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225 Henrietta
	Orbital diagram
Discovery
Discovered by	Johann Palisa
Discovery date	19 April 1882
Designations
MPC designation	(225) Henrietta
Pronunciation	/hɛnriˈɛtə/
Named after	Henrietta Jansen
Alternative designations	A882 HA
Minor planet category	Main belt (Cybele)
Orbital characteristics
	Epoch 31 July 2016 (JD 2457600.5)
	Uncertainty parameter 0
Observation arc	120.87 yr (44,148 d)
Aphelion	4.28364 AU (640.823 Gm)
Perihelion	2.4945 AU (373.17 Gm)
Semi-major axis	3.38907 AU (506.998 Gm)
Eccentricity	0.26396
Orbital period (sidereal)	6.24 yr (2,278.9 d)
Average orbital speed	16.2 km/s
Mean anomaly	159.155°
Mean motion	0° 9m 28.703s / day
Inclination	20.872°
Longitude of ascending node	197.113°
Argument of perihelion	104.149°
Physical characteristics
Dimensions	120.49±2.5 km
Synodic rotation period	7.3556 h (0.30648 d)
Geometric albedo	0.0396±0.002
Spectral type	C
Absolute magnitude (H)	8.72

225 Henrietta is a very large outer main-belt asteroid. It was discovered by Austrian astronomer Johann Palisa on April 19, 1882, in Vienna and named after Henrietta, wife of astronomer Pierre J. C. Janssen.^[2] The asteroid is orbiting at a distance of 3.39 AU from the Sun with a period of 6.24 years and an eccentricity (ovalness) of 0.26. The orbital plane is inclined at an angle of 20.9° to the plane of the ecliptic.^[1] 225 Henrietta belongs to Cybele group of asteroids and is probably in a 4:7 orbital resonance with the planet Jupiter.^[3]

This is classified as a C-type asteroid and is probably composed of primitive carbonaceous material. It has a 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 h 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 h determined in 2000.^[4] 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.^[5]

References

^ ^a ^b "225 Henrietta". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Retrieved 12 May 2016.
^ Schmadel, Lutz D. (2007). "(225) Henrietta". Dictionary of Minor Planet Names. Springer Berlin Heidelberg. p. 35. doi:10.1007/978-3-540-29925-7_226. ISBN 978-3-540-00238-3.
^ Kasuga, Toshihiro; et al. (June 2012). "AKARI/AcuA Physical Studies of the Cybele Asteroid Family". The Astronomical Journal. 143 (6): 11. Bibcode:2012AJ....143..141K. CiteSeerX 10.1.1.430.9746. doi:10.1088/0004-6256/143/6/141. S2CID 121131179. 141.
^ 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.
^ 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 14 April 2015.

External links

The Asteroid Orbital Elements Database
Minor Planet Discovery Circumstances
Asteroid Lightcurve Data File
225 Henrietta at AstDyS-2, Asteroids—Dynamic Site
- Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
225 Henrietta at the JPL Small-Body Database
- Close approach · Discovery · Ephemeris · Orbit viewer · Orbit parameters · Physical parameters

[jpldata-1] "225 Henrietta". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Retrieved 12 May 2016.

[Schmadel2007-2] Schmadel, Lutz D. (2007). "(225) Henrietta". Dictionary of Minor Planet Names. Springer Berlin Heidelberg. p. 35. doi:10.1007/978-3-540-29925-7_226. ISBN 978-3-540-00238-3.

[Kasuga_et_al_2012-3] Kasuga, Toshihiro; et al. (June 2012). "AKARI/AcuA Physical Studies of the Cybele Asteroid Family". The Astronomical Journal. 143 (6): 11. Bibcode:2012AJ....143..141K. CiteSeerX 10.1.1.430.9746. doi:10.1088/0004-6256/143/6/141. S2CID 121131179. 141.

[BMSALPO39_4_213-4] 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.

[icarus186_1_126-5] 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 14 April 2015.

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