Zeta Reticuli

Zeta Reticuli
Observation data Epoch J2000.0 Equinox J2000.0
Location of ζ Reticuli (circled)
Constellation	Reticulum
ζ¹ Ret
Right ascension	03^h 17^m 46.16324^s
Declination	−62° 34′ 31.1563″
Apparent magnitude (V)	5.52
ζ² Ret
Right ascension	03^h 18^m 12.81853^s
Declination	−62° 30′ 22.9048″
Apparent magnitude (V)	5.22
Characteristics
Spectral type	G3−5V + G2V
U−B color index	+0.08 / +0.01
B−V color index	+0.63 / +0.58
R−I color index	+0.34 / +0.34
Astrometry
ζ¹ Ret
Radial velocity (R_v)	+12.2 km/s
Proper motion (μ)	RA: 1,337.57 mas/yr Dec.: 649.12 mas/yr
Parallax (π)	83.28 ± 0.20mas
Distance	39.16 ± 0.09 ly (12.01 ± 0.03 pc)
ζ² Ret
Radial velocity (R_v)	+11.5 km/s
Proper motion (μ)	RA: 1,330.74 mas/yr Dec.: 647.11 mas/yr
Parallax (π)	83.11 ± 0.19mas
Distance	39.24 ± 0.09 ly (12.03 ± 0.03 pc)
Details
ζ¹ Ret
Mass	0.958 M_☉
Radius	0.84 R_☉
Luminosity	0.69 L_☉
Surface gravity (log g)	4.54 ± 0.02 cgs
Temperature	5,746 ± 27 K
Metallicity [Fe/H]	−0.22 dex
Rotational velocity (v sin i)	1.98 km/s
Age	1.5–3.0 Gyr
ζ² Ret
Mass	0.985 M_☉
Radius	0.88 R_☉
Luminosity	0.82 L_☉
Surface gravity (log g)	4.46 ± 0.01 cgs
Temperature	5,859 ± 27 K
Metallicity [Fe/H]	−0.16 dex
Rotational velocity (v sin i)	1.74 km/s
Other designations
Zeta¹ Reticuli ζ¹ Reticuli, ζ¹ Ret, Zeta¹ Ret, CPD −63°217, GCTP 701.00, GJ 136, HD 20766, HIP 15330, HR 1006, LFT 275, LHS 171, LTT 1573, SAO 248770 Zeta² Reticuli ζ² Reticuli, ζ² Ret, Zeta² Ret, CPD −62°265, GCTP 705.00, GJ 138, HD 20807, HIP 15371, HR 1010, LFT 276, LHS 172, LTT 1576, SAO 248774
Database references
SIMBAD	data
Database references
SIMBAD	data

Zeta Reticuli (Zeta Ret, ζ Reticuli, ζ Ret) is a wide binary star system in the southern constellation of Reticulum. From the southern hemisphere the pair can be seen as a naked eye double star in very dark skies. Based upon parallax measurements, this system is located at a distance of about 39 light-years (12 parsecs) from the Earth. Zeta² Reticuli is orbited by a circumstellar debris disk. Both stars are solar analogs that have characteristics similar to those of the Sun. They belong to the Zeta Herculis Moving Group of stars that share a common origin.

The double star Zeta Reticuli is located in the western part of the small Reticulum constellation, about 25′ from the constellation's border with Horologium. In dark southern skies, the two stars can be viewed separately with the naked eye, or with a pair of binoculars. ζ¹ Reticuli has an apparent magnitude of 5.52, placing it on the border between 5th and 6th magnitude stars. ζ² Reticuli is slightly brighter at magnitude 5.22.

At a declination of −62°, the system is not visible from Britain's latitude of +53°, so it never received a Flamsteed designation in John Flamsteed's 1712 Historia Coelestis Britannica. The Bayer designation for this star system, Zeta (ζ) Reticuli, originated in a 1756 star map by the French astronomer Abbé Nicolas Louis de Lacaille. Subsequently, the two stars received separate designations in the Cape Photographic Durchmusterung, which was processed between 1859 and 1903, then in the Henry Draper Catalogue, published between 1918 and 1924.

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