Contents

SDSS J090745.0+024507

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]

• List of star extremes
• S5-HVS1 – another fast moving star
• US 708 – another fast moving star

• Gualandris, Alessia; Portegies Zwart, Simon & Sipior, Michael S. (2005), "Three-body encounters in the Galactic Centre: the origin of the hypervelocity star SDSS J090745.0+024507", Monthly Notices of the Royal Astronomical Society, 363 (1): 223–228, arXiv:astro-ph/0507365, Bibcode:2005MNRAS.363..223G, doi:10.1111/j.1365-2966.2005.09433.x, S2CID 15437038
• Brown, Warren R.; Geller, Margaret J.; Kenyon, Scott J. & Kurtz, Michael J. (2006), "A Successful Targeted Search for Hypervelocity Stars", Astrophysical Journal, 640 (1): L35–L38, arXiv:astro-ph/0601580, Bibcode:2006ApJ...640L..35B, doi:10.1086/503279, S2CID 17220212
• Fuentes, Cesar I.; Stanek, K. Z.; Gaudi, B. Scott; et al. (2006), "The Hypervelocity Star SDSS J090745.0+024507 Is Variable", Astrophysical Journal, 636 (1): L37–L40, arXiv:astro-ph/0507520, Bibcode:2006ApJ...636L..37F, doi:10.1086/499233, S2CID 14266685
• Bromley, Benjamin C.; Kenyon, Scott J.; Geller, Margaret J.; et al. (2006), "Hypervelocity Stars: Predicting the Spectrum of Ejection Velocities", Astrophysical Journal, 653 (2): 1194–1202, arXiv:astro-ph/0608159, Bibcode:2006ApJ...653.1194B, doi:10.1086/508419, S2CID 16202860

• Press release
• First Stellar Outcast Speeding at Over 1.5 Million Miles Per Hour (PhysOrg.com)