schroeder2007
was invoked but never defined (see the help page).