.png) Lightcurve-based 3D-model of Malmquista | |
| Discovery[1] | |
|---|---|
| Discovered by | Y. Väisälä |
| Discovery site | Turku Obs. |
| Discovery date | 18 October 1939 |
| Designations | |
| (1527) Malmquista | |
Named after | Gunnar Malmquist (astronomer)[2] |
| 1939 UG · 1929 TG 1932 OB · 1972 TK A909 TC | |
| main-belt · Flora[3] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 87.47 yr (31,948 days) |
| Aphelion | 2.6694AU |
| Perihelion | 1.7846 AU |
| 2.2270 AU | |
| Eccentricity | 0.1987 |
| 3.32yr (1,214 days) | |
| 203.99° | |
| 0° 17m 47.76s / day | |
| Inclination | 5.1939° |
| 16.133° | |
| 304.49° | |
| Physical characteristics | |
| Dimensions | 9.55±0.49 km[4] 10.040±0.134 km[5] 10.338±0.071 km[6] 10.80 km(calculated)[3] |
| 14.044±0.0244 h[7] 14.0591 h[8] 14.077±0.004h[9] | |
| 0.2202±0.0169[6] 0.24(assumed)[3] 0.307±0.037[4] | |
| S[3] | |
| 12.0[1][3][4] · 12.2[6] · 12.481±0.002(S)[7] | |
1527 Malmquista (provisional designation1939 UG) is a stony Florianasteroid from the inner regions of theasteroid belt, approximately 10 kilometers in diameter.
It was discovered on 18 October 1939, by Finnish astronomerYrjö Väisälä atTurku Observatory in Southwest Finland.[10] It was named for the Swedish astronomerGunnar Malmquist.[2]
Malmquista is a member of theFlora family, one of the largest families ofstony asteroids in the main belt. It orbits the Sun in theinner main-belt at a distance of 1.8–2.7 AU once every 3 years and 4 months (1,214 days). Its orbit has aneccentricity of 0.20 and aninclination of 5° with respect to theecliptic.[1]In 1909, it was first observed atHeidelberg Observatory asA909 TC. The body'sobservation arc begins atLowell Observatory in 1929, when it was identified as1929 TG, 10 years prior to its official discovery observation at Turku.[10]
In September 2002, a first rotationallightcurve of Malmquista was obtained from photometric observations by Stephen Brincat atFlarestar Observatory on the island of Malta. Lightcurve analysis gave a well-definedrotation period of 14.077 hours with a brightness variation of 0.60magnitude (U=3).[9] In September 2012, observations at thePalomar Transient Factory, California, gave a period of 14.044 hours and an amplitude of 0.42 magnitude (U=2).[7]
In 2013, an international study modeled a lightcurve with a period of 14.0591 hours and found aspin axis of (5.0°, 80.0°) inecliptic coordinates (λ, β) (U=n.a.).[8]
According to the survey carried out by NASA'sWide-field Infrared Survey Explorer with its subsequentNEOWISE mission, Malmquista measures between 9.55 and 10.338 kilometers in diameter and its surface has analbedo between 0.220 and 0.307.[4][5][6] TheCollaborative Asteroid Lightcurve Link assumes an albedo of 0.24 – derived from8 Flora, aS-type asteroid and the family's largest member and namesake – and calculates a diameter of 10.80 kilometers with anabsolute magnitude of 12.0.[3]
Thisminor planet was named after Swedish astronomerGunnar Malmquist (1893–1982), director of theUppsala Astronomical Observatory in Sweden.[2] The officialnaming citation was published by theMinor Planet Center in January 1956 (M.P.C. 1350).[11]
