Gaia DR3 2893941099963718528
  | ||
| Observation data Epoch J2000.0 Equinox J2000.0 | ||
|---|---|---|
| Constellation | Canis Major | |
| Right ascension | 06h 29m 31.108s[1] | |
| Declination | −31° 20′ 59.54″[1] | |
| Apparent magnitude (V) | 15.6[2] | |
| Characteristics | ||
| Evolutionary stage | Blue straggler[3] | |
| Spectral type | A3V[4] | |
| Apparent magnitude (G) | 15.09[5] | |
| Astrometry | ||
| Proper motion (μ) | RA: −1.243[1] mas/yr Dec.: +5.480[1] mas/yr | |
| Parallax (π) | 0.2365±0.0207 mas[1] | |
| Distance | 14,000 ± 1,000 ly (4,200 ± 400 pc) | |
| Details | ||
| Mass | 1.72±0.12[3] M☉ | |
| Radius | 1.23±0.22[3] R☉ | |
| Luminosity | 10.59±0.03[3] L☉ | |
| Surface gravity (log g) | 4.49±0.58[3] cgs | |
| Temperature | 8,800±700[3] K | |
| Metallicity [Fe/H] | −0.31±0.15[3] dex | |
| Rotational velocity (v sin i) | 95.63±9.78[3] km/s | |
| Age | 510±70[3] Myr | |
| Other designations | ||
| Gaia DR3 2893941099963718528, Gaia DR2 2893941099963718528 | ||
| Database references | ||
| SIMBAD | data | |
Gaia DR3 2893941099963718528 is a blue straggler star in the constellation of Canis Major.[5][3] The star is located in the open cluster designated NGC 2243, and it is approximately 11,900 light years (or 3,650 parsecs) away.[3][4] It has an apparent G-band magnitude of 15.09.[5] It was first discovered in August 2018 in the second data release of the Gaia Telescope.[6][7][8]
Stellar Characteristics
[edit]Gaia DR3 2893941099963718528 is a luminous, massive blue straggler star in the open cluster NGC 2243.[5][3] The star has an estimated radius of 1.23±0.22 R☉, and a predicted mass of 1.72±0.12 M☉.[3][4] The radius was found using a bolometric luminosity of 10.59±0.03 L☉, and an effective temperature of 8,800±700 K.[3][4] It is believed to be extremely metal-poor with a metallicity of −0.31±0.15 dex.[3][4] It is proposed to be 510±70 million years old.[3][4] The star has a spectral type of A3V.[4] It is a fast rotating star with a rotational velocity of 95.63±9.78 km/s.[3]
Substellar System
[edit]In 2026, a substellar object was discovered orbiting around Gaia DR3 2893941099963718528.[3] It is designated Gaia DR3 2893941099963718528 b and is either a planet or brown dwarf.[3] The substellar object is in a tight, low eccentricity compact orbit around its host star in roughly 5.6 hours.[3][4] The substellar object has a mass between 20 and 70 MJ, implying that it is likely a brown dwarf.[3][4] The substellar object has a radius of 0.8 RJ, and calculated temperature between 1,100 and 2,500 K.[3][4]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (hours) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 20-70 MJ | 0.009 | 5.62 | 0.03±0.01 | 21.08±4.49° | 0.8 RJ |
References
[edit]- ^ a b c d e Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
- ^ Lasker, Barry M.; Lattanzi, Mario G.; McLean, Brian J.; Bucciarelli, Beatrice; Drimmel, Ronald; Garcia, Jorge; Greene, Gretchen; Guglielmetti, Fabrizia; Hanley, Christopher; Hawkins, George; Laidler, Victoria G.; Loomis, Charles; Meakes, Michael; Mignani, Roberto; Morbidelli, Roberto; Morrison, Jane; Pannunzio, Renato; Rosenberg, Amy; Sarasso, Maria; Smart, Richard L.; Spagna, Alessandro; Sturch, Conrad R.; Volpicelli, Antonio; White, Richard L.; Wolfe, David; Zacchei, Andrea (2008). "The Second-Generation Guide Star Catalog: Description and Properties". The Astronomical Journal. 136 (2): 735. arXiv:0807.2522. Bibcode:2008AJ....136..735L. doi:10.1088/0004-6256/136/2/735.
- ^ a b c d e f g h i j k l m n o p q r s t u v w Sheikh, A. H. (2026). "First discovery of a fast-rotating blue straggler in a compact binary with a sub-stellar companion". NASA Ads. 545 (4) staf2130. Bibcode:2026MNRAS.545f2130S. doi:10.1093/mnras/staf2130.
- ^ a b c d e f g h i j k "EPE Results for Gaia DR3 2893941099963718528". Extrasolar Planets Encyclopaedia. Retrieved 2026-01-20.
- ^ a b c d "SIMBAD Results for Gaia DR3 2893941099963718528". SIMBAD. Retrieved 2026-01-20.
- ^ Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051.
- ^ Sheikh, A. H.; Medhi, Biman J. (2024-12-01). "Characterization of the Blue Straggler Star Populations, through Statistical, Photometric, and Spectral Energy Distribution Analysis, in the Old Open Cluster: NGC 2243". The Astronomical Journal. 168 (6): 274. Bibcode:2024AJ....168..274S. doi:10.3847/1538-3881/ad84eb. ISSN 0004-6256.
- ^ Zeng, Dexin; Mei, Ying; Chi, Huanbin; Deng, Hui; Wang, Feng (2025-10-01). "Comprehensive Analysis of NGC 6134: Structure, Dynamics, and Blue Straggler Star Candidates". The Astrophysical Journal Supplement Series. 280 (2): 74. Bibcode:2025ApJS..280...74Z. doi:10.3847/1538-4365/ae0643. ISSN 0067-0049.
