225 Henrietta

225 Henrietta
Discovery
Discovered by Johann Palisa
Discovery date April 19, 1882
Designations
n/a
Main belt (Cybele)
Orbital characteristics
Epoch 30 January 2005 (JD 2453400.5)
Aphelion 641.471 Gm (4.288 AU)
Perihelion 370.46 Gm (2.476 AU)
505.966 Gm (3.382 AU)
Eccentricity 0.268
2271.87 d (6.22 a)
16.2 km/s
215.046°
Inclination 20.902°
197.199°
104.697°
Physical characteristics
Dimensions 121.0 km
7.356 h
Albedo .040
Spectral type
 C
8.72

    225 Henrietta is a very large outer main-belt asteroid. It was discovered by Johann Palisa on April 19, 1882, in Vienna and named after Henrietta, wife of astronomer Pierre J. C. Janssen.

    This is classified as a C-type asteroid and is probably composed of privitive carbonaceous material. It has very dark surface, with an albedo of 0.040. Photometric measurements made from the Oakley Southern Sky Observatory during 2012 gave a light curve with a period of 7.352 ± 0.003 hours and a variation in brightness of 0.18 ± 0.02 in magnitude. This is consistent with a synodic rotation period of 7.356 ± 0.001 hours determined in 2000.[1]

    In 2001, the asteroid was detected by radar from the Arecibo Observatory at a distance of 1.58 AU. The resulting data yielded an effective diameter of 128 ± 16 km.[2]

    225 Henrietta belongs to Cybele group of asteroids and is probably in a 4:7 orbital resonance with the planet Jupiter.

    References

    1. ↑ Moravec, Patricia; Cochren, Joseph; Gerhardt, Michael; et al. (October 2012), "Asteroid Lightcurve Analysis at the Oakley Southern Sky Observatory: 2012 January-April", The Minor Planet Bulletin 39 (4): 213–216, Bibcode:2012MPBu...39..213M.
    2. ↑ Magri, Christopher; et al. (January 2007), "A radar survey of main-belt asteroids: Arecibo observations of 55 objects during 1999 2003" (PDF), Icarus 186 (1): 126–151, Bibcode:2007Icar..186..126M, doi:10.1016/j.icarus.2006.08.018, retrieved 2015-04-14.

    External links


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