HD 175541

HD 175541
Observation data Epoch J2000 Equinox J2000
Constellation	Serpens
Right ascension	18^h 55^m 40.884^s^[1]
Declination	+04° 15′ 55.17″^[1]
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: -6.82 ± 1.01^[1] mas/yr Dec.: -89.23 ± 0.79^[1] mas/yr
Parallax (π)	7.87 ± 0.95^[1] mas
Distance	approx. 410 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 cgs
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.)

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 410 light years from Earth. Despite its distance of over 100 ly, It was given the number 736 in the Gliese Catalogue of Nearby Stars.

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), United States.^[2]

The HD 175541 planetary system^[2]
Companion (in order from star)	Mass	Semimajor axis (AU)	Orbital period (days)	Eccentricity	Inclination	Radius
b	>0.61 M_J	1.03	297.3 ± 6	0.33 ± 0.2	—	—

References

Stars
(list)

Bayer	α (Unukalhai) β (Chow) γ δ (Tsin) ε ζ η (Tang) θ (Alya) ι κ λ μ ν ξ ο π ρ σ τ¹ τ² τ³ τ⁴ τ⁵ τ⁶ τ⁷ τ⁸ υ φ χ ψ ω

Flamsteed	3 4 5 6 7 8 10 11 14 16 25 29 36 39 40 43 45 46 47 59 60 61 64 3 Her 47 Oph

Variable	R W X RT UZ VV VY WX AA AN AO AP AR AU BQ CT CV CW EG FH FI FK FL FQ FR LV LW LX MR MS MT MV MY NN NO NQ NW OO OU PS QV QX QY V382 V411

HR	5665 5690 5692 5706 5711 5740 5745 5783 5796 5831 5850 5859 5861 5874 5909 5913 5931 5992 6005 6011 6014 6016 6449 6544 6562 6568 6600 6620 6666 6681 6755 6756 6757 6785 6830 6840 6843 6858 6890 6898 6928 6993 6999 7008 7048 7076 7144

HD	135061 135615 136027 136118 138085 142245 143436 145936 146740 157969 168112 168443 168746 175541

Gliese	Gliese 701 Gliese 710 GJ 1224

Other	ADS 9544 AS 296 COROT-9 COROT-11 COROT-23 GX 17+2 IRAS 18418-0440 MWC 297 MWC 922 PG 1510+234 PG 1605+072 PSR B1534+11 PSR J1719-1438 Serpens FIRS 1 Serpens SVS 20 Serpens X-1

Association	Serpens OB2

Open	IC 4756 Messier 16 NGC 6604 NGC 6605 Serpens south

Globular	Messier 5 NGC 6535 NGC 6539 Palomar 5

NGC	5887 5910 5911 5913 5919 5920 5921 5926 5928 5931 5936 5937 5940 5942 5941 5944 5951 5953 5954 5952 5956 5955 5957 5960 5962 5964 5970 5972 5975 5977 5980 5983 5984 5988 5991 5990 5994 5996 5997 6003 6004 6008 6006 6007 6009 6012 6010 6014 6020 6017 6018 6021 6022 6023 6027 6027a 6027b 6027c 6027d 6027e 6029 6033 6037 6036 6051 6063 6065 6066 6070 6080 6100 6118 6172

Other	Arp 72 Arp 220 3C 317 3C 318 3C 321 3C 323.1 3C 324 3C 326 4C 11.50 Hoag's Object IRAS 15107+0724 NRAO 530 PDS 456 PG 1553+113 PKS 1546+027

Other

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