HR 857

HR 857
Observation data Epoch J2000 Equinox J2000
Constellation	Eridanus
Right ascension	02^h 52^m 32.13^s ^[1]
Declination	–12° 46′ 11.0″ ^[1]
Apparent magnitude (V)	6.04
Characteristics
Spectral type	K1 V
U−B color index	0.57
B−V color index	0.86
V−R color index	0.48
R−I color index	0.41
Variable type	None
Astrometry

Radial velocity (R_v)	+18.4 km/s
Proper motion (μ)	RA: 397.41 ± 0.45 ^[1] mas/yr Dec.: -189.32 ± 0.36 ^[1] mas/yr
Parallax (π)	96.60 ± 0.40^[1] mas
Distance	33.8 ± 0.1 ly (10.35 ± 0.04 pc)
Absolute magnitude (M_V)	6.04

Details

Temperature	5225 ± 5.0^[2] K
Age	1 × 10⁸^[3] years

Other designations
32 G. Eridani, GJ 117, BD-13 544, HD 17925, HIP 13402, YPC 599

HR 857 (32 G. Eridani) is a solitary, orange, main sequence (K1 V) star located thirty-four light-years away, in the constellation Eridanus.

References

^ ^a ^b ^c ^d ^e van Leeuwen, F. (2007). "HIP 13402". Hipparcos, the New Reduction. http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=I/311/hip2&recno=13368. Retrieved 2009-12-11.
^ Kovtyukh et al. (2003). "High precision effective temperatures for 181 F-K dwarfs from line-depth ratios". Astronomy and Astrophysics 411 (3): 559–564. arXiv:astro-ph/0308429. Bibcode 2003A&A...411..559K. doi:10.1051/0004-6361:20031378. http://www.aanda.org/articles/aa/full/2003/46/aa3944/aa3944.html.
^ Mamajek, Eric E.; Hillenbrand, Lynne A. (November 2008). "Improved Age Estimation for Solar-Type Dwarfs Using Activity-Rotation Diagnostics". The Astrophysical Journal 687 (2): 1264–1293. Bibcode 2008ApJ...687.1264M. doi:10.1086/591785.

External links

ARICNS: 00255

← Star systems within 30–35 light-years

Star systems (including brown dwarf systems) within 30–35 light-years from Earth.

Giant
star

K III	Pollux (33.7 ± 0.3 ly; 1 star, 1 planet: planet b)

F
(Yellow-
white)

IV	Zeta Herculis «Rutilicus» (34.8 ± 0.2 ly; 2 stars)‡

V	Gamma Pavonis (30.1 ± 0.2 ly; 1 star)‡

G
(Yellow)

V	Beta Comae Berenices (29.9 ± 0.2 ly; 1 star)‡ • Kappa¹ Ceti (29.9 ± 0.2 ly; 1 star)‡ • HR 4523 (30.1 ± 0.2 ly; 2 stars, 1 planet: planet b)‡ • 61 Ursae Majoris (31.1 ± 0.2 ly; 1 star) • Alpha Mensae (33.1 ± 0.2 ly; 1 star) • Iota Persei (34.4 ± 0.3 ly; 1 star)

VI	Groombridge 1830 (29.9 ± 0.2 ly; 1 star)‡

K V (Orange)	HR 4458 (31.1 ± 0.2 ly; 2 stars) • Gliese 638 (31.9 ± 0.3 ly; 1 star) • 12 Ophiuchi (31.9 ± 0.3 ly; 1 star) • HR 511 (32.5 ± 0.2 ly; 1 star) • HR 5256 (33.0 ± 0.2 ly; 1 star) • Gliese 453 (33.2 ± 0.3 ly; 1 star) • HR 857 (33.9 ± 0.3 ly; 1 star) • Gliese 688 (34.9 ± 0.5 ly; 1 star)‡

M V (Red dwarf)	Gliese 176 (30.6 ly; 1 star, 1 planet: planet b)‡ • AU/AT Microscopii system (32.4 ly; 3 stars: AU Microscopii • AT Microscopii A • AT Microscopii B) • Gliese 22 (33.0 ly; 3 stars) • Gliese 436 (33.4 ly; 1 star, 1 planet: planet b) • Gliese 649 (33.7 ly; 1 star, 1 planet: planet b) • TVLM513-46546 (34.6 ly; 1 star)

White
Dwarf

DA	LHS 145 (31.7 ± 0.3 ly; 1 star) • Gliese 127.1 (33.4 ± 0.6 ly; 2 stars) • WD 0821-669 (34.7 ± 0.4 ly; 1 star)‡

DC	GJ 3182 (33.6 ± 1.3 ly; 1 star) • Gliese 339.1 (33.7 ± 0.6 ly; 1 star)

DQ	GJ 3306 (31.0 ± 0.8 ly; 1 star)

Brown
Dwarf

L	SDSS J1416+13 (25.7* ± 5.5 ly; 2 brown dwarfs)‡* • WISE 1647+5632 (28.1* + 9.4/- 5.6 ly; 1 brown dwarf)‡* • 2MASS J08251968+2115521 (34.8 ± 0.4 ly; 1 brown dwarf)‡

