WISE 1828+2650: Difference between revisions
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Revision as of 22:14, 7 September 2012
| Observation data Epoch J2000[1] Equinox J2000[1] | |
|---|---|
| Constellation | Template:Constel |
| Right ascension | 18h 28m 31.08s[1] |
| Declination | 26° 50′ 37.8″[1] |
| Characteristics | |
| Spectral type | ≥Y2[2] |
| Apparent magnitude (J (MKO filter system)) | 23.57 ± 0.35[1] |
| Apparent magnitude (H (MKO filter system)) | 22.85 ± 0.24[1] |
| Astrometry | |
| Proper motion (μ) | RA: 1078 ± 327[1] mas/yr Dec.: 118 ± 409[1] mas/yr |
| Parallax (π) | 122 ± 13 mas[3][2] |
| Distance | approx. 27 ly (approx. 8.2 pc) |
| Details | |
| Temperature | ≤300[4] K |
| Other designations | |
WISE 1828+2650 (full designation is WISEPA J182831.08+265037.8) is the coolest known brown dwarf located in south-west corner of constellation Template:Constel. It is the "archetypal member" of the Y spectral class.[4]
Spectral class
It is one of six Y-type brown dwarfs (along with WISE 0410+1502, WISE 1405+5534, WISE 1541-2250, WISE 1738+2732 and WISE 2056+1459) among 106 brown dwarfs (counting components of two binary systems[5]), discovered in 2011 by the Wide-field Infrared Survey Explorer. With a temperature below 300 K[4], it is currently the coolest known brown dwarf. It has been assigned the latest known spectral class (≥Y2,[2] initially estimated as >Y0[4]) despite the discovery of 8 more Y-type brown dwarf stars in 2012[2].
Distance
Initially (in 2011) photometric distance estimate of this object was <9.4 pc (<30.7 ly).[1] In 2012 was published its trigonometric parallax: 0.122 ± 0.013 arcsecond, corresponding to a distance 8.2+1.0
−0.8 pc, or 26.7+3.2
−2.6 ly.[3][2]
WISE 0410+1502 distance estimates
| Source | Parallax, mas | Distance, pc | Distance, ly | Ref. |
|---|---|---|---|---|
| Kirkpatrick et al., 2011, Table 6 | <9.4 | <30.7 | [1] | |
| Beichman et al., 2012 | 122 ± 13 | 8.2+1.0 −0.8 |
26.7+3.2 −2.6 |
[3][2] |
Non-trigonometric distance estimates are marked in italic.
See also
References
- ^ a b c d e f g h i j k l Kirkpatrick, J. Davy (2011). "The First Hundred Brown Dwarfs Discovered by the Wide-field Infrared Survey Explorer (WISE)". arXiv:1108.4677 [astro-ph.SR].
{{cite arXiv}}: Unknown parameter|accessdate=ignored (help); Unknown parameter|bibcode=ignored (help); Unknown parameter|coauthors=ignored (|author=suggested) (help); Unknown parameter|doi=ignored (help); Unknown parameter|version=ignored (help) - ^ a b c d e f Kirkpatrick, J. Davy (2012). "Further Defining Spectral Type "Y" and Exploring the Low-mass End of the Field Brown Dwarf Mass Function". arXiv:1205.2122 [astro-ph.SR].
{{cite arXiv}}: Unknown parameter|accessdate=ignored (help); Unknown parameter|bibcode=ignored (help); Unknown parameter|coauthors=ignored (|author=suggested) (help); Unknown parameter|version=ignored (help) - ^ a b c Beichman et al., in prep.
- ^ a b c d e Cushing, Michael C. (2011). "The Discovery of Y Dwarfs using Data from the Wide-field Infrared Survey Explorer (WISE)". arXiv:1108.4678 [astro-ph.SR].
{{cite arXiv}}: Unknown parameter|accessdate=ignored (help); Unknown parameter|bibcode=ignored (help); Unknown parameter|coauthors=ignored (|author=suggested) (help); Unknown parameter|doi=ignored (help); Unknown parameter|version=ignored (help) - ^ Gelino (2011). "WISE Brown Dwarf Binaries: The Discovery of a T5+T5 and a T8.5+T9 System". v1. arXiv:1106.3142 [astro-ph.SR]. Bibcode:2011AJ....142...57G. doi:10.1088/0004-6256/142/2/57.
{{cite arXiv}}: Text "Christopher R." ignored (help)
External links
- Choi, Charles Q. (August 26, 2011). "Y dwarf star? Because they're cool, that's Y!". Space.com. Retrieved August 31, 2011.
- NASA news release
- Science news
- Infrared image of WISE 1828+2650 at Astronomy Picture of the Day, 2011 August 30
- Solstation.com (New Objects within 20 light-years)
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