888 Parysatis

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888 Parysatis
Discovery [1]
Discovered byM. F. Wolf
Discovery siteHeidelberg Obs.
Discovery date2 February 1918
(888) Parysatis
Named after
Queen Parysatis
(Persian Queen)[2]
A918 CE · A906 JA
A908 YL · A915 JD
1915 JD · 1918 DC
1906 JA · 1908 YL
main-belt[1][3] · (middle)
Orbital characteristics[3]
Epoch 31 May 2020 (JD 2459000.5)
Uncertainty parameter 0
Observation arc113.73 yr (41,539 d)
Aphelion3.2357 AU
Perihelion2.1828 AU
2.7093 AU
4.46 yr (1,629 d)
0° 13m 15.6s / day
Physical characteristics
Mean diameter
  • 42.18±0.50 km[7]
  • 44.65±1.4 km[8]
  • 44.749±0.370 km[9]
5.9314±0.0002 h[10]
  • 0.139±0.011[9]
  • 0.1392±0.009[8]
  • 0.158±0.005[7]

888 Parysatis (prov. designation: A918 CE or 1918 DC) is a stony background asteroid, approximately 44 kilometers (27 miles) in diameter, that is located in the central region of the asteroid belt. It was discovered by German astronomer Max Wolf at the Heidelberg Observatory on 2 February 1918.[1] The S-type asteroid has a rotation period of 5.9 hours. It was named after the Persian Queen Parysatis from the Achaemenid Empire of the 5th century BC.[2]

Orbit and classification[edit]

Located in or near the region of the Eunomia family,[11] Parysatis is a non-family asteroid of the main belt's background population when applying the hierarchical clustering method to its proper orbital elements.[4][5] It orbits the Sun in the central asteroid belt at a distance of 2.2–3.2 AU once every 4 years and 6 months (1,629 days; semi-major axis of 2.71 AU). Its orbit has an eccentricity of 0.19 and an inclination of 14° with respect to the ecliptic.[3] The body's observation arc begins at Vienna Observatory on 24 May 1906, almost 12 years prior to its official discovery observation at Heidelberg on 2 February 1918.[1]


This minor planet was named after the Persian Queen Parysatis of the Achaemenid Empire in the 5th century BC. She was the wife of the king Darius II, and the mother of Artaxerxes II of Persia, after whom the asteroid 831 Stateira was named. The naming was also mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 86).[2]

Physical characteristics[edit]

In the Tholen classification, Parysatis is a common stony S-type asteroid.[3]

Rotation period[edit]

In November 2006, a rotational lightcurve of Parysatis was obtained from photometric observations by Serbian astronomer Vladimir Benishek at Belgrade Observatory. Lightcurve analysis gave a well-defined rotation period of 5.9314±0.0002 hours with a brightness variation of 0.22±0.03 magnitude (U=3).[10][11] The result supersedes other period determinations of (5.49±0.01 h) by Marcos Florczak in 1996,[12] (5.928±0.006 h) by Laurent Bernasconi in 2003,[13] and (5.933±0.001 h) by Michael Fleenor in 2006,[14] and by Andy Monson in 2011 (U=2/3−/3−/2).[11]

In April 2017, another lightcurve with a well-defined period of 5.931±0.003 hours and an amplitude of 0.23±0.03 magnitude was obtained by the Spanish group of asteroid observers, OBAS (U=3).[15]

Diameter and albedo[edit]

According to the survey carried out by the Japanese Akari satellite, the Infrared Astronomical Satellite IRAS, and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer (WISE), Parysatis measures (42.18±0.50), (44.65±1.4) and (44.749±0.370) kilometers in diameter and its surface has an albedo of (0.158±0.005), (0.1392±0.009) and (0.139±0.011), respectively.[7][8][9] The Collaborative Asteroid Lightcurve Link adopts the results obtained by IRAS, that is, an albedo of 0.1392 and a diameter of 44.65 kilometers with an absolute magnitude of 9.51.[11] Alternative mean-diameter measurements published by the WISE team include (36.24±10.36 km), (41.65±0.49 km) and (46.189±0.607 km) with corresponding albedos of (0.21±0.13), (0.160±0.020) and (0.1300±0.0424).[5][11]


