NSVS 14256825

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NSVS 14256825
Observation data
Epoch J2000      Equinox J2000
Constellation Aquila
Right ascension  20h 20m 00.458s[1]
Declination +04° 37′ 56.50″[1]
Apparent magnitude (V) 13.2[2]
Spectral type sdOB / M V[2]
Radial velocity (Rv)12.10[3] km/s
Proper motion (μ) RA: 9.0[3] mas/yr
Dec.: 0.0[3] mas/yr
Period (P)0.1103741681
Inclination (i)82.5°
Periastron epoch (T)2454274.20874 JD
Mass0.528 M
Temperature42000 K
Other designations
V1828 Aql, UCAC2 33483055, 2MASS J20200045+0437564
Database references

NSVS 14256825, also known as V1828 Aquilae, is an eclipsing binary system (of the Algol type) in the constellation of Aquila. The system comprises an eclipsing subdwarf OB star and red dwarf star. The two stars orbit each other every 2.648976 hours.[4]

Eclipse timing variations[edit]

Based on variations in the timing of the system's eclipses, in 2012 it was claimed that two giant planets were in orbit around the binary, with masses of 2.9 and 8.1 times the mass of Jupiter orbiting with periods of 3.5 and 6.9 years respectively.[4] The proposed system was later shown to be extremely unstable, lasting less than a thousand years (i.e., much shorter than the age of the system); more observations are needed.

See also[edit]


  1. ^ a b Zacharias, N. (2003). "VizieR Online Data Catalog: The Second U.S. Naval Observatory CCD Astrograph Catalog (UCAC2)". Bibcode:2003yCat.1289....0Z. Cite journal requires |journal= (help)
  2. ^ a b c "Notes on NSVS 1425 (AB) b". Retrieved 26 November 2016.
  3. ^ a b c "NSVS 14256825". SIMBAD. Centre de données astronomiques de Strasbourg.
  4. ^ a b c Almeida, L. A.; Jablonski, F.; Tello, J.; Rodrigues, C. V. (2012). "A photometric and spectroscopic study of NSVS 14256825: the second sdOB+dM eclipsing binary". Monthly Notices of the Royal Astronomical Society. 423: 478–485. arXiv:1203.1266. Bibcode:2012MNRAS.423..478A. doi:10.1111/j.1365-2966.2012.20891.x.