HR 3407
Star in the constellation Vela
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HR 3407 is a single[11] star in the southern constellation of Vela. It has the Bayer designation C Velorum; HR 3407 is the designation in the Bright Star Catalogue.[10] It is an orange-hued star that is dimly visible to the naked eye with an apparent visual magnitude of 5.01.[3] The distance to this object is approximately 1,040 light years based on parallax measurements, and it is drifting further away with a radial velocity of 4 km/s.[2]
| Observation data Epoch J2000 Equinox ICRS | |
|---|---|
| Constellation | Vela[1] |
| Right ascension | 08h 34m 43.59703s[2] |
| Declination | −49° 56′ 39.1359″[2] |
| Apparent magnitude (V) | 5.01[3] |
| Characteristics | |
| Evolutionary stage | Giant star[4] |
| Spectral type | K1.5Ib[5] |
| U−B color index | +1.38[3] |
| B−V color index | +1.33[3] |
| Variable type | microvariable[6] |
| Astrometry | |
| Radial velocity (Rv) | 4.25±0.17[2] km/s |
| Proper motion (μ) | RA: −14.236±0.322[2] mas/yr Dec.: +18.540±0.353[2] mas/yr |
| Parallax (π) | 3.1501±0.1571 mas[2] |
| Distance | 1,040 ± 50 ly (320 ± 20 pc) |
| Absolute magnitude (MV) | –2.06[7] |
| Details | |
| Mass | 3.3±1.1[4] M☉ |
| Radius | 56[8] R☉ |
| Luminosity | 1,010±131[4] L☉ |
| Surface gravity (log g) | 2.0[9] cgs |
| Temperature | 4,245[4] K |
| Metallicity [Fe/H] | −0.4[9] dex |
| Rotational velocity (v sin i) | 4.1[9] km/s |
| Other designations | |
| C Vel, CD−49°3646, FK5 2674, HD 73155, HIP 42088, HR 3407, SAO 220138[10] | |
| Database references | |
| SIMBAD | data |
This star has stellar classification of K1.5Ib,[5] which would suggest it is a supergiant, but is actually a giant star according to modern studies.[4] It has about three times the mass of the Sun[4] and has expanded to around 56 times the Sun's radius.[8] The latter is equivalent to 0.26 AU. It is spinning with a projected rotational velocity of 4.1.[9] The star displays microvariability with a period of 10.99 cycles per day and an amplitude of 0.0036 in magnitude.[6] It is radiating around 1,010 times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 4,245 K.[4]