51 Ophiuchi
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Ophiuchus |
| Right ascension | 17h 31m 24.95413s[1] |
| Declination | −23° 57′ 45.5136″[1] |
| Apparent magnitude (V) | 4.81[2] |
| Characteristics | |
| Spectral type | B9.5IIIe[3] |
| U−B color index | –0.06[2] |
| B−V color index | +0.00[2] |
| Details | |
Myr | |
| Database references | |
| SIMBAD | data |
51 Ophiuchi is a singleapparent visual magnitude of 4.81.[2] The star is moving closer to the Earth with a heliocentric radial velocity of –12 km/s.[4]
This object is notable for being "a rare, nearby example of a young planetary system just entering the last phase of planet formation".
Dust and gas disk
51 Ophiuchi has a disk of dust and gas that appears to be a young
The distance to 51 Ophiuchi is much greater than the distance to
interferometer to resolve, in contrast to that of Beta Pictoris, which has been observed using visual spectrum imaging.[13] Recent observations of 51 Ophiuchi made with the Keck Interferometer Nuller at the W. M. Keck Observatory show that the disk has two components: a central cloud of large particles (exozodiacal dust) surrounded by a much larger cloud of small silicate particles extending to about 1,000 astronomical units.[12] The inner disk has a radius approximately four times the distance between the sun and the Earth, with a density of around 100,000 times that of the dust in the Solar System.[10]
The spectra taken by 2020 have indicated the circumstellar disc is similar in composition to interstellar medium. The dominant species in atomic numbers are hydrogen, helium, oxygen, nitrogen, silicon and iron. Surprisingly, the disk was found to be strongly depleted of carbon and carbon monoxide.[14]
References
- ^ S2CID 18759600
- ^ Bibcode:1966CoLPL...4...99J.
- S2CID 17545474
- ^ Bibcode:1967IAUS...30...57E
- ^ S2CID 6213084. A81.
- ^ S2CID 15059920
- ^
- ^ S2CID 15321298.
- ^ "c Oph". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-06-22.
- ^ a b c "Twin Keck telescopes probe dual dust disks", e! Science News, September 24, 2009, retrieved 2009-10-01
- doi:10.1086/512056
- ^ S2CID 17938884
- S2CID 120412113
- S2CID 216056466.
