Iota Virginis information

ι Virginis
(Syrma)
	Location of ι Virginis in Virgo (circled)
Observation data; Epoch J2000 Equinox J2000
Constellation	Virgo
Right ascension	14h 16m 00.868s
Declination	−06° 00′ 01.969″
Apparent magnitude (V)	4.08
Characteristics
Evolutionary stage	Between main sequence and subgiant
Spectral type	F7IV-V
U−B color index	+0.02
B−V color index	+0.52
Astrometry
Radial velocity (Rv)	11.93±0.25 km/s
Proper motion (μ)	RA: -26.606 mas/yr ; Dec.: -414.866 mas/yr
Parallax (π)	45.4014 ± 0.2858 mas
Distance	71.8 ± 0.5 ly ; (22.0 ± 0.1 pc)
Absolute magnitude (MV)	2.4
Orbit
Period (P)	55 yr
Semi-major axis (a)	0.830 ± 0.020″
Eccentricity (e)	0.1 ± 0.2
Inclination (i)	60 ± 9°
Longitude of the node (Ω)	3 ± 20°
Periastron epoch (T)	1950.7 ± 2.7
Argument of periastron (ω); (secondary)	336 ± 27°
Details
ι Vir A
Mass	1.44±0.01 M☉
Radius	2.89±0.15 R☉
Luminosity	10.2±0.1 L☉
Surface gravity (log g)	3.65 cgs
Temperature	6,055±151 K
Metallicity [Fe/H]	−0.28±0.04 dex
Rotational velocity (v sin i)	16 km/s
ι Vir B
Mass	0.6 ± 0.2 M☉
Other designations
	Syrma, 99 Vir, BD−05°3843, FK5 525, GJ 9473, HD 124850, HIP 69701, HR 5338, SAO 139824
Database references
SIMBAD	data

Iota Virginis (ι Virginis, abbreviated Iota Vir, ι Vir) is a binary star in the constellation of Virgo. Its apparent magnitude is 4.08.^[2] Based on its parallax, it is assumed to be relatively nearby, at 71.8 light-years (22.0 parsecs).^[1]

Its two components are designated Iota Virginis A (officially named Syrma /ˈsɜːrmə/,^[7] the traditional name for the system)^[8] and B.

^ ^a ^b ^c ^d ^e ^f Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
^ ^a ^b Gray, R. O.; Napier, M. G.; Winkler, L. I. (2001). "The Physical Basis of Luminosity Classification in the Late A-, F-, and Early G-Type Stars. I. Precise Spectral Types for 372 Stars". The Astronomical Journal. 121 (4): 2148. Bibcode:2001AJ....121.2148G. doi:10.1086/319956.
^ ^a ^b ^c ^d ^e Gontcharov, G.A.; Kiyaeva, O.V. (2010). "Photocentric orbits from a direct combination of ground-based astrometry with Hipparcos II. Preliminary orbits for six astrometric binaries". New Astronomy. 15 (3): 324–331. arXiv:1606.08182. Bibcode:2010NewA...15..324G. doi:10.1016/j.newast.2009.09.006. S2CID 119252073.
^ ^a ^b Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data. Bibcode:1986EgUBV........0M.
^ ^a ^b Aguilera-Gómez, Claudia; Ramírez, Iván; Chanamé, Julio (2018-06-01). "Lithium abundance patterns of late-F stars: an in-depth analysis of the lithium desert". Astronomy and Astrophysics. 614: A55. arXiv:1803.05922. Bibcode:2018A&A...614A..55A. doi:10.1051/0004-6361/201732209. ISSN 0004-6361. Iota Virginis' databasee entry at VizieR.
^ ^a ^b ^c ^d Baines, Ellyn K.; Clark, James H., III; Schmitt, Henrique R.; Stone, Jordan M.; von Braun, Kaspar (2023-12-01). "33 New Stellar Angular Diameters from the NPOI, and Nearly 180 NPOI Diameters as an Ensemble". The Astronomical Journal. 166 (6): 268. Bibcode:2023AJ....166..268B. doi:10.3847/1538-3881/ad08be. ISSN 0004-6256.{{cite journal}}: CS1 maint: multiple names: authors list (link)
^ "syrma". Oxford English Dictionary (Online ed.). Oxford University Press. (Subscription or participating institution membership required.)
^ "Naming Stars". IAU.org. Retrieved 16 December 2017.

