Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Delphinus |
Right ascension | 20h 28m 18.6367s[1] |
Declination | +18° 46′ 10.180″[1] |
Apparent magnitude (V) | 6.97 + 10.60[2] |
Characteristics | |
Spectral type | G1V[3] + K3:[4] |
B−V color index | 0.662±0.007[5] |
Astrometry | |
Radial velocity (Rv) | −91.290±0.0039[6] km/s |
Proper motion (μ) | RA: 349.620(16) mas/yr[1] Dec.: −56.618(19) mas/yr[1] |
Parallax (π) | 26.6465 ± 0.0225 mas[1] |
Distance | 122.4 ± 0.1 ly (37.53 ± 0.03 pc) |
Absolute magnitude (MV) | 4.01[5] |
Details[7] | |
HD 195019 A | |
Mass | 1.08±0.01[8] M☉ |
Radius | 1.47±0.04[8] R☉ |
Luminosity | 2.23±0.02[8] L☉ |
Surface gravity (log g) | 4.13±0.02[8] cgs |
Temperature | 5,825±56[8] K |
Metallicity [Fe/H] | 0.068±0.030[9] dex |
Rotational velocity (v sin i) | 2.47±0.50[9] km/s |
Age | 7.7±0.7[8] Gyr |
HD 195019 B | |
Mass | 0.7[10] M☉ |
Surface gravity (log g) | 4.46[11] cgs |
Temperature | 4,652[11] K |
Rotational velocity (v sin i) | 1.71[11] km/s |
Other designations | |
Database references | |
SIMBAD | data |
HD 195019 is a binary star system in the northern constellation of Delphinus. The brighter star has a close orbiting exoplanet companion. This system is located at a distance of 122 light years from the Sun based on parallax measurements,[1] but it is drifting closer with a radial velocity of −91.3 km/s.[6] Although it has an absolute magnitude of 4.01,[5] at that distance the system is considered too faint to be viewed with the naked eye, having a combined apparent visual magnitude of 6.87.[5] However, it should be readily visible with a pair of binoculars or a small telescope.[13]
The spectrum of the primary member, designated component A, presents as a G-type main-sequence star with a stellar classification of G1V.[3] An older stellar classification of G3 V/IV[14] suggested it may be near the end of its main sequence lifespan and is evolving into a subgiant star.[13] This is an older star with an estimated age of nearly 8[8] billion years and a low level of magnetic activity in its chromosphere.[8] The abundance of iron is near solar.[9] The star has a mass similar to the Sun but a larger radius. It is radiating 2.23 times the luminosity of the Sun from its photosphere at an effective temperature of 5,825 K.[8]
The co-moving companion, component B, was first reported by G. W. Hough in 1881. As of 2016, it is located at an angular separation of 3.40″ along a position angle of 334° relative to the primary.[2] This corresponds to a projected separation of 131 AU. This is a K-type star with 70% of the mass of the Sun[10] and is magnitude 10.60.[2]
Gaia DR3
was invoked but never defined (see the help page).Mason_et_al_2001
was invoked but never defined (see the help page).Gray_et_al_2001
was invoked but never defined (see the help page).Bidelman_1985
was invoked but never defined (see the help page).Anderson_Francis_2012
was invoked but never defined (see the help page).Soubiran_et_al_2018
was invoked but never defined (see the help page).Takeda2005
was invoked but never defined (see the help page).Bonfanti_et_al_2016
was invoked but never defined (see the help page).Butler2006
was invoked but never defined (see the help page).Quarles_et_al_2020
was invoked but never defined (see the help page).Rice_Brewer_2020
was invoked but never defined (see the help page).SIMBAD
was invoked but never defined (see the help page).Kaler
was invoked but never defined (see the help page).Fischer1999
was invoked but never defined (see the help page).