Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Hydra |
Right ascension | 09h 07m 44.9925s [1] |
Declination | +02° 45′ 06.877″ [1] |
Apparent magnitude (V) | 19.84 [2] |
Characteristics | |
Spectral type | B9 V [3] |
Variable type | SPB [3] |
Astrometry | |
Radial velocity (Rv) | +853 ± 12 [4] km/s |
Distance | 230000
ly (71000 [3] pc) |
Details | |
Temperature | 10,500 [3] K |
Other designations | |
Database references | |
SIMBAD | data |
SDSS J090744.99+024506.8 (SDSS 090745.0+024507) is a short-period variable star in the constellation Hydra. It has a Galactic rest-frame radial velocity of 709 km/s. [3]
Its effective temperature is 10,500 K (corresponding to a spectral type of B9) and its age is estimated to be at most 350 million years. It has a heliocentric distance of 71 kpc. It was ejected from the centre of the galaxy less than 100 million years ago, which implies the existence of a population of young stars at the galactic centre less than 100 million years ago. [3]
Christened by the astronomer Warren Brown as the "outcast star", it is the first discovered member of a class of objects named hypervelocity stars. [6] It was discovered in 2005 at the MMT Observatory of the Center for Astrophysics | Harvard & Smithsonian (CfA), by astronomers Warren Brown, Margaret J. Geller, Scott J. Kenyon and Michael J. Kurtz. [4]
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Hydra |
Right ascension | 09h 07m 44.9925s [1] |
Declination | +02° 45′ 06.877″ [1] |
Apparent magnitude (V) | 19.84 [2] |
Characteristics | |
Spectral type | B9 V [3] |
Variable type | SPB [3] |
Astrometry | |
Radial velocity (Rv) | +853 ± 12 [4] km/s |
Distance | 230000
ly (71000 [3] pc) |
Details | |
Temperature | 10,500 [3] K |
Other designations | |
Database references | |
SIMBAD | data |
SDSS J090744.99+024506.8 (SDSS 090745.0+024507) is a short-period variable star in the constellation Hydra. It has a Galactic rest-frame radial velocity of 709 km/s. [3]
Its effective temperature is 10,500 K (corresponding to a spectral type of B9) and its age is estimated to be at most 350 million years. It has a heliocentric distance of 71 kpc. It was ejected from the centre of the galaxy less than 100 million years ago, which implies the existence of a population of young stars at the galactic centre less than 100 million years ago. [3]
Christened by the astronomer Warren Brown as the "outcast star", it is the first discovered member of a class of objects named hypervelocity stars. [6] It was discovered in 2005 at the MMT Observatory of the Center for Astrophysics | Harvard & Smithsonian (CfA), by astronomers Warren Brown, Margaret J. Geller, Scott J. Kenyon and Michael J. Kurtz. [4]