1243 Pamela

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1243 Pamela
Discovery [1]
Discovered by C. Jackson
Discovery site Johannesburg Obs.
Discovery date7 May 1932
Designations
(1243) Pamela
Named after
Pamela Jackson [2]
(discoverer's daughter)
1932 JE ·1929 XD
1934 VL ·1951 AN
1954 JO
main-belt  ·(outer) [3]
background [4]
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc 85.66 yr (31,287 days)
Aphelion 3.2409 AU
Perihelion 2.9512 AU
3.0960 AU
Eccentricity 0.0468
5.45 yr (1,990 days)
165.56°
0° 10m 51.24s / day
Inclination 13.286°
245.68°
56.586°
Physical characteristics
Dimensions66.11±23.05 km [5]
69.883±0.420 km [6]
69.991±1.389 km [7]
70.06 km (derived) [3]
70.07±5.9 km [8]
70.25±1.00 km [9]
70.97±20.63 km [10]
76.42±0.67 km [11]
26.00±0.01 h [12]
26.0±0.1 h [13]
26±0.5 h [13]
26.017±0.003 h [14] [lower-alpha 1]
0.040±0.005 [11]
0.04±0.02 [10]
0.04±0.06 [5]
0.0474 (derived) [3]
0.048±0.002 [9]
0.0483±0.009 [8]
0.0484±0.0102 [7]
C [15]  · C (assumed) [3]
9.60 [10]  ·9.68 [7] [8] [9]  ·9.70 [1] [3] [11]  ·9.71 [5]  ·9.90±0.29 [15]

    1243 Pamela, provisional designation 1932 JE, is a carbonaceous background asteroid from the outer regions of the asteroid belt, approximately 70 kilometers in diameter. It was discovered on 7 May 1932, by South African astronomer Cyril Jackson at the Union Observatory in Johnannesburg. [16] The asteroid was named for Pamela Jackson, daughter of the discoverer. [2]

    Contents

    Orbit and classification

    Pamela is a non-family asteroid from the main belt's background population. [4] It orbits the Sun in the outer main-belt at a distance of 3.0–3.2  AU once every 5 years and 5 months (1,990 days; semi-major axis of 3.10 AU). Its orbit has an eccentricity of 0.05 and an inclination of 13° with respect to the ecliptic. [1]

    The asteroid was first observed at Lowell Observatory in November 1929. The body's observation arc begins at Johannesburg in April 1932, or one month prior to its official discovery observation. [16]

    Physical characteristics

    Pamela has been characterized as a carbonaceous C-type asteroid by Pan-STARRS photometric survey. [15]

    Rotation period

    In October 1999, a first rotational lightcurve of Pamela was obtained from photometric observations by Brian Warner at his Palmer Divide Observatory in Colorado, United States. Lightcurve analysis gave a rotation period of 26.017 hours with a brightness amplitude of 0.49 magnitude ( U=2 ). [14] [lower-alpha 1] Other lightcurves were taken by the Spanish amateur group OBAS in 2015 ( U=2 ), [12] as well as by René Roy and Stéphane Charbonnel in France, and Roberto Crippa and Federico Manzini at Sozzago Astronomical Station ( A12 ) in Piedmont, Italy, between 2005 and 2010 ( U=2/1/2/2- ). [13]

    Diameter and albedo

    According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Pamela measures between 66.11 and 76.42 kilometers in diameter and its surface has an albedo between 0.040 and 0.0484. [5] [6] [7] [8] [9] [10] [11]

    The Collaborative Asteroid Lightcurve Link derives an albedo of 0.0474 and a diameter of 70.06 kilometers based on an absolute magnitude of 9.7. [3]

    Naming

    This minor planet was named after Cyril Jackson's daughter, Pamela Jackson. The official naming citation was mentioned in The Names of the Minor Planets by Paul Herget in 1955 ( H 114 ). [2]

    Notes

    1. 1 2 Lightcurve plot of 1243 Pamela, Palmer Divide Observatory, B. D. Warner (1999). Rotation period 26.017±0.003 hours with a brightness amplitude of 0.49±0.03 mag. Summary figures at the LCDB.

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    References

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