| Discovery[1] | |
|---|---|
| Discovered by | M. F. Wolf |
| Discovery site | Heidelberg Obs. |
| Discovery date | 2 February 1918 |
| Designations | |
| (888) Parysatis | |
| Pronunciation | /pəˈrɪsətɪs/[2] |
Named after | QueenParysatis (Persian Queen)[3] |
| A918 CE · A906 JA A908 YL · A915 JD 1915 JD · 1918 DC 1906 JA · 1908 YL | |
| main-belt[1][4] · (middle) background[5][6] | |
| Orbital characteristics[4] | |
| Epoch 31 May 2020 (JD 2459000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 113.73yr (41,539 d) |
| Aphelion | 3.2357AU |
| Perihelion | 2.1828 AU |
| 2.7093 AU | |
| Eccentricity | 0.1943 |
| 4.46 yr (1,629 d) | |
| 14.339° | |
| 0° 13m 15.6s / day | |
| Inclination | 13.850° |
| 123.94° | |
| 298.11° | |
| Physical characteristics | |
| 5.9314±0.0002 h[10] | |
| 9.4[1][4] | |
888 Parysatis (prov. designation:A918 CEor1918 DC) is a stonybackground asteroid, approximately 44 kilometers (27 miles) in diameter, that is located in the central region of theasteroid belt. It was discovered by German astronomerMax Wolf at theHeidelberg Observatory on 2 February 1918.[1] TheS-type asteroid has arotation period of 5.9 hours. It was named after the Persian QueenParysatis from theAchaemenid Empire of the5th century BC.[3]
Located in or near the region of theEunomia family,[11]Parysatis is a non-family asteroid of the main belt'sbackground population when applying thehierarchical clustering method to itsproper orbital elements.[5][6] It orbits the Sun in thecentral 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 aneccentricity of 0.19 and aninclination of 14° with respect to theecliptic.[4] The body'sobservation arc begins atVienna Observatory on 24 May 1906, almost 12 years prior to its official discovery observation at Heidelberg on 2 February 1918.[1]
Thisminor planet was named after the Persian QueenParysatis of theAchaemenid Empire in the5th century BC. She was the wife of the kingDarius II, and the mother ofArtaxerxes II of Persia, after whom the asteroid831 Stateira was named. Thenaming was also mentioned inThe Names of the Minor Planets byPaul Herget in 1955 (H 86).[3]
In theTholen classification,Parysatis is a common stonyS-type asteroid.[4]
In November 2006, a rotationallightcurve ofParysatis was obtained fromphotometric observations by Serbian astronomer Vladimir Benishek atBelgrade Observatory. Lightcurve analysis gave a well-definedrotation period of5.9314±0.0002 hours with a brightness variation of0.22±0.03magnitude (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) byLaurent 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 of5.931±0.003 hours and an amplitude of0.23±0.03 magnitude was obtained by the Spanish group of asteroid observers, OBAS (U=3).[15]
According to the survey carried out by the JapaneseAkari satellite, the Infrared Astronomical SatelliteIRAS, and theNEOWISE mission of NASA'sWide-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 analbedo of (0.158±0.005), (0.1392±0.009) and (0.139±0.011), respectively.[7][8][9] TheCollaborative Asteroid Lightcurve Link adopts the results obtained by IRAS, that is, an albedo of 0.1392 and a diameter of 44.65 kilometers with anabsolute 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).[6][11]
