HD 10647

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**HD 10647**
Observation data Epoch J2000.0
Constellation (pronunciation)	Eridanus
Right ascension	1^h 42^m 29.32^s
Declination	−53° 44′ 27.00″
Apparent magnitude (V)	+5.52
Characteristics
Spectral type	F9V
U-B color index	?
B-V color index	0.551
Variable type	none
Astrometry
Radial velocity (R_v)	12.9 km/s
Proper motion (μ)	RA: 166.97 mas/yr Dec.: -106.71 mas/yr
Parallax (π)	57.63 ± 0.64 mas
Distance	56.57 ly (17.35 pc)
Absolute magnitude (M_V)	+4.32
Details
Mass	1.07 M_☉
Radius	1.11 R_☉
Luminosity	1.51 L_☉
Temperature	6143 ± 31 K
Metallicity	-0.03 ± 0.04 [Fe/H] ~0.93 times Solar
Rotation	7.2 days
Age	1750 million years
Other designations
q¹ Eridani, Gliese 109, HR 506, HIP 7978
Database references
SIMBAD	data

HD 10647, also known as q¹ Eridani, is a yellow-white dwarf star approximately 57 light-years away in the constellation of Eridanus (the River). It is a relatively nearby 6th (almost 5th) magnitude star. The star should be visible to the unaided eye under very dark skies, but with binoculars it is an easy target. It is slightly hotter and more luminous than the Sun. It is also younger being 1,750 million years old. As of 2003, a long-period extrasolar planet has been confirmed to orbit around the star.

[edit] Planetary system

In 2003, Michel Mayor's team announced the discovery of a new planet, HD 10647 b, in Paris at the XIX IAP Colloquium Extrasolar Planets: Today & Tormorrow. The Anglo-Australian Planet Search team could not detect the planet, but that can be due to the poor coverage of observations. The star is also chromospherically active, making radial velocity observations more difficult.

The ISO infrared space telescope detected a large excess of infrared radiation from the star, indicating a possible circumstellar disk. Because of the age of the star, the disk probably is somewhat similar to our Solar system's Kuiper Belt instead of a protoplanetary disk seen around young stars like Vega.