Nu Fornacis
Bluish variable star in the constellation Fornax From Wikipedia, the free encyclopedia
Nu Fornacis, Latinized from ν Fornacis, is a single,[13] variable star in the southern constellation of Fornax. It is blue-white in hue and faintly visible to the naked eye with an apparent visual magnitude that fluctuates around 4.69.[3] This body is located approximately 370 light years distant from the Sun based on parallax,[2] and is drifting further away with a radial velocity of +18.5 km/s.[7] It is a candidate member of the Pisces-Eridanus stellar stream, which suggests an age of 120 million years or less.[14]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Fornax |
| Right ascension | 02h 04m 29.43861s[2] |
| Declination | −29° 17′ 48.5477″[2] |
| Apparent magnitude (V) | 4.69[3] (4.68 – 4.73[4]) |
| Characteristics | |
| Spectral type | B9.5IIIspSi[5] |
| U−B color index | −0.51[3] |
| B−V color index | −0.17[3] |
| Variable type | α2 CVn[6] |
| Astrometry | |
| Radial velocity (Rv) | +18.50[7] km/s |
| Proper motion (μ) | RA: +12.79[8] mas/yr Dec.: +8.48[8] mas/yr |
| Parallax (π) | 8.79 ± 0.26 mas[2] |
| Distance | 370 ± 10 ly (114 ± 3 pc) |
| Absolute magnitude (MV) | −0.60[9] |
| Details | |
| Mass | 3.65±0.18[10] M☉ |
| Radius | 3.44[11] R☉ |
| Luminosity | 245[10] L☉ |
| Temperature | 13,400[12] K |
| Rotation | 1.89[12] d |
| Rotational velocity (v sin i) | 50±5[12] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
This object is an Ap star[15] with a stellar classification of B9.5IIIspSi[5] matching a late B-type giant star. The 'Si' suffix indicates an abundance anomaly of silicon. It is an Alpha2 Canum Venaticorum variable that ranges from magnitude 4.68 down to 4.73 with a period of 1.89 days – the same as its rotational period.[6][12] It is 3.65 times as massive and 245 times as luminous as the Sun,[10] with 3.44 times the Sun's diameter.[11]
References
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