Delta Indi information

Delta Indi
Observation data; Epoch J2000.0 Equinox J2000.0 (ICRS)
Constellation	Indus
Right ascension	21h 57m 55.07353s
Declination	−54° 59′ 33.2740″
Apparent magnitude (V)	+4.40 (4.80 + 5.96)
Characteristics
Spectral type	F0 IV + F0 IV
U−B color index	+0.10
B−V color index	+0.28
Astrometry
Proper motion (μ)	RA: +41.94 mas/yr ; Dec.: −3.93 mas/yr
Parallax (π)	17.34 ± 0.48 mas
Distance	188 ± 5 ly ; (58 ± 2 pc)
Absolute magnitude (MV)	+0.60
Orbit
Period (P)	12.237±0.080 yr
Semi-major axis (a)	0.176±0.004″
Eccentricity (e)	0.032±0.032
Inclination (i)	76.3±2.0°
Longitude of the node (Ω)	90.8±2.0°
Periastron epoch (T)	2007.518±0.480
Argument of periastron (ω); (secondary)	64.9±11.0°
Details
δ Ind A
Mass	1.78±0.21 M☉
Luminosity	48 L☉
Surface gravity (log g)	3.85 cgs
Temperature	7,445±253 K
Metallicity [Fe/H]	−0.21 dex
Rotational velocity (v sin i)	130 km/s
Age	462 Myr
δ Ind B
Mass	1.33±0.16 M☉
Other designations
	δ Ind, CPD−55° 9733, FK5 824, HD 208450, HIP 108431, HR 8368, SAO 247244, WDS J21579-5500AB
Database references
SIMBAD	data

Delta Indi, Latinized from δ Indi, is a binary star^[4] system in the southern constellation of Indus. It is visible to the naked eye with a combined apparent visual magnitude of +4.40.^[2] The brighter primary, designated component A, is magnitude 4.80 while the companion, component B, is magnitude 5.96.^[3] Based upon an annual parallax shift of 14.07 mas as measured from Earth,^[1] the system is located about 188 light years from the Sun.

The binary nature of this system was discovered by South African astronomer William Stephen Finsen from 1936 onward,^[4] with his published orbital elements appearing in 1956.^[9] The pair have an orbital period of 12.2 years, a semimajor axis of 0.176 arc seconds, and an eccentricity of around 0.03. Both components have been listed with a stellar classification of F0 IV by multiple authors, suggesting they are yellow-white hued F-type subgiant stars. However, their estimated masses don't match this classification, so Docobo and Andrade (2013) suggest the Hipparcos parallax may have been underestimated.^[4]

^ ^a ^b ^c ^d ^e ^f Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
^ ^a ^b ^c ^d Cite error: The named reference Nicolet1978 was invoked but never defined (see the help page).
^ ^a ^b Cite error: The named reference Malkov2012 was invoked but never defined (see the help page).
^ ^a ^b ^c ^d ^e ^f ^g Cite error: The named reference Docobo2013 was invoked but never defined (see the help page).
^ ^a ^b ^c Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
^ ^a ^b ^c Cite error: The named reference David2015 was invoked but never defined (see the help page).
^ Cite error: The named reference vanBelle2012 was invoked but never defined (see the help page).
^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
^ Cite error: The named reference Finsen1956 was invoked but never defined (see the help page).

[vanLeeuwen2007-1] ^ ^a ^b ^c ^d ^e ^f Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).

[Nicolet1978-2] Cite error: The named reference Nicolet1978 was invoked but never defined (see the help page).

[Malkov2012-3] Cite error: The named reference Malkov2012 was invoked but never defined (see the help page).

[Docobo2013-4] ^ ^a ^b ^c ^d ^e ^f ^g Cite error: The named reference Docobo2013 was invoked but never defined (see the help page).

[Anderson2012-5] Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).

[David2015-6] Cite error: The named reference David2015 was invoked but never defined (see the help page).

[vanBelle2012-7] Cite error: The named reference vanBelle2012 was invoked but never defined (see the help page).

[SIMBAD-8] Cite error: The named reference SIMBAD was invoked but never defined (see the help page).

[Finsen1956-9] Cite error: The named reference Finsen1956 was invoked but never defined (see the help page).

Observation data Epoch J2000.0 Equinox J2000.0 (ICRS)
Constellation	Indus
Right ascension	21^h 57^m 55.07353^s^[1]
Declination	−54° 59′ 33.2740″^[1]
Apparent magnitude (V)	+4.40^[2] (4.80 + 5.96)^[3]
Characteristics
Spectral type	F0 IV + F0 IV^[4]
U−B color index	+0.10^[2]
B−V color index	+0.28^[2]
Astrometry

Proper motion (μ)	RA: +41.94^[1] mas/yr Dec.: −3.93^[1] mas/yr
Parallax (π)	17.34 ± 0.48 mas^[1]
Distance	188 ± 5 ly (58 ± 2 pc)
Absolute magnitude (M_V)	+0.60^[5]

Orbit^[4]
Period (P)	12.237±0.080 yr
Semi-major axis (a)	0.176±0.004″
Eccentricity (e)	0.032±0.032
Inclination (i)	76.3±2.0°
Longitude of the node (Ω)	90.8±2.0°
Periastron epoch (T)	2007.518±0.480
Argument of periastron (ω) (secondary)	64.9±11.0°
Details
δ Ind A
Mass	1.78±0.21^[4] `M`_☉
Luminosity	48^[5] `L`_☉
Surface gravity (log g)	3.85^[6] cgs
Temperature	7,445±253^[6] K
Metallicity [Fe/H]	−0.21^[5] dex
Rotational velocity (v sin i)	130^[7] km/s
Age	462^[6] Myr
δ Ind B
Mass	1.33±0.16^[4] `M`_☉
Other designations
δ Ind, CPD−55° 9733, FK5 824, HD 208450, HIP 108431, HR 8368, SAO 247244, WDS J21579-5500AB^[8]
Database references
SIMBAD	data

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