NML Cygni
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Star NML Cygni |
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| AladinLite | |||||
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Observation dates equinox : J2000.0 , epoch : J2000.0 |
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| Constellation | swan | ||||
| Right ascension | 20 h 46 m 25.54 s | ||||
| declination | + 40 ° 06 ′ 59.4 ″ | ||||
| Apparent brightness | 16.6 mag | ||||
| Typing | |||||
| B − V color index | (2.04) | ||||
| Spectral class | M7-8 | ||||
| Variable star type | Yes | ||||
| Astrometry | |||||
| parallax | 1.53 ± 0.57 mas | ||||
| distance | 1610 pc | ||||
| Proper movement | |||||
| Rec. Share: | (−0.27 ± 1.12) mas / a | ||||
| Dec. portion: | (−0.86 ± 1.18) mas / a | ||||
| Physical Properties | |||||
| Dimensions | 25-40 or 50 M ☉ | ||||
| Luminosity |
2.7 ± 0.5 or 5 * 10 5 L ☉ |
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| Effective temperature | 2500/3250 K | ||||
| Age | 2-3 mill. A | ||||
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Other names and catalog entries |
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NML Cygni or V1489 Cygni is a red hypergiant located in the constellation Swan . NML Cygni is one of the largest known stars . It is believed that he belongs to the Cyg-OB2 association .
size
For the radio photosphere, astrometric measurements determined a diameter of 44 mas ( milli-angle seconds ). A radius of 3700 solar radii has been calculated for a specific model of the star .
Surname
The first part of the name NML goes to the discoverer N eugebauer , M artz and L Eighton back who discovered him 1965th The second part of the name Cygni corresponds to the genitive of the name of the constellation Swan : Cygnus .
See also
Individual evidence
- ↑ a b c d e f g NML Cyg. In: SIMBAD . Center de Données astronomiques de Strasbourg , accessed October 29, 2018 .
- ↑ a b c d e f Zhang et al .: "The distance and size of the red hypergiant NML Cygni from VLBA and VLA astrometry" ; Astronomy & Astrophysics, Vol. 544 (2012)
- ↑ a b c d Zubko et al .: Observations of Water Vapor Outflow from NML Cygnus ; The Astrophysical Journal, Vol. 610 (1), pp. 427-435 (2004), bibcode : 2004ApJ ... 610..427Z
- ↑ Michael Thomas Schuster: Investigating the Circumstellar Environments of the Cool Hypergiants, ProQuest, 2007 p. 58
- ↑ JAM Bleeker, Johannes Geiss, M. Huber: The Century of Space Science, Springer, 2001, pp. 304/305 "immortalized the three authors' names [..] through the designations NML"