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]
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]