2MASS J16281370-2431391 is a star located in the constellation Ophiuchus at a distance of about 407 light years from Earth [1] . The star is located in the star-forming region of Ro Ophiuchus .
| 2MASS J16281370-2431391 | |||
|---|---|---|---|
| Star | |||
 Protoplanetary disk surrounding 2MASS J16281370-2431391. | |||
| Observational data ( Age J2000.0 ) | |||
| Right ascension | |||
| Declination | |||
| Distance | 407 St. years (125 pc ) [1] | ||
| Constellation | Ophiuchus | ||
| Astrometry | |||
| Own movement (μ) | RA: Dec: | ||
| physical characteristics | |||
| Temperature | |||
| |||
| Database Information | |||
| SIMBAD | data | ||
| Sources: [3] | |||
Content
- 1 Features
- 2 See also
- 3 notes
- 4 References
Features
2MASS J16281370-2431391 is a binary star including the red dwarf 2MASS J18082002-5104378 B, 13.5 billion years old (the oldest discovered star in the Milky Way galaxy). The young companion is surrounded by a protoplanetary disk , i.e. a disk made up of gas and dust in which planets form. It is located to us with an edge, and therefore, due to its shape, has received the nickname "Flying Saucer" from the astronomers. Observations with the ALMA and IRAM telescopes showed that the dust temperature in it is much lower than expected: −266 degrees Celsius [5] (7 K ). Usually, dust grains in protoplanetary disks have a temperature of 15–20 Kelvin , i.e. a few degrees higher than the Flying Saucer. Perhaps this will force a review of the existing model of protoplanetary disk formation. It is curious that, according to one of the researchers, Stephane Guilloteau, against the background of the dark sky this disk could not be observed. We see it thanks to the Rh Ophiuchus nebula, which highlights it. Thus, the shadow of the protoplanetary disk covers the Earth.
See also
- Ophiuchus constellation star list
Notes
- ↑ 1 2 Klaus M. Pontoppidan et al. Deep Spitzer spectroscopy of the `Flying Saucer 'edge-on disk: Large grains beyond 50 AU . Arxiv.org (Feb 14, 2007). Date of treatment August 22, 2016.
- ↑ 1 2 3 4 5 6 Levison H. F. The USNO-B Catalog // Astron. J. / J. G. III - IOP Publishing , 2003. - Vol. 125, Iss. 2. - P. 984–993. - ISSN 0004-6256 ; 1538-3881 - doi: 10.1086 / 345888
- ↑ SIMBAD . - 2MASS J16281370-2431391 in the SIMBAD database . Date of treatment August 22, 2016.
- ↑ A significant population of candidate new members of the {rho} Ophiuchi cluster - 2012. - doi: 10.1088 / 0004-637X / 751/1/22
- ↑ S. Guilloteau et al. The shadow of the Flying Saucer: A very low temperature for large dust grains . Arxiv.org (Jan 7, 2016). Date of treatment August 22, 2016.
Links
- Frozen Flying Saucer . ESA Press Release. Date of treatment August 22, 2016.
- Australian astronomers have discovered a star that is 13.5 billion years old . Rambler (November 5, 2018). Date of treatment June 6, 2019.