HD 70573

HD 70573

A light curve for V478 Hydrae, plotted from TESS data[1]
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Hydra
Right ascension 08h 22m 49.95277s[2]
Declination +01° 51′ 33.5522″[2]
Apparent magnitude (V) 8.66-8.77[3]
Characteristics
Evolutionary stage main sequence
Spectral type G1/2V[4]
B−V color index 0.59[5]
Variable type BY Dra[3]
Astrometry
Radial velocity (Rv)20.16±0.22[2] km/s
Proper motion (μ) RA: −51.362±0.017 mas/yr[2]
Dec.: −49.047±0.013 mas/yr[2]
Parallax (π)16.9267 ± 0.0168 mas[2]
Distance192.7 ± 0.2 ly
(59.08 ± 0.06 pc)
Absolute magnitude (MV)+0.4[6]
Details
Mass1.0±0.1[6] M☉
Radius0.98+0.01
−0.03[7] R☉
Luminosity0.998±0.004[7] L☉
Surface gravity (log g)4.59±0.10[6] cgs
Temperature5,837+80
−51[7] K
Metallicity [Fe/H]−0.18±0.20[6] dex
Rotation3.296 days[6]
Rotational velocity (v sin i)14.7±1.0[6] km/s
Age2.3±2.1[8] Gyr
Other designations
V478 Hya, BD+02°1951, HD 70573, SAO 116694[9]
Database references
SIMBADdata

HD 70573 is a variable star in the equatorial constellation of Hydra. At a mean apparent visual magnitude of +8.7, this yellow-hued star is too dim to be visible to the naked eye. Based upon parallax measurements, it is located at a distance of 193 light years from the Sun, and is drifting further away with a radial velocity of 20.5 km/s. It is a candidate member of the proposed Hercules-Lyra Association of co-moving stars,[5] although this membership is disputed.[10]

This is a G-type main-sequence star with a stellar classification of G1/2V.[4] It is a BY Draconis variable that ranges in brightness from magnitude 8.66 down to 8.77 with a rotationally-modulated period of 3.296 days.[3] HD 70573 is generally considered to be a young star although estimates of its age vary from 60[11] million years to several billion years.[8] It has a projected rotational velocity of 15 km/s[6] and about the same mass, size, and luminosity as the Sun.

  1. ^ Cite error: The named reference MAST was invoked but never defined (see the help page).
  2. ^ a b c d e Cite error: The named reference GaiaDR3 was invoked but never defined (see the help page).
  3. ^ a b c Cite error: The named reference Samus2017 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Houk1999 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Lopez2006 was invoked but never defined (see the help page).
  6. ^ a b c d e f g Cite error: The named reference Setiawan2007 was invoked but never defined (see the help page).
  7. ^ a b c Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference LDA2021 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Eisenbeiss2013 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Meshkat2017 was invoked but never defined (see the help page).