T	UGPS J0521+3640 (26.7* + 3.9/- 3.2 ly; 1 brown dwarf)‡* • 2MASS 0727+1710 (29.6* ± 0.6 ly; 1 brown dwarf)‡* • CFBDS J005910.90-011401.3 (30.1 + 1.5/- 1.3 ly; 1 brown dwarf)‡ • WISE 2313-8037 (30.3 ± 1.3 ly; 1 brown dwarf)‡ • WISE 1150+6302 (31.3 ly; 1 brown dwarf)‡ • WISE 2134-7137 (32.9 ly; 1 brown dwarf)‡ • 2MASS 0559-1404 (33.4 ± 0.4 ly; 1 brown dwarf) • ULAS J133553.45+113005.2 (33.7 ± 1.2 ly; 1 brown dwarf) • 2MASS 1237+6526 (33.9 ± 1.8 ly; 1 brown dwarf)‡ • WISE 0458+6434 (34.2 ± 4.6 ly; 2 brown dwarfs)‡ • 2MASS 1047+2124 (34.6 ± 1.4 ly; 1 brown dwarf)‡ • 2MASS J02431371-2453298 (34.8 ± 1.4 ly; 1 brown dwarf)‡

Y	WISE 1828+2650 (<30.7 ly; 1 brown dwarf)‡

In left column are stellar classes of primary members of star systems. ‡Distance error margin extends out of declared distance interval. Bold are systems containing at least one component with absolute magnitude of +8.5 or brighter. Italic are systems possibly located within declared distance interval, but probably not.

← «Bright» star systems within 30–40 light-years →

Star systems within 30–40 light-years from Earth with brightest member's absolute magnitude of +8.5 or brighter.

Giant
star

K III	Pollux (33.7 ± 0.3 ly; 1 star, 1 planet: planet b) • Arcturus (36.7 ± 0.3 ly; 1 star)

A
(White)

IV	Delta Capricorni «Scheddi» (38.6 ± 0.4 ly; 4 stars)

V	Denebola (36.2 ± 0.4 ly; 1 star)

F
(Yellow-
white)

IV	Zeta Herculis «Rutilicus» (34.8 ± 0.2 ly; 2 stars) • Beta Trianguli Australis (40.2* ± 0.3 ly; 2 stars)‡*

V	Gamma Pavonis (30.1 ± 0.2 ly; 1 star)‡ • Beta Virginis «Zavijava» (35.6 ± 0.3 ly; 2 stars) • Gamma Serpentis (36.3 ± 0.3 ly; 1 star) • Theta Persei (36.6 ± 0.3 ly; 2 stars) • Zeta Doradus (38.0 ± 0.2 ly; 1 star) • Iota Pegasi (38.3 ± 0.3 ly; 2 stars) • Gamma Virginis «Porrima» (38.7 ± 0.4 ly; 2 stars) • Zeta Trianguli Australis (39.5 ± 0.3 ly; 2 stars)

G
(Yellow)

IV	Eta Boötis «Muphrid» (37.0 ± 0.3 ly; 2 stars)

V	Beta Comae Berenices (29.9* ± 0.2 ly; 1 star)‡* • Kappa¹ Ceti (29.9* ± 0.2 ly; 1 star)‡* • HR 4523 (30.1 ± 0.2 ly; 2 stars, 1 planet: planet b)‡ • 61 Ursae Majoris (31.1 ± 0.2 ly; 1 star) • Alpha Mensae (33.1 ± 0.2 ly; 1 star) • Iota Persei (34.4 ± 0.3 ly; 1 star) • Delta Trianguli (35.4 ± 0.3 ly; 2 stars) • 11 Leonis Minoris (36.5 ± 0.3 ly; 2 stars) • Lambda Serpentis (38.3 ± 0.4 ly; 1 star) • Zeta Reticuli (39.4 ± 0.3 ly; 2 stars) • 85 Pegasi (39.5 ± 0.4 ly; 3 stars)

VI	Groombridge 1830 (29.9* ± 0.2 ly; 1 star)‡*

K V
(Orange)

HR 4458 (31.1 ± 0.2 ly; 2 stars) • Gliese 638 (31.9 ± 0.3 ly; 1 star) • 12 Ophiuchi (31.9 ± 0.3 ly; 1 star) • HR 511 (32.5 ± 0.2 ly; 1 star) • HR 5256 (33.0 ± 0.2 ly; 1 star) • Gliese 453 (33.2 ± 0.3 ly; 1 star) • HR 857 (33.9 ± 0.3 ly; 1 star) • Gliese 688 (34.9 ± 0.5 ly; 1 star) • Gliese 653 (35.1 ± 0.4 ly; 2 stars) • HR 9038 (35.2 ± 0.2 ly; 2 stars) • HR 637 (35.6 ± 0.2 ly; 2 stars, 1 planet: planet b) • HR 6806 (36.2 ± 0.2 ly; 1 star) • 54 Piscium (36.2 ± 0.3 ly; 1 star, 1 brown dwarf, 1 planet: planet b) • Gliese 320 (36.3 ± 0.2 ly; 1 star) • Gliese 370 (36.4 ± 0.3 ly; 1 star, 1 planet: planet b) • Gliese 505 (36.6 ± 0.4 ly; 2 stars) • Gliese 208 (37.1 ± 0.6 ly; 1 star) • Gliese 902 (37.2 ± 0.3 ly; 1 star) • Gliese 169 (37.4 ± 0.5 ly; 1 star) • HR 5553 (37.6 ± 0.4 ly; 2 stars) • Gliese 542 (38.6 ± 0.4 ly; 1 star) • HR 3384 (39.7 ± 0.3 ly; 1 star)‡ • HR 1925 (39.9 ± 0.4 ly; 1 star)‡

In left column are stellar classes of primary members of star systems. ‡Distance error margin extends out of declared distance interval. Italic are systems possibly located within declared distance interval, but probably not.