Gaia DR3 2893941099963718528
Blue straggler star in Canis Major
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Gaia DR3 2893941099963718528 is a blue straggler star in the constellation of Canis Major.[5][3] The star is located in the open cluster NGC 2243, and is approximately 11,900 light years (3,650 parsecs) away.[3][4] It has an apparent magnitude of 15.6.[5] It was first discovered in August 2018 in the second data release of the Gaia Telescope.[6][7][8]
 | ||
| Observation data Epoch J2000.0 Equinox ICRS | ||
|---|---|---|
| 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 | ||
| Radial velocity (Rv) | 64.97±0.03[3] km/s | |
| 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) | |
| Orbit[3] | ||
| Period (P) | 0.235±0.07 d | |
| Semi-major axis (a) | 1.94±0.05 R☉ | |
| Eccentricity (e) | 0.03 | |
| Inclination (i) | 21.08±4.49° | |
| Periastron epoch (T) | 2453008.31±0.01 | |
| Argument of periastron (ω) (secondary) | 37.21±14.22° | |
| Semi-amplitude (K1) (primary) | 4.79±0.05 km/s | |
| Details | ||
| A | ||
| 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 | |
| B | ||
| Mass | 0.056±0.011[3] M☉ | |
| Radius | 0.08±0.13[3] R☉ | |
| Surface gravity (log g) | 4.91 - 5.37 [3] cgs | |
| Temperature | 1100 - 2500[3] K | |
| Other designations | ||
| Gaia DR3 2893941099963718528, Gaia DR2 2893941099963718528 | ||
| Database references | ||
| SIMBAD | data | |
Stellar characteristics
Gaia DR3 2893941099963718528 is a 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 companions
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]