Epoch J2000 Equinox J2000
|Right ascension||20h 20m 00.458s|
|Declination||+04° 37′ 56.50″|
|Apparent magnitude (V)||13.2|
|Spectral type||sdOB / M V|
|Radial velocity (Rv)||12.10 km/s|
|Proper motion (μ)|| RA: 9.0 mas/yr |
Dec.: 0.0 mas/yr
|Periastron epoch (T)||2454274.20874 JD|
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.
Eclipse timing variations
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. 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.
- Zacharias, N. (2003). "VizieR Online Data Catalog: The Second U.S. Naval Observatory CCD Astrograph Catalog (UCAC2)". Bibcode:2003yCat.1289....0Z. Cite journal requires
- "Notes on NSVS 1425 (AB) b". Retrieved 26 November 2016.
- "NSVS 14256825". SIMBAD. Centre de données astronomiques de Strasbourg.
- 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.
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