Upsilon1 Cancri
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Cancer |
| Right ascension | 08h 31m 30.519s |
| Declination | +24° 04′ 51.99″ |
| Apparent magnitude (V) | +5.694 |
| Characteristics | |
| Spectral type | F0 IIIn |
| B−V color index | +0.309 |
| Astrometry | |
| Radial velocity (Rv) | +19.0±4.3 km/s |
| Proper motion (μ) | RA: −80.791 mas/yr Dec.: −44.858 mas/yr |
| Parallax (π) | 13.6180±0.0415 mas |
| Distance | 239.5 ± 0.7 ly (73.4 ± 0.2 pc) |
| Absolute magnitude (MV) | +1.29 |
| Details | |
| Mass | 1.47 M☉ |
| Radius | 3.20±0.02 R☉ |
| Luminosity | 25 L☉ |
| Surface gravity (log g) | 3.51 cgs |
| Temperature | 7,240±246 K |
| Rotational velocity (v sin i) | 109.2 km/s |
| Age | 570 Myr |
| Other designations | |
| υ1 Cnc, 30 Cancri, BD+24°1940, FK5 2666, HD 72041, HIP 41816, HR 3355, SAO 80229 | |
| Database references | |
| SIMBAD | data |
Upsilon1 Cancri is a solitary, yellow-white-hued star in the constellation Cancer. Its name is a Bayer designation that is Latinized from υ1 Cancri, and abbreviated Upsilon1 Cnc or υ1 Cnc. This star is faintly visible to the naked eye, having an apparent visual magnitude of +5.7. Based upon an annual parallax shift of 13.62 mas as seen from Earth, this system is 240 light-years (73 pc) distant from the Sun. It is drifting further away with a line of sight velocity of +19 km/s.
This object has a stellar classification of F0 IIIn, presenting as an F-type giant star. The 'n' suffix indicates "nebulous" absorption lines due to rapid rotation, and it shows a relatively high projected rotational velocity of 109.2 km/s. It is a variable star of unknown type that changes brightness with an amplitude of 0.05 magnitude. The star is about 570 million years old and is spinning rapidly with a projected rotational velocity of 109.2 km/s. It has an estimated mass of 1.47 times that of the Sun and 3.2 times the Sun's radius. On average, it is radiating 25 times the Sun's luminosity from its photosphere at an effective temperature of 7,240 K.