HD 168625
Star in the constellation Sagittarius / 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 168625?
Summarize this article for a 10 year old
SHOW ALL QUESTIONS
HD 168625 (V4030 Sagittarii) is a blue hypergiant star and candidate luminous blue variable located in the constellation of Sagittarius easy to see with amateur telescopes. It forms a visual pair with the also blue hypergiant (and luminous blue variable) HD 168607 and is located to the south-east of M17, the Omega Nebula.
Quick Facts Observation data Epoch J2000 Equinox J2000, Constellation ...
HD 168625 is the left star of the pair below the Omega Nebula. The other is the hypergiant HD 168607. | |
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Sagittarius |
Right ascension | 18h 21m 19.548s[1] |
Declination | −16° 22′ 16.0572″[1] |
Apparent magnitude (V) | 8.30–8.41[2] |
Characteristics | |
Spectral type | B6Ia+[3] (B2—B8[4]) May be B60 due to hypergiant designation |
U−B color index | +0.37[5] |
B−V color index | +1.41[5] |
J−K color index | 0.599 |
Variable type | α Cygni[6] |
Astrometry | |
Radial velocity (Rv) | −4.00[7] km/s |
Proper motion (μ) | RA: −0.71±1.20[1] mas/yr Dec.: +0.01±0.74[1] mas/yr |
Parallax (π) | 0.6212 ± 0.0640 mas[8] |
Distance | approx. 5,300 ly (approx. 1,600 pc) |
Absolute magnitude (MV) | −8.39[4] |
Details[4] | |
Radius | 105 R☉ |
Luminosity | 380,000 L☉ |
Surface gravity (log g) | 1.74 cgs |
Temperature | 14,000 K |
Rotational velocity (v sin i) | 60 km/s |
Other designations | |
Database references | |
SIMBAD | data |
Close