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HD 202951

Star in the constellation Equuleus

Star in the constellation Equuleus

| b-v = 1.648 | u-b =

HD 202951 is a probable binary star system located in the northern constellation of Equuleus. It is near the lower limit of visibility to the naked eye, having an apparent visual magnitude of 5.97. The distance to this system can be estimated from the annual parallax shift of , yielding a value of roughly 980 light years. It is moving closer with a heliocentric radial velocity of −37 km/s.

Griffin (2012) found this to be a single-lined spectroscopic binary system with an orbital period of 999.8 +/- and an eccentricity of 0.23. The a sin i value for the primary component is 54.8 +/-, where a is the semimajor axis and i is the (unknown) orbital inclination. This value provides a lower bound for the actual semimajor axis.

The visible component is an evolved K-type giant star with a stellar classification of K5 III. It is a candidate variable star of unknown type, showing an amplitude variation of 0.0115 magnitude with a frequency of 0.47645 times per day, or one cycle per 2.1 days. X-ray emission has been detected from this system.

References

| display-authors=1 | last1=De Medeiros | first1=J. R.

| doi-access=free | arxiv=astro-ph/0112194 | s2cid=10505995 | postscript=. }}

References

  1. "HD 202951".
  2. {{cite Gaia DR3. 1745557619143211648
  3. {{cite XHIP. 105224
  4. (2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal.
  5. (2023). "Stellar ages, masses, extinctions, and orbital parameters based on spectroscopic parameters of Gaia DR3". Astronomy and Astrophysics.
  6. (2024). "Transferring spectroscopic stellar labels to 217 million Gaia DR3 XP stars with SHBoost". Astronomy and Astrophysics.
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k-type-giants durchmusterung-objects equuleus henry-draper-catalogue-objects hipparcos-objects bright-star-catalogue-objects spectroscopic-binaries
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