- Daftar planet minor/101–200
- Daftar nomor telepon darurat
- Napoleon Bonaparte
- Daftar negara menurut perbandingan gender dalam populasi
- Wilayah Seberang Laut Britania Raya
- H&M
- Wicca
- Daftar negara menurut jumlah pengguna Internet
- Konstantinus Agung
- Terminator Salvation
- 101 Helena
- 101
- Helena
- Helen of Troy
- Helena, Montana
- James Craig Watson
- Victoria Haralabidou
- Helena Blavatsky
- Moons of Saturn
- List of minor planets: 1–1000
101 Helena GudangMovies21 Rebahinxxi LK21
101 Helena is a large, rocky main-belt asteroid. It was discovered by Canadian-American astronomer J. C. Watson on August 15, 1868, and was named after Helen of Troy in Greek mythology.
This object is orbiting the Sun with a period of 4.16 years and an eccentricity of 0.14. Its orbital plane is inclined by 10.2° to the plane of the ecliptic. Radar observations were made of this object on Oct 7 and 19, 2001 from the Arecibo Observatory. Analysis of the data gave an estimated ellipsoidal diameter of 71×63×63 ± 16% km. The mean diameter estimated from IRAS infrared measurements is 66 km, in agreement with the radar findings. It is classified as an S-type asteroid in the Tholen system, suggesting a predominantly silicate composition. 101 Helena is spinning on its axis with a period of 23 hours.
References
External links
101 Helena at AstDyS-2, Asteroids—Dynamic Site
Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
101 Helena at the JPL Small-Body Database
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