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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]
An editor has nominated this article for deletion. You are welcome to participate in the deletion discussion, which will decide whether or not to retain it. |
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]