HD 240429 (nicknamed Krios) and HD 240430 (Kronos) is a wide binary star system in the constellation of Cassiopeia. Both components of the system are yellow G-type main-sequence stars.[3] HD 240430 is a Sun-like star in appearance, but it seems to have eaten its own planets, for which it is given the nickname Kronos, after the Greek god and the leader of the first generation of Titans.[7] Its unusual properties were described by a team of astrophysicists at Princeton University in 2017, led by Semyeong Oh.[8]

Quick Facts Apparent magnitude (V), Characteristics ...
HD 240429 and HD 240430
Observation data
Epoch J2000      Equinox J2000
Constellation Cassiopeia
HD 240429 (Krios)
Right ascension 23h 51m 55.0285s[1]
Declination +59° 42 48.613[1]
Apparent magnitude (V) 9.70[2]
HD 240430 (Kronos)
Right ascension 23h 52m 09.2427s[1]
Declination +59° 42 26.526[1]
Apparent magnitude (V) 9.56[2]
Characteristics
HD 240429
Spectral type G0[3]
HD 240430
Spectral type G2[3]
Astrometry
HD 240429
Radial velocity (Rv)−21.2[3] km/s
Proper motion (μ) RA: 89.25[4] mas/yr
Dec.: −29.68[4] mas/yr
Parallax (π)9.7004 ± 0.0250 mas[4]
Distance336.2 ± 0.9 ly
(103.1 ± 0.3 pc)
HD 240430
Radial velocity (Rv)−21.2[3] km/s
Proper motion (μ) RA: 89.41[4] mas/yr
Dec.: −30.12[4] mas/yr
Parallax (π)9.6884 ± 0.0257 mas[4]
Distance336.6 ± 0.9 ly
(103.2 ± 0.3 pc)
Details[3]
HD 240429
Surface gravity (log g)4.43 ± 0.028 cgs
Temperature5878 ± 25 K
Metallicity [Fe/H]0.01 ± 0.010 dex
Rotational velocity (v sin i)1.1 km/s
Age4.00+1.51
−1.56
 Gyr
HD 240430
Surface gravity (log g)4.33 ± 0.028 cgs
Temperature5803 ± 25 K
Metallicity [Fe/H]0.20 ± 0.010 dex
Rotational velocity (v sin i)2.5 km/s
Age4.28+1.11
−1.03
 Gyr
Other designations
HD 240429: BD+58° 2662, HD 240429, SAO 35851[5]
HD 240430: BD+58° 2663, HD 240430, SAO 35854[6]
Database references
SIMBADHD 240429
HD 240430
Close

Kronos and Krios are about 350 light years away from Earth.[9] Formed around four billion years ago, they originated from the same interstellar cloud. They are moving together through space and are assumed to orbit each other slowly, with an estimated period of about 10,000 years. Kronos has a higher abundance of elements such as lithium, magnesium and iron in its atmosphere than in that of Krios. They are the most chemically different binary stars to have been discovered to date. The unusual and rich chemical composition leads scientists to the conclusion that Kronos has destroyed many of its orbiting planets.[8] According to estimates, it might have absorbed at least 15 Earth masses.[3]

See also

References

Wikiwand in your browser!

Seamless Wikipedia browsing. On steroids.

Every time you click a link to Wikipedia, Wiktionary or Wikiquote in your browser's search results, it will show the modern Wikiwand interface.

Wikiwand extension is a five stars, simple, with minimum permission required to keep your browsing private, safe and transparent.