Садира (жұлдыз)

**Садира (Эридан Эпсилоны)**
Observation data Epoch J2000.0 Equinox J2000.0

Constellation	Eridanus
Right ascension	03^h 32^m 55.8442^s^[1]
Declination	−09° 27′ 29.744 ″^[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 (R_v)	+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 (M_V)	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.

↑ ^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.
↑ ^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. ISSN 0004-6256. http://cdsads.u-strasbg.fr/cgi-bin/nph-bib_query?1978AJ.....83..606M. Retrieved 2007-11-29.
↑ ^a ^b Staff The One Hundred Nearest Star Systems. Research Consortium on Nearby Stars (8 маусым, 2007). Тексерілді, 29 қараша 2007.
↑ 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.
↑ 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.
↑ ^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%
↑ 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.

[SIMBAD-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.

[apj83-2] Mendoza, E. E.; Gomez, V. T.; Gonzalez, S. (1978). "UBVRI photometry of 225 Am stars.". Astronomical Journal 83: 606–614. doi:10.1086/112242. ISSN 0004-6256. http://cdsads.u-strasbg.fr/cgi-bin/nph-bib_query?1978AJ.....83..606M. Retrieved 2007-11-29.

[RECONS-3] Staff The One Hundred Nearest Star Systems. Research Consortium on Nearby Stars (8 маусым, 2007). Тексерілді, 29 қараша 2007.

[apjss53-4] 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.

[aaa415-6] 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%

[aaa426-7] 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.

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