RX Telescopii
RX Telescopii is an irregular variable star in the constellation Telescopium. It has a maximum magnitude of 6.45 and a minimum magnitude 7.47. It is a red supergiant with a spectral type of M3Iab.[2] If placed in our solar system, it's photosphere would engulf the orbit of Jupiter, nearing that of Saturn.[4] It is currently one of the largest stars discovered.
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Telescopium |
| Right ascension | 19h 06m 58.206s[1] |
| Declination | −45° 58′ 13.54″[1] |
| Apparent magnitude (V) | 6.45 - 7.47[2] |
| Characteristics | |
| Evolutionary stage | Red supergiant |
| Spectral type | M3Iab[2] |
| Variable type | LC[3] |
| Astrometry | |
| Proper motion (μ) | RA: 2.279[1] mas/yr Dec.: -6.725[1] mas/yr |
| Parallax (π) | 0.1699 ± 0.0790[1] mas |
| Distance | approx. 19,000 ly (approx. 6,000 pc) |
| Details | |
| Radius | 1,897[4] R☉ |
| Other designations | |
| Database references | |
| SIMBAD | data |
The distance to RX Telescopii is uncertain. It has a Gaia Data Release 2 parallax of 0.1699±0.0790 mas, suggesting a distance around 6,000 parsecs.[1] A more rigorous statistical calculation gives a distance of 4,726+2,371
−1,315 pc.[6] However the Gaia database has an astrometric noise value larger than the parallax itself and about ten times larger than the typical maximum for a reliable parallax.[1]
References
- 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. Gaia DR2 record for this source at VizieR.
- BSJ (11 November 2011). "RX Telescopii". AAVSO Website. American Association of Variable Star Observers. Retrieved 26 June 2014.
- Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S. 1: B/gcvs. Bibcode:2009yCat....102025S.
- Cruzalèbes, P.; Petrov, R. G.; Robbe-Dubois, S.; Varga, J.; Burtscher, L.; Allouche, F.; Berio, P.; Hofmann, K. H.; Hron, J.; Jaffe, W.; Lagarde, S.; Lopez, B.; Matter, A.; Meilland, A.; Meisenheimer, K.; Millour, F.; Schertl, D. (2019). "A catalogue of stellar diameters and fluxes for mid-infrared interferometry". Monthly Notices of the Royal Astronomical Society. 490 (3): 3158–3176. arXiv:1910.00542. Bibcode:2019MNRAS.490.3158C. doi:10.1093/mnras/stz2803.
- "V* RX Tel". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 26 June 2020.
- Bailer-Jones, C. A. L.; Rybizki, J.; Fouesneau, M.; Mantelet, G.; Andrae, R. (2018). "Estimating Distance from Parallaxes. IV. Distances to 1.33 Billion Stars in Gaia Data Release 2". The Astronomical Journal. 156 (2): 58. arXiv:1804.10121. Bibcode:2018AJ....156...58B. doi:10.3847/1538-3881/aacb21.