astro.wikisort.org - Asteroid
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]
| Discovery | |
|---|---|
| Discovered by | Johann Palisa |
| Discovery date | 19 April 1882 |
| Designations | |
MPC designation | (225) Henrietta |
| Pronunciation | /hɛnriˈɛtə/ |
Alternative designations | A882 HA |
Minor planet category | Main belt (Cybele) |
| Orbital characteristics[1] | |
| 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 |
This is classified as a C-type asteroid and is probably composed of primitive 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 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
- "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 – (225) Henrietta. 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. doi:10.1088/0004-6256/143/6/141. 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
- 225 Henrietta at the JPL Small-Body Database
На других языках
[de] (225) Henrietta
(225) Henrietta ist ein Asteroid des äußeren Asteroiden-Hauptgürtels, der am 19. April 1882 von Johann Palisa am Observatorium von Wien entdeckt wurde. Der Asteroid wurde nach der Frau des Astronomen Pierre Jules César Janssen benannt.- [en] 225 Henrietta
[es] (225) Henrietta
(225) Henrietta es un asteroide perteneciente al cinturón exterior de asteroides descubierto el 19 de abril de 1882 por Johann Palisa desde el observatorio de Viena, Austria. Está nombrado en honor de la esposa del astrónomo francés Pierre J. C. Janssen (1824-1907).[3][ru] (225) Генриетта
(225) Генриетта (фр. Henrietta) — крупный астероид главного пояса, который принадлежит к редкому спектральному классу F и имеет очень тёмную поверхность, что говорит о присутствии в её составе большого количества углеродных соединений. Он был обнаружен 19 апреля 1882 года австрийским астрономом Иоганном Пализой в обсерватории города Вена и назван в честь Генриетты, жены французского астронома Пьера Жансена[1].Другой контент может иметь иную лицензию. Перед использованием материалов сайта WikiSort.org внимательно изучите правила лицензирования конкретных элементов наполнения сайта.
WikiSort.org - проект по пересортировке и дополнению контента Википедии