HD 175541

HD 175541
Observation data; Epoch J2000 Equinox J2000
Constellation	Serpens
Right ascension	18h 55m 40.8837s
Declination	+04° 15′ 55.169″
Apparent magnitude (V)	8.03
Characteristics
Spectral type	G8IV
U−B color index	0.56
B−V color index	0.9
R−I color index	0.33
Astrometry
Radial velocity (Rv)	18.4 ± 2 km/s
Proper motion (μ)	RA: -7.84 ± 1.01 mas/yr; Dec.: -89.86 ± 0.81 mas/yr
Parallax (π)	7.84 ± 1.13 mas
Distance	approx. 420 ly; (approx. 130 pc)
Absolute magnitude (MV)	2.50
Details
Mass	1.65 M☉
Radius	3.85 R☉
Surface gravity (log g)	3.72 g
Temperature	5060 ± 44 K
Metallicity	-7 ± 4 %
Age	1.9 ± 1 G years
Other designations
	BD +04º 3911, GC 25968, GCRV 11376, GJ 736, HIP 92895, SAO 124054.
Database references
SIMBAD	data
ARICNS	data
Extrasolar Planets; Encyclopaedia	data
	Data sources:
	Hipparcos Catalogue,; CCDM (2002),; Bright Star Catalogue (5th rev. ed.)

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HD 175541 is an intermediate-mass subgiant star in the constellation Serpens. That means when this star was a main-sequence, it was an A-type star. It is an 8th magnitude star about 416 light years from Earth. Despite of its distance of over 100 ly, there is the Gliese number 736.

In April 2007, the planet was found orbiting around one of the three preferred intermediate-mass subgiants that has changes in radial velocity trends, from Lick and Keck Observatories in Mount Hamilton (California) and Mauna Kea (Hawai'i), USA.^[1]

The HD 175541 system^[1]
Companion (in order from star)	Mass	Semimajor axis (AU)	Orbital period (days)	Eccentricity
b	>0.61 M_J	1.03	297.3 ± 6	0.33 ± 0.2

[edit] See also

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Observation data Epoch J2000 Equinox J2000
Constellation	Serpens
Right ascension	18^h 55^m 40.8837^s
Declination	+04° 15′ 55.169″
Apparent magnitude (V)	8.03
Characteristics
Spectral type	G8IV
U−B color index	0.56
B−V color index	0.9
R−I color index	0.33
Astrometry

Radial velocity (R_v)	18.4 ± 2 km/s
Proper motion (μ)	RA: -7.84 ± 1.01 mas/yr Dec.: -89.86 ± 0.81 mas/yr
Parallax (π)	7.84 ± 1.13 mas
Distance	approx. 420 ly (approx. 130 pc)
Absolute magnitude (M_V)	2.50

Details

Mass	1.65 M_☉
Radius	3.85 R_☉
Surface gravity (log g)	3.72 g
Temperature	5060 ± 44 K
Metallicity	-7 ± 4 %
Age	1.9 ± 1 G years

Other designations
BD +04º 3911, GC 25968, GCRV 11376, GJ 736, HIP 92895, SAO 124054.
Database references
SIMBAD	data
ARICNS	data
Extrasolar Planets Encyclopaedia	data
Data sources:
Hipparcos Catalogue, CCDM (2002), Bright Star Catalogue (5th rev. ed.)