Садира (жұлдыз)

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Садира (Эридан Эпсилоны)
Eridanus epsilon location.png
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Eridanus
Right ascension 03h 32m 55.8442s[1]
Declination Үлгі:DEC[1]
Apparent magnitude (V) 3.73[1]
Characteristics
Spectral type K2V[1]
U-B color index +0.58[2]
B-V color index +0.88[2]
V-R color index +0.50
R-I color index +0.42
Variable type BY Draconis
Astrometry
Radial velocity (Rv) +15.5±0.9[1] km/s
Proper motion (μ) RA: −976.36[1] mas/yr
Dec.: 17.98[1] mas/yr
Parallax (π) 310.74 ± 0.85[1] mas
Distance Үлгі:ErrorBar2 ly
(Үлгі:ErrorBar2 pc)
Absolute magnitude (MV) 6.19[3]
Details
Mass 0.85[3] M
Radius 0.84[4] R
Surface gravity (log g) 4.57[5]
Luminosity 0.28 L
Temperature 5073±42[6] K
Metallicity [Fe/H]=−0.13±0.04[6]
Rotation 11.1 days
Age (0.5–1.0)Үлгі:Esp[7] years
Database references
SIMBAD data
Other designations
18 Eridani, BD -09°697, GCTP 742.00, GJ 144, HD 22049, HIP 16537, HR 1084, LHS 1557, SAO 130564, WDS 03330-0928[1]

Садира (Эридан Эпсилоны, ε Eri / ε Eridani) (араб.: аl-Sadirah‎) — K2 спектр табы бас тізбегіне жататын Эридан шоқжұлдызындағы жұлдыз. Күнді есепке алмағанда, телескопсыз көрінетін жұлдыздар тізімінде 3-ші орын алады.

  1. a b c d e f g h i HD 22049 -- Variable of BY Dra type. SIMBAD. Centre de Données astronomiques de Strasbourg. Тексерілді, 29 қараша 2007.
  2. a b Mendoza, E. E.; Gomez, V. T.; Gonzalez, S. (1978). "UBVRI photometry of 225 Am stars.". Astronomical Journal 83: 606–614. doi:10.1086/112242. http://cdsads.u-strasbg.fr/cgi-bin/nph-bib_query?1978AJ.....83..606M. Retrieved 2007-11-29. 
  3. a b Staff The One Hundred Nearest Star Systems. Research Consortium on Nearby Stars (June 8, 2007). Тексерілді, 29 қараша 2007.
  4. Johnson, H. M.; Wright, C. D. (1983). "Predicted infrared brightness of stars within 25 parsecs of the sun". Astrophysical Journal Supplement Series 53: 643–711. doi:10.1086/190905. http://adsbit.harvard.edu/abs/1983ApJS...53..643J. Retrieved 2007-11-29. —see p. 653.
  5. Zhao, G.; Chen, Y. Q.; Qiu, H. M.; Li, Z. W. (2002). "Chemical Abundances of 15 Extrasolar Planet Host Stars". The Astronomical Journal 124 (4): 2224–2232. doi:10.1086/342862. http://www.journals.uchicago.edu/doi/full/10.1086/342862. Retrieved 2007-06-01. 
  6. a b Santos, N. C.; Israelian, G.; Mayor, M. (2004). "Spectroscopic [Fe/H] for 98 extra-solar planet-host stars: Exploring the probability of planet formation". Astronomy & Astrophysics 415: 1153–1166. doi:10.1051/0004-6361:20034469. http://arxiv.org/abs/astro-ph/0311541. Retrieved 2007-11-29. —the percentage of iron is given by \begin{smallmatrix}10^{-0.13} = 0.74\end{smallmatrix}, or 74%
  7. Di Folco, E. et al (2004). "VLTI near-IR interferometric observations of Vega-like stars. Radius and age of α PsA, β Leo, β Pic, ε Eri and τ Cet". Astronomy and Astrophysics 426: 601–617. http://adsabs.harvard.edu/abs/2004A&A...426..601D. Retrieved 2008-07-24.