  1. ^ a b c d e "888 Parysatis (A918 CE)". Minor Planet Center. Retrieved 26 February 2020.
  2. ^ a b c Schmadel, Lutz D. (2007). "(888) Parysatis". Dictionary of Minor Planet Names. Springer Berlin Heidelberg. p. 80. doi:10.1007/978-3-540-29925-7_889. ISBN 978-3-540-00238-3.
  3. ^ a b c d e f g h "JPL Small-Body Database Browser: 888 Parysatis (A918 CE)" (2020-02-03 last obs.). Jet Propulsion Laboratory. Retrieved 26 February 2020.
  4. ^ a b "Asteroid 888 Parysatis – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved 26 February 2020.
  5. ^ a b c "Asteroid 888 Parysatis". Small Bodies Data Ferret. Retrieved 26 February 2020.
  6. ^ Noah Webster (1884) A Practical Dictionary of the English Language
  7. ^ a b c Usui, Fumihiko; Kuroda, Daisuke; Müller, Thomas G.; Hasegawa, Sunao; Ishiguro, Masateru; Ootsubo, Takafumi; et al. (October 2011). "Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey". Publications of the Astronomical Society of Japan. 63 (5): 1117–1138. Bibcode:2011PASJ...63.1117U. doi:10.1093/pasj/63.5.1117. (online, AcuA catalog p. 153)
  8. ^ a b c Tedesco, E. F.; Noah, P. V.; Noah, M.; Price, S. D. (October 2004). "IRAS Minor Planet Survey V6.0". NASA Planetary Data System. 12: IRAS-A-FPA-3-RDR-IMPS-V6.0. Bibcode:2004PDSS...12.....T. Retrieved 26 February 2020.
  9. ^ a b c Masiero, Joseph R.; Grav, T.; Mainzer, A. K.; Nugent, C. R.; Bauer, J. M.; Stevenson, R.; et al. (August 2014). "Main-belt Asteroids with WISE/NEOWISE: Near-infrared Albedos". The Astrophysical Journal. 791 (2): 11. arXiv:1406.6645. Bibcode:2014ApJ...791..121M. doi:10.1088/0004-637X/791/2/121.
  10. ^ a b Benishek, Vladimir (March 2008). "CCD Photometry of Seven Asteroids at the Belgrade Astronomical Observatory" (PDF). Minor Planet Bulletin. 35 (1): 28–30. Bibcode:2008MPBu...35...28B. ISSN 1052-8091.
  11. ^ a b c d e "LCDB Data for (888) Parysatis". Asteroid Lightcurve Database (LCDB). Retrieved 26 February 2020.
  12. ^ Florczak, M.; Dotto, E.; Barucci, M. A.; Birlan, M.; Erikson, A.; Fulchignoni, M.; et al. (November 1997). "Rotational properties of main belt asteroids: photoelectric and CCD observations of 15 objects". Planetary and Space Science. 45 (11): 1423–1435. Bibcode:1997P&SS...45.1423F. doi:10.1016/S0032-0633(97)00121-9. ISSN 0032-0633.
  13. ^ Behrend, Raoul. "Asteroids and comets rotation curves – (888) Parysatis". Geneva Observatory. Retrieved 26 February 2020.
  14. ^ Fleenor, Michael L. (September 2007). "Asteroid Lightcurve Analysis from Volunteer Observatory December 2006 to April 2007" (PDF). Minor Planet Bulletin. 34 (3): 66–67. Bibcode:2007MPBu...34...66F. ISSN 1052-8091.
  15. ^ Mas, Vicente; Fornas, G.; Lozano, Juan; Rodrigo, Onofre; Fornas, A.; Carreño, A.; et al. (January 2018). "Twenty-one Asteroid Lightcurves at Asteroids Observers (OBAS) - MPPD: Nov 2016 - May 2017" (PDF). Minor Planet Bulletin. 45 (1): 76–82. Bibcode:2018MPBu...45...76M. ISSN 1052-8091.

External links[edit]