| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Cancer |
| Right ascension | 09h 15m 09.4020s[1] |
| Declination | +23° 22′ 31.979″[1] |
| Apparent magnitude (V) | 8.05[2] |
| Characteristics | |
| Evolutionary stage | main sequence |
| Spectral type | G5 V[3] + M0 V[4] |
| Variable type | None[5] |
| Astrometry | |
| Radial velocity (Rv) | 19.94±0.14[1] km/s |
| Proper motion (μ) | RA: −127.013[1]mas/yr Dec.: −155.703[1]mas/yr |
| Parallax (π) | 20.5658±0.0198 mas[1] |
| Distance | 158.6 ± 0.2 ly (48.62 ± 0.05 pc) |
| Absolute magnitude (MV) | 4.62[6] |
| Details | |
| Primary (A) | |
| Mass | 1.08[7] M☉ |
| Radius | 1.05[2] R☉ |
| Luminosity | 1.07[2] L☉ |
| Surface gravity (log g) | 4.43[3] cgs |
| Temperature | 5,800[3] K |
| Metallicity [Fe/H] | +0.21[3] dex |
| Rotational velocity (v sin i) | 2.0[8] km/s |
| Age | 2.8[7] Gyr |
| Secondary (B) | |
| Temperature | 3,881[9] K |
| Metallicity [Fe/H] | 0.18[9] dex |
| Other designations | |
| BD+23°2063,HD 79498,HIP 45406,SAO 80717,2MASS J09150941+2322323[10] | |
| Database references | |
| SIMBAD | data |
HD 79498 is adouble star in the northernconstellation ofCancer. The primary component of this pair has an orbitingexoplanet companion. This star is too faint to be viewed with the naked eye, having anapparent visual magnitude of 8.05.[2] The system is located at a distance of 159 light years based onparallax measurements,[1] and is drifting further away with a heliocentricradial velocity of 20 km/s.[1] It has a relatively highproper motion, traversing thecelestial sphere at an angular rate of0.2″·yr−1.[11]
The primary, designated component A, is aG-type main-sequence star with astellar classification of G5 V.[3] It has 8%[7] greater mass compared to the Sun and a 5% larger girth.[2] The star is estimated to be 2.8[7] billion years old and appears to be spinning slowly with aprojected rotational velocity of 2.0 km/s.[8] It has a higher than solar abundance of elements other than hydrogen and helium; what astronomers term ametal-rich star.[12] The star is radiating 7% more luminosity than the Sun from itsphotosphere at aneffective temperature of 5,800 K.[3] There appears to be only a low level ofmagnetic activity in the star'schromosphere.[5]
The secondary member, component B, is located at aprojected separation of2,900 AU from the primary.[5] It is a smallred dwarf of spectral class M0 V.[4]
TheMcDonald Observatory planet search program discovered an exoplanet orbiting the primary in 2011 using theradial velocity method.[5]
| Companion (in order from star) | Mass | Semimajor axis (AU) | Orbital period (days) | Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| Ab | ≥1.34 ± 0.07 MJ | 3.13 ± 0.08 | 1966 ± 41 | 0.59 ± 0.02 | — | — |
