16 Persei
Star in the constellation Perseus
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16 Persei is a single,[12] suspected variable star[6] in the northern constellation of Perseus, located approximately 121 light years away based on parallax.[1] It is visible to the naked eye as a yellow-white hued star with an apparent visual magnitude of 4.22.[2] This object is moving further from the Earth with a heliocentric radial velocity of +14 km/s.[7] It displays a relatively high proper motion, traversing the celestial sphere at the rate of 0.224″ per year.[13]
  | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Perseus |
| Right ascension | 02h 50m 35.05979s[1] |
| Declination | 38° 19′ 07.1080″[1] |
| Apparent magnitude (V) | 4.22[2] |
| Characteristics | |
| Spectral type | F2III[3] |
| U−B color index | +0.08[4] |
| B−V color index | +0.34[4] |
| Variable type | δ Sct(?)[5][6] |
| Astrometry | |
| Radial velocity (Rv) | +14.00[7] km/s |
| Proper motion (μ) | RA: +195.77[1] mas/yr Dec.: −109.98[1] mas/yr |
| Parallax (π) | 27.01±0.19 mas[1] |
| Distance | 120.8 ± 0.8 ly (37.0 ± 0.3 pc) |
| Absolute magnitude (MV) | 1.38[2] |
| Details | |
| Mass | 1.80[8] M☉ |
| Radius | 3.2[9] R☉ |
| Luminosity | 23.36[2] L☉ |
| Surface gravity (log g) | 3.72[10] cgs |
| Temperature | 7,004[10] K |
| Metallicity [Fe/H] | −0.04[2] dex |
| Rotational velocity (v sin i) | 149[3] km/s |
| Age | 1.44[8] Gyr |
| Other designations | |
| 16 Per, NSV 956, BD+37°646, FK5 2194, GC 3401, HD 17584, HIP 13254, HR 840, SAO 55928, CCDM J02506+3818A, LTT 10924[11] | |
| Database references | |
| SIMBAD | data |
Based upon a stellar classification of F2 III,[3] this matches an aging giant star that has exhausted the hydrogen at its core and is evolving away from the main sequence. It is a possible pulsating Delta Scuti variable, although there is some uncertainty about this classification.[6] However, Kunzli and North (1998) found no variation.[15] The star is 1.44[8] billion years old with 1.8[8] times the mass of the Sun and 3.2[9] times the Sun's radius. It shows a high rotation rate with a projected rotational velocity of 149 km/s,[3] which is causing an equatorial bulge that is an estimated 24% larger than the polar radius.[16] 16 Persei is radiating 23[2] times the Sun's luminosity from its photosphere at an effective temperature of 7,004 K.[10]
It has two reported visual companions: B, with a magnitude of 12.8 and separation of 76.7", and C, with magnitude 10.43 and separation 234".[17]