astro.wikisort.org - Asteroid

Saskia (minor planet designation: 461 Saskia), provisional designation 1900 FP, is a Themistian asteroid from the outer regions of the asteroid belt, approximately 44 kilometers (27 miles) in diameter. It was discovered on 22 October 1900, by German astronomer Max Wolf at the Heidelberg Observatory in southwest Germany.[1] The X-type asteroid has a rotation period of 7.3 hours.[14] It was named after Rembrandt's wife, Saskia van Uylenburgh.[3]

461 Saskia

Discovery [1]
Discovered by	M. F. Wolf
Discovery site	Heidelberg Obs.
Discovery date	22 October 1900
Designations
MPC designation	(461) Saskia
Pronunciation	German: [ˈzaski.aː][2]
Named after	Saskia van Uylenburgh [3] (wife of Rembrandt)
Alternative designations	1900 FP · 1935 CT A917 XE · A924 DB
Minor planet category	main-belt [1][4] · (outer) Themis [5][6]
Orbital characteristics [4]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 0
Observation arc	117.58 yr (42,946 d)
Aphelion	3.5621 AU
Perihelion	2.6834 AU
Semi-major axis	3.1227 AU
Eccentricity	0.1407
Orbital period (sidereal)	5.52 yr (2,016 d)
Mean anomaly	71.934°
Mean motion	0° 10m 42.96s / day
Inclination	1.4634°
Longitude of ascending node	157.03°
Argument of perihelion	305.17°
Physical characteristics
Mean diameter	39.81±13.20 km[7] 43.10±1.05 km[8] 43.603±0.256 km[9][10] 44.1±4.4 km[11]
Synodic rotation period	7.348 h[12][13]
Geometric albedo	0.06[7][11] 0.069[8] 0.112[9]
Spectral type	Tholen = FCX [4][14] X (S3OS2)[5][15] B–V = 0.610±028[4] U–B = 0.310±014[4]
Absolute magnitude (H)	10.48[1][4][8][9][11][16] 10.63[7]

Orbit and classification

Saskia is a core member of the carbonaceous Themis family (602),[5][6] one of the largest asteroid families named after 24 Themis.[17] It orbits the Sun in the outer asteroid belt at a distance of 2.7–3.6 AU once every 5 years and 6 months (2,016 days; semi-major axis of 3.12 AU). Its orbit has an eccentricity of 0.14 and an inclination of 1° with respect to the ecliptic.[4] The body's observation arc begins at Heidelberg the night after its official discovery observation.[1]

Naming

This minor planet was named after Saskia van Uylenburgh (1612–1642), wife of renowned Dutch painter Rembrandt (4511 Rembrandt). The official naming citation was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 50).[3]

Physical characteristics

In the Tholen classification, this asteroid's spectral type is ambiguous, closest to a dark F-type asteroid, and somewhat similar to that of a C- and X-type (FCX),[4] while in both the Tholen- and SMASS-like taxonomy of the Small Solar System Objects Spectroscopic Survey (S3OS2), Saskia is an X-type asteroid.[5][15] It has also been characterized as a primitive P-type asteroid by the Wide-field Infrared Survey Explorer (WISE).[14][16]

Rotation period

In April 2007, a rotational lightcurve of Saskia was obtained from photometric observations by French amateur astronomer Pierre Antonini. Lightcurve analysis gave a well-defined rotation period of 7.348±0.001 hours with a brightness variation of 0.36 magnitude (U=3).[12][14] In December 2016, an identical period with an amplitude of 0.28 magnitude was determined by Daniel Klinglesmith at Etscorn Campus Observatory (719), New Mexico (U=3-).[13] This result supersedes two previous observations that gave a period of 7.34 and 7.349 hours, respectively (U=2/3-).[18][19]

Diameter and albedo

According to the survey carried out by the NEOWISE mission of NASA's WISE telescope, Saskia measures between 39.8 and 44.1 kilometers in diameter and its surface has an albedo between 0.06 and 0.112,[7][9][10][11] while the Japanese Akari satellite determined a diameter of 43.10 kilometers with an albedo of 0.069.[8] The Collaborative Asteroid Lightcurve Link assumes an albedo of 0.10 and derives a smaller diameter of 33.69 kilometers based on an absolute magnitude of 10.48.[14]

References

External links

• Asteroid Lightcurve Database (LCDB), query form (info Archived 16 December 2017 at the Wayback Machine)
• Dictionary of Minor Planet Names, Google books
• Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
• Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
• 461 Saskia at AstDyS-2, Asteroids—Dynamic Site
  • Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
• 461 Saskia at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters

На других языках

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[de] (461) Saskia

(461) Saskia ist ein Asteroid des Hauptgürtels, der am 22. Oktober 1900 vom deutschen Astronomen Max Wolf in Heidelberg entdeckt wurde.

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- [en] 461 Saskia

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[es] (461) Saskia

(461) Saskia es un asteroide perteneciente al cinturón de asteroides descubierto el 22 de octubre de 1900 por Maximilian Franz Wolf desde el observatorio de Heidelberg-Königstuhl, Alemania. Está posiblemente nombrado en honor de Saskia van Uylenburgh (1612-1642), esposa de Rembrandt.[2]

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[ru] (461) Саския

(461) Саския (нидерл. Saskia) — астероид главного пояса, входящий в состав семейства Фемиды. Он был открыт 22 октября 1900 года немецким астрономом Максом Вольфом в обсерватории Хайдельберг в Германии и назван в честь Саскии ван Эйленбюрх, жены знаменитого голландского художника Рембрандта, которую он изобразил на многих своих картинах[1].

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