SDSS J090745.0+024507
Template:Use dmy dates Template:Short description
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Hydra |
| Right ascension | Template:RA[1] |
| Declination | Template:DEC[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 | Template:Val ly (Template:Val[3] pc) |
| Details | |
| Temperature | 10,500[3] K |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| SDSS J090744.99+024506.8[5] | |
| Database references | |
| SIMBAD | data |
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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]
See also
- List of star extremes
- S5-HVS1 – another fast moving star
- US 708 – another fast moving star
References
Further reading
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