Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Cetus |
Right ascension | 00h 15m 28.11090s[1] |
Declination | −16° 08′ 01.6303″[1] |
Apparent magnitude (V) | 11.483[2] |
Characteristics | |
Spectral type | M3.5V[3] |
Astrometry | |
Radial velocity (Rv) | -26.43 ± 0.1[4] km/s |
Proper motion (μ) | RA: 731.83[1] mas/yr Dec.: -607.73[1] mas/yr |
Parallax (π) | 166.6 ± 0.3 mas[3] |
Distance | 19.58 ± 0.04 ly (6.00 ± 0.01 pc) |
Absolute magnitude (MV) | 12.70 ± 0.01 / 15.12 ± 0.09[3] |
Orbit[3] | |
Period (P) | 4.55726+0.00075 −0.00074 y.[5] |
Semi-major axis (a) | 0.3037 ± 0.0005″ |
Eccentricity (e) | 0.36136+0.00097 −0.00098[5] |
Inclination (i) | 143.93+0.25 −0.24[5]° |
Longitude of the node (Ω) | 62.8 ± 0.4° |
Periastron epoch (T) | JD 2449850.4 ± 0.8 |
Argument of periastron (ω) (secondary) | 166.6 ± 0.5° |
Details[3] | |
GJ 1005 A | |
Mass | 0.179 ± 0.002 M☉ |
Temperature | 3341±224[6] K |
Metallicity [Fe/H] | -0.41[5] dex |
GJ 1005 B | |
Mass | 0.112 ± 0.001 M☉ |
Other designations | |
Database references | |
SIMBAD | data |
ARICNS | A |
B | |
Location of GJ 1005 in the constellation Cetus |
GJ 1005 is a system of two red dwarfs, located in constellation Cetus at 19.6 light-years from Earth.[7] The primary star is a M4V class star while the secondary is a class M7V.[citation needed]
The system was observed with the Hubble Space Telescope in the 1990s with its Fine Guidance Sensor.[7] This data helped determine the mass of each of the components of L722-22/ LHS 1047 / GJ 1005.[7]
References
[edit]- ^ a b c d van Leeuwen, F.; et al. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. S2CID 18759600.
- ^ Koen, C.; Kilkenny, D.; van Wyk, F.; Marang, F. (2010). "UBV(RI)C JHK observations of Hipparcos-selected nearby stars". Monthly Notices of the Royal Astronomical Society. 403 (4): 1949–1968. Bibcode:2010MNRAS.403.1949K. doi:10.1111/j.1365-2966.2009.16182.x.
- ^ a b c d e Benedict, G. F.; Henry, T. J.; Franz, O. G.; McArthur, B. E.; Wasserman, L. H.; Jao, Wei-Chun; Cargile, P. A.; Dieterich, S. B.; Bradley, A. J.; Nelan, E. P.; Whipple, A. L. (2016). "The Solar Neighborhood. XXXVII. The Mass–Luminosity Relation for Main-Sequence M Dwarfs". The Astronomical Journal. 152 (5): 141. arXiv:1608.04775. Bibcode:2016AJ....152..141B. doi:10.3847/0004-6256/152/5/141. S2CID 54029447.
- ^ Nidever, David L.; et al. (2013). "Radial Velocities for 889 Late-Type Stars". The Astrophysical Journal Supplement Series. 141 (2): 503–522. arXiv:astro-ph/0112477. Bibcode:2002ApJS..141..503N. doi:10.1086/340570. S2CID 51814894.
- ^ a b c d Mann, Andrew W.; Dupuy, Trent; Kraus, Adam L.; Gaidos, Eric; Ansdell, Megan; Ireland, Michael; Rizzuto, Aaron C.; Hung, Chao-Ling; Dittmann, Jason; Factor, Samuel; Feiden, Gregory; Martinez, Raquel A.; Ruíz-Rodríguez, Dary; Chia Thao, Pa (2019), "How to Constrain Your M Dwarf. II. The Mass–Luminosity–Metallicity Relation from 0.075 to 0.70 Solar Masses", The Astrophysical Journal, 871 (1): 63, arXiv:1811.06938, Bibcode:2019ApJ...871...63M, doi:10.3847/1538-4357/aaf3bc, S2CID 119372932
- ^ Costa-Almeida, Ellen; De Mello, Gustavo F Porto; Giribaldi, Riano E.; Lorenzo-Oliveira, Diego; Ubaldo-Melo, Maria L. (2021), "M dwarf spectral indices at moderate resolution: Accurate Teff and [Fe/H] for 178 southern stars", Monthly Notices of the Royal Astronomical Society, 508 (4): 5148–5162, arXiv:2110.01658, doi:10.1093/mnras/stab2831
- ^ a b c Hershey, John L.; Taff, L. G. (1998-01-01). "Hubble Space Telescope Fine Guidance Sensor Astrometry of the Low-Mass Binary L722-22". The Astronomical Journal. 116 (3): 1440. Bibcode:1998AJ....116.1440H. doi:10.1086/300516. ISSN 1538-3881.
Well, that’s interesting to know that Psilotum nudum are known as whisk ferns. Psilotum nudum is the commoner species of the two. While the P. flaccidum is a rare species and is found in the tropical islands. Both the species are usually epiphytic in habit and grow upon tree ferns. These species may also be terrestrial and grow in humus or in the crevices of the rocks.
View the detailed Guide of Psilotum nudum: Detailed Study Of Psilotum Nudum (Whisk Fern), Classification, Anatomy, Reproduction