RX Telescopii
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| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Telescopium |
| Right ascension | 19h 06m 58.206s[2] |
| Declination | −45° 58′ 13.54″[2] |
| Apparent magnitude (V) | 6.45 - 7.47[3] |
| Characteristics | |
| Evolutionary stage | Red supergiant |
| Spectral type | M3Iab[3] |
| Variable type | LC[4] |
| Astrometry | |
| Radial velocity (Rv) | 19.87±0.64[5] km/s |
| Proper motion (μ) | RA: 2.285±0.092[5] mas/yr Dec.: -6.520[5] mas/yr |
| Parallax (π) | 0.4914 ± 0.0810 mas[5] |
| Distance | 7136+1783 −1245 ly (2189+547 −382 pc)[6] |
| Details | |
| Radius | 872[a]; 322[2] R☉ |
| Temperature | 3,758[2] K |
| Other designations | |
| Database references | |
| SIMBAD | data |
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, indicating the star is an intermediate-size luminous supergiant star.[3]
The distance to RX Telescopii is uncertain. It has a Gaia Data Release 2 parallax of 0.1699±0.0790 mas,[9] suggesting a distance around 6,000 parsecs.[9] A more rigorous statistical calculation gives a distance of 4,726+2,371
−1,315 pc,[10] suggesting a radius of 1,882 R☉ using an angular diameter of 3.704 mas,[7] which would make it one of the largest stars discovered and its photosphere engulf the orbit of Jupiter, and nearing that of Saturn if it was placed in the Solar System. 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, thus this distance, hence the radius, are inaccurate.[9] Bailer-Jones et al. (2021) publised a photogeometric distance of 2189+547
−382 pc for RX Telescopii, corresponding to a smaller radius of 872 R☉ using the angular diameter.[6] Gaia DR3 published a much smaller radius of 322 R☉ for this star, together with a much smaller distance of 845+25
−28 pc.[2]
Notes[edit]
- ^ From an angular diameter of 3.704 milliarcseconds [7] and a distance of 2,189 parsecs.[6]
References[edit]
- ^ "ASAS All Star Catalogue". The All Sky Automated Survey. Retrieved 8 December 2021.
- ^ 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.
- ^ a b c 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.
- ^ a b c d Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
- ^ a b c Bailer-Jones, C. A. L.; Rybizki, J.; Fouesneau, M.; Demleitner, M.; Andrae, R. (2021-03-01). "Estimating distances from parallaxes. V: Geometric and photogeometric distances to 1.47 billion stars in Gaia Early Data Release 3". The Astronomical Journal. 161 (3): 147. arXiv:2012.05220. Bibcode:2021AJ....161..147B. doi:10.3847/1538-3881/abd806. ISSN 0004-6256. Data about this star can be seen here.
- ^ a b 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. S2CID 203610229.
- ^ "V* RX Tel". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 26 June 2020.
- ^ a b c 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.
- ^ 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. S2CID 119289017.
