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BD-08°2823

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Also known as Ross 444

BD−08°2823 is a star with a pair of exoplanetary companions in the faint equatorial constellation of Sextans. The star has an apparent visual magnitude of 9.86, which is too faint to be visible with the naked eye. This system is located at a distance of 135 light-years from the Sun based on parallax measurements, and is trending further away with a radial velocity of +53 km/s. It is a high proper motion star that is traversing the celestial sphere at the angular rate of  yr−1.

Astronomical data · SIMBAD

Object type
PM*
Spectral type
K4:V
Distance
135 light-years
Redshift
z = 0.00017773540921828257
Coordinates
RA 150.1988° · Dec -9.5167°
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Wikidata facts

Constellation
Sextans
Child body
BD-08°2823 c
Distance from Earth
41.3342
Radius
0.71
Mass
0.5
Show 16 more facts
spectral class
K4:V
stellar rotational velocity
1.4
effective temperature
4816
parallax
24.1817
radial velocity
53.279
apparent magnitude
9.508946
declination component of proper motion
25.602
epoch
J2000.0
metallicity
-0.04
surface gravity
27000
luminosity
0.2366097
right ascension component of proper motion
-375.416
right ascension
150.198835317605
declination
-9.51667912959389
catalog code
TIC 33355302
age estimated by a dating method
4.5
Sources (1)

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Encyclopedic overview

3 sections
Contents
  • Planetary system
  • See also
  • References

BD−08°2823 is a star with a pair of exoplanetary companions in the faint equatorial constellation of Sextans. The star has an apparent visual magnitude of 9.86, which is too faint to be visible with the naked eye. This system is located at a distance of 135 light-years from the Sun based on parallax measurements, and is trending further away with a radial velocity of +53 km/s. It is a high proper motion star that is traversing the celestial sphere at the angular rate of  yr−1.

This is an ordinary K-type main-sequence star with a stellar classification of K4:V, where the ':' notation indicates some uncertainty. Emission cores in the H and K lines suggest this is an active star, with the level of activity varying significantly over time. It is roughly five billion years old and is spinning with a projected rotational velocity of 1.4 km/s. Measurements of the activity variation suggest a rotation period of around 27 days. This star is smaller, cooler, and less massive than the Sun. Its metal content is slightly lower than in the Sun. The star is radiating 24% of the luminosity of the Sun from its photosphere at an effective temperature of 4,746 K.

Excerpted from Wikipedia’s “BD-08°2823” article, available under the CC BY-SA 4.0 licence.

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