Gliese 412
Gliese 412 atau GJ 412 adalah sebuah sepasang bintang yang memiliki gerak yang hampir sama di ruang angkasa dan dianggap merupakan sistem bintang biner. Pasangan ini memiliki jarak sudut 31,4 pada sudut posisi 126,1°.[14] Bintang-bintang tersebut terletak 15,8 tahun cahaya jauhnya dari Matahari di konstelasi Ursa Major. Kedua komponen bintang tersebut merupakan bintang katai merah yang relatif redup.
| Data pengamatan Epos J2000 Ekuinoks J2000 | |
|---|---|
| Rasi bintang | Ursa Major |
| Gliese 412 A | |
| Asensio rekta | 11j 05m 22.3101d[1] |
| Deklinasi | +43° 31′ 51.0404″[1] |
| Magnitudo semu (V) | 8.68[2] |
| Gliese 412 B | |
| Asensio rekta | 11j 05m 30.8856d[3] |
| Deklinasi | +43° 31′ 17.8843″[3] |
| Magnitudo semu (V) | 14.45[4] |
| Ciri-ciri | |
| Kelas spektrum | M1.0V[2]/M6.0V[4] |
| Indeks warna U−B | +1.16/—[5] |
| Indeks warna B−V | +1.54[5]/2.08[6] |
| Astrometri | |
| Gliese 412 A | |
| Kecepatan radial (Rv) | +64.9 ± 0.9[7] km/s |
| Gerak diri (μ) | RA: −4.410,43±0,78[8] mdb/thn Dek.: 942,93±0,70[8] mdb/thn |
| Paralaks (π) | 206,27±1,00[8] mdb |
| Jarak | 15,81 ± 0,08 tc (4,85 ± 0,02 pc) |
| Magnitudo mutlak (MV) | 10.34[9] |
| Gliese 412 B | |
| Gerak diri (μ) | RA: −4.339,891±0,167 mdb/thn Dec.: 960,780±0,162 mdb/thn |
| Paralaks (π) | 206,27±1,00[3] mdb |
| Jarak | 15,98 ± 0,01 tc (4,901 ± 0,004 pc) |
| Magnitudo mutlak (MV) | 16.05[9] |
| Detail | |
| GJ 412 A | |
| Massa | 0.48[9] M☉ |
| Radius | 0.38[10] R☉ |
| Gravitasi permukaan (log g) | 4.90[11] |
| Suhu | 3,687[11]/ K |
| Metalisitas [Fe/H] | -0.43[11] |
| Kecepatan rotasi (v sin i) | <3[12] km/s |
| Usia | 3[10] gigatahun |
| GJ 412 B | |
| Massa | 0.10[9] M☉ |
| Radius | 0.13[10] R☉ |
| Suhu | 2,700[6] K |
| Metalisitas [Fe/H] | −0.32[10] |
| Kecepatan rotasi (v sin i) | 7,7±1,7[12] km/s |
| Penamaan lain | |
| Referensi basis data | |
| SIMBAD | The system |
| A | |
| B | |
Lihat pula
Referensi
- Nicolet, B. (1978). "Photoelectric photometric Catalogue of homogeneous measurements in the UBV System". Observatory. Bibcode:1978ppch.book.....N.
- Casagrande, Luca; et al. (September 2008). "M dwarfs: effective temperatures, radii and metallicities". Monthly Notices of the Royal Astronomical Society. 389 (2): 585–607. arXiv:0806.2471
. Bibcode:2008MNRAS.389..585C. doi:10.1111/j.1365-2966.2008.13573.x. - Evans, D. S. (June 20–24, 1966). "The Revision of the General Catalogue of Radial Velocities". Dalam Batten, Alan Henry; Heard, John Frederick. Determination of Radial Velocities and their Applications, Proceedings from IAU Symposium no. 30. University of Toronto: International Astronomical Union. Bibcode:1967IAUS...30...57E.
- Soubiran, C.; Bienaymé, O.; Mishenina, T. V.; Kovtyukh, V. V. (March 2008). "Vertical distribution of Galactic disk stars. IV. AMR and AVR from clump giants". Astronomy and Astrophysics. 480 (1): 91–101. arXiv:0712.1370 . Bibcode:2008A&A...480...91S. doi:10.1051/0004-6361:20078788.
- Gould, Andrew; Chaname, Julio (2004-02). "New Hipparcos‐based Parallaxes for 424 Faint Stars". The Astrophysical Journal Supplement Series. 150 (2): 455–464. doi:10.1086/381147. ISSN 0067-0049.
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