Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Sagittarius |
Right ascension | 18h 07m 11.35s [1] |
Declination | −21° 26′ 38.2″ [1] |
Apparent magnitude (V) | +6.33 [2] |
Characteristics | |
Spectral type | B1/2Ib [3] |
U−B color index | −0.72 [2] |
B−V color index | +0.12 [2] |
Astrometry | |
Radial velocity (Rv) | -8.50 [4] km/s |
Proper motion (μ) |
RA: −0.23
[1]
mas/
yr Dec.: −1.15 [1] mas/ yr |
Parallax (π) | 1.39 ± 0.49 mas [1] |
Distance | approx. 2,300
ly (approx. 700 pc) |
Absolute magnitude (MV) | −5.8 [5] |
Details | |
Mass | 10.1 [6] M☉ |
Radius | 26 [7] R☉ |
Temperature | 25,000 [8] K |
Rotational velocity (v sin i) | 55 [9] km/s |
Age | 22.5 [6] Myr |
Other designations | |
Database references | |
SIMBAD | data |
HD 165516 is a blue supergiant star in the constellation Sagittarius. It is part of the Sagittarius OB1 association and appears against a rich Milky Way starfield near the Triffid Nebula and Lagoon Nebula.
HD 165516 is close to a small reflection and emission nebula, and an associated loose open cluster. The nebula is catalogued as GN 18.05.6, [10] but was first listed as VdB 113. [11] That name has since been used for the cluster itself, which is likely more distant than HD 165516. The whole cluster is less than a quarter of a degree across, with dozens of members from 8th magnitude downwards. V4381 Sagittarii is listed as a probable member, while HD 165516 and the nearby Wolf-Rayet star WR 111 are considered unlikely to be members. [12]
Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Sagittarius |
Right ascension | 18h 07m 11.35s [1] |
Declination | −21° 26′ 38.2″ [1] |
Apparent magnitude (V) | +6.33 [2] |
Characteristics | |
Spectral type | B1/2Ib [3] |
U−B color index | −0.72 [2] |
B−V color index | +0.12 [2] |
Astrometry | |
Radial velocity (Rv) | -8.50 [4] km/s |
Proper motion (μ) |
RA: −0.23
[1]
mas/
yr Dec.: −1.15 [1] mas/ yr |
Parallax (π) | 1.39 ± 0.49 mas [1] |
Distance | approx. 2,300
ly (approx. 700 pc) |
Absolute magnitude (MV) | −5.8 [5] |
Details | |
Mass | 10.1 [6] M☉ |
Radius | 26 [7] R☉ |
Temperature | 25,000 [8] K |
Rotational velocity (v sin i) | 55 [9] km/s |
Age | 22.5 [6] Myr |
Other designations | |
Database references | |
SIMBAD | data |
HD 165516 is a blue supergiant star in the constellation Sagittarius. It is part of the Sagittarius OB1 association and appears against a rich Milky Way starfield near the Triffid Nebula and Lagoon Nebula.
HD 165516 is close to a small reflection and emission nebula, and an associated loose open cluster. The nebula is catalogued as GN 18.05.6, [10] but was first listed as VdB 113. [11] That name has since been used for the cluster itself, which is likely more distant than HD 165516. The whole cluster is less than a quarter of a degree across, with dozens of members from 8th magnitude downwards. V4381 Sagittarii is listed as a probable member, while HD 165516 and the nearby Wolf-Rayet star WR 111 are considered unlikely to be members. [12]