HD 74180
Supergiant star in the constellation Vela / From Wikipedia, the free encyclopedia
Dear Wikiwand AI, let's keep it short by simply answering these key questions:
Can you list the top facts and stats about HD 74180?
Summarize this article for a 10 year old
HD 74180 is a single[11] star in the constellation Vela. It is a yellow-white F-type supergiant with a mean apparent magnitude of +3.81 and a spectral classification F8Ib. Estimates of its distance to Earth vary between 3,200 and 8,300 light-years.
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Vela |
Right ascension | 08h 40m 37.57017s[1] |
Declination | −46° 38′ 55.4770″[1] |
Apparent magnitude (V) | 3.81[2] |
Characteristics | |
Spectral type | F8 Ib[3] |
U−B color index | +0.34[2] |
B−V color index | +0.67[4] |
Variable type | suspected α Cyg[5] |
Astrometry | |
Radial velocity (Rv) | −25.3[6] km/s |
Proper motion (μ) | RA: −6.124[7] mas/yr Dec.: 4.473[7] mas/yr |
Parallax (π) | 0.431 ± 0.101 mas[8] |
Distance | 8250+1960 −1290 ly (2532+600 −397 pc)[8] |
Absolute magnitude (MV) | −6.50[3] |
Details | |
Mass | 12.63[3]–21.4±2.3[9] M☉ |
Radius | 186[3][lower-alpha 1] R☉ |
Luminosity | 34,040[3][lower-alpha 2] L☉ |
Surface gravity (log g) | 1.38[3] cgs |
Temperature | 5,750[3] K |
Metallicity [Fe/H] | 0.56[10] dex |
Rotational velocity (v sin i) | 21.7±6[4] km/s |
Age | 7.4±0.8[9] Myr |
Other designations | |
Database references | |
SIMBAD | data |
b Velorum has been classified as a suspected α Cygni variable star which varies by only 0.06 magnitude. There are possible periods near 53, 80, and 160 days, but the variation is largely irregular.[5] It lies less than a degree from the small open cluster NGC 2645, but is not a member.[3]
Several studies have considered b Velorum to be a highly luminous supergiant or hypergiant with an early F spectral type, for example F2 Ia+,[5] F0 Ia,[12] and F4 I.[13] There were corresponding luminosity estimates of several hundred thousand L☉. A 2015 study used the Barbier-Chalonge-Divan (BCD) system to derive a luminosity of 38,000 L☉ and a cooler less luminous F8 Ib spectral type.[3]