[DR3-1] ^ ^a ^b ^c ^d ^e ^f Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.

[Gray-2] Gray, R. O.; Napier, M. G.; Winkler, L. I. (2001). "The Physical Basis of Luminosity Classification in the Late A-, F-, and Early G-Type Stars. I. Precise Spectral Types for 372 Stars". The Astronomical Journal. 121 (4): 2148. Bibcode:2001AJ....121.2148G. doi:10.1086/319956.

[Gontcharov-3] Gontcharov, G.A.; Kiyaeva, O.V. (2010). "Photocentric orbits from a direct combination of ground-based astrometry with Hipparcos II. Preliminary orbits for six astrometric binaries". New Astronomy. 15 (3): 324–331. arXiv:1606.08182. Bibcode:2010NewA...15..324G. doi:10.1016/j.newast.2009.09.006. S2CID 119252073.

[EgUBV-4] Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data. Bibcode:1986EgUBV........0M.

[a-g-5] Aguilera-Gómez, Claudia; Ramírez, Iván; Chanamé, Julio (2018-06-01). "Lithium abundance patterns of late-F stars: an in-depth analysis of the lithium desert". Astronomy and Astrophysics. 614: A55. arXiv:1803.05922. Bibcode:2018A&A...614A..55A. doi:10.1051/0004-6361/201732209. ISSN 0004-6361. Iota Virginis' databasee entry at VizieR.

[npoi-6] Baines, Ellyn K.; Clark, James H., III; Schmitt, Henrique R.; Stone, Jordan M.; von Braun, Kaspar (2023-12-01). "33 New Stellar Angular Diameters from the NPOI, and Nearly 180 NPOI Diameters as an Ensemble". The Astronomical Journal. 166 (6): 268. Bibcode:2023AJ....166..268B. doi:10.3847/1538-3881/ad08be. ISSN 0004-6256.{{cite journal}}: CS1 maint: multiple names: authors list (link)

[7] "syrma". Oxford English Dictionary (Online ed.). Oxford University Press. (Subscription or participating institution membership required.)

[IAU-LSN-8] "Naming Stars". IAU.org. Retrieved 16 December 2017.

Observation data Epoch J2000 Equinox J2000
Location of ι Virginis in Virgo (circled)
Constellation	Virgo
Right ascension	14^h 16^m 00.868^s^[1]
Declination	−06° 00′ 01.969″^[1]
Apparent magnitude (V)	4.08^[2]
Characteristics
Evolutionary stage	Between main sequence and subgiant
Spectral type	F7IV-V^[3]
U−B color index	+0.02^[4]
B−V color index	+0.52^[4]
Astrometry

Radial velocity (R_v)	11.93±0.25^[1] km/s
Proper motion (μ)	RA: -26.606 mas/yr^[1] Dec.: -414.866 mas/yr^[1]
Parallax (π)	45.4014 ± 0.2858 mas^[1]
Distance	71.8 ± 0.5 ly (22.0 ± 0.1 pc)
Absolute magnitude (M_V)	2.4^[3]

Orbit^[3]
Period (P)	55 yr
Semi-major axis (a)	0.830 ± 0.020″
Eccentricity (e)	0.1 ± 0.2
Inclination (i)	60 ± 9°
Longitude of the node (Ω)	3 ± 20°
Periastron epoch (T)	1950.7 ± 2.7
Argument of periastron (ω) (secondary)	336 ± 27°
Details
ι Vir A
Mass	1.44±0.01^[5] `M`_☉
Radius	2.89±0.15^[6] `R`_☉
Luminosity	10.2±0.1^[6] `L`_☉
Surface gravity (log g)	3.65^[6] cgs
Temperature	6,055±151^[6] K
Metallicity [Fe/H]	−0.28±0.04^[5] dex
Rotational velocity (v sin i)	16^[3] km/s
ι Vir B
Mass	0.6 ± 0.2^[3] `M`_☉
Other designations
Syrma, 99 Vir, BD−05°3843, FK5 525, GJ 9473, HD 124850, HIP 69701, HR 5338, SAO 139824
Database references
SIMBAD	data

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