3204 Lindgren
Main-belt asteroid
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3204 Lindgren, provisional designation 1978 RH, is a carbonaceous background asteroid from the outer regions of the asteroid belt, approximately 20 kilometers (12 miles) in diameter. It was discovered on 1 September 1978, by Soviet astronomer Nikolai Chernykh at the Crimean Astrophysical Observatory in Nauchnij, on the Crimean peninsula.[1] The B-type asteroid has a rotation period of 5.6 hours.[8] It was named after Swedish writer Astrid Lindgren.[1]
| Discovery[1] | |
|---|---|
| Discovered by | N. Chernykh |
| Discovery site | Crimean Astrophysical Obs. |
| Discovery date | 1 September 1978 |
| Designations | |
| (3204) Lindgren | |
Named after | Astrid Lindgren[1] (Swedish writer) |
| 1978 RH · 1980 CQ 1980 DM | |
| main-belt[1][2] · (outer) background[3] | |
| Orbital characteristics[2] | |
| Epoch 23 March 2018 (JD 2458200.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 39.06 yr (14,266 d) |
| Aphelion | 4.0411 AU |
| Perihelion | 2.2764 AU |
| 3.1588 AU | |
| Eccentricity | 0.2793 |
| 5.61 yr (2,051 d) | |
| 327.09° | |
| 0° 10m 32.16s / day | |
| Inclination | 2.0630° |
| 108.70° | |
| 298.30° | |
| Physical characteristics | |
| 18.95±0.80 km[4] 19.596±0.248 km[5][6] 20.2±2.0 km[7] 20.21 km (calculated)[8] 21±2 km[9] | |
| 5.614±0.0047 h[10] 5.618±0.0047 h[10] | |
| 0.05±0.01[9] 0.057 (assumed)[8] 0.06±0.01[7] 0.0606±0.0151[6] 0.063±0.007[5] 0.065±0.006[4] | |
| B (S3OS2)[11] C (assumed)[8] | |
| 12.10[7] 12.170±0.001 (R)[10] 12.20[2][4][6][8][9] 12.35±0.23[12] 12.582±0.001 (S)[10] | |
Orbit and classification
Lindgren is a non-family asteroid from the main belt's background population.[3] It orbits the Sun in the outer asteroid belt at a distance of 2.3–4.0 AU once every 5 years and 7 months (2,051 days; semi-major axis of 3.16 AU). Its orbit has an eccentricity of 0.28 and an inclination of 2° with respect to the ecliptic.[2] The body's observation arc begins with its official discovery observation at Nauchnij in 1978.[1]
Physical characteristics
Lindgren has been characterized as a "bright" carbonaceous B-type asteroid in both the Tholen-like and SMASS-like taxonomy of the Small Solar System Objects Spectroscopic Survey (S3OS2).[11] It is also an assumed C-type asteroid.[8]
Rotation period
In August 2012, two rotational lightcurves of Lindgren were obtained from photometric observations by astronomers at the Palomar Transient Factory in California. Lightcurve analysis gave a rotation period of 5.614 and 5.618 hours with a brightness amplitude of 0.15 magnitude in the S- and R-band, respectively (U=2/2).[10]
Diameter and albedo
According to the surveys carried out by the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Lindgren measures between 19 and 21 kilometers in diameter and its surface has an albedo between 0.05 and 0.065.[4][5][6][7][9]
The Collaborative Asteroid Lightcurve Link assumes a standard albedo for a carbonaceous asteroid of 0.057 and calculates a diameter of 20.21 kilometers based on an absolute magnitude of 12.2.[8]
Naming
This minor planet was named after Swedish writer Astrid Lindgren (1907–2002), a recipient of the Hans Christian Andersen Award and known for her children's books such as Pippi Longstocking.[1] The official naming citation was published by the Minor Planet Center on 2 April 1988 (M.P.C. 12971).[13]
