HD 175541

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HD 175541
Observation data
Epoch J2000      Equinox J2000
Constellation Serpens
Right ascension  18h 55m 40.884s[1]
Declination +04° 15′ 55.17″[1]
Apparent magnitude (V) 8.03
Spectral type G8IV
U−B color index 0.56
B−V color index 0.9
R−I color index 0.33
Radial velocity (Rv)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
Distanceapprox. 410 ly
(approx. 130 pc)
Absolute magnitude (MV)2.50
Mass1.65 M
Radius3.85 R
Surface gravity (log g)3.72 g cgs
Temperature5060 ± 44 K
Metallicity-7 ± 4 %
Age1.9 ± 1 G years
Other designations
BD +04º 3911, GC 25968, GCRV 11376, GJ 736, HIP 92895, SAO 124054.
Database references
Extrasolar Planets

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]
(in order from star)
Mass Semimajor axis
Orbital period
Eccentricity Inclination Radius
b >0.61 MJ 1.03 297.3 ± 6 0.33 ± 0.2

See also[edit]


  1. ^ a b c d e van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. Vizier catalog entry
  2. ^ a b Johnson, John Asher; et al. (2007). "Retired A Stars and Their Companions: Exoplanets Orbiting Three Intermediate-Mass Subgiants". The Astrophysical Journal. 665 (1): 785–793. arXiv:0704.2455. Bibcode:2007ApJ...665..785J. doi:10.1086/519677.

Coordinates: Sky map 18h 55m 40.8837s, +04° 15′ 55.169″