5656 Oldfield

Short description: Asteroid

5656 OldfieldDiscovery [1]

Discovered by| W. Baade
Discovery site| Bergedorf Obs.
Discovery date| 8 October 1920
Designations

MPC designation

| (5656) Oldfield
Named after| Mike Oldfield [1]
(English musician)

Alternative designations

| A920 TA * 1978 WW18
1981 JZ5
Minor planet category| main-belt [1][2] * (inner)
background [3]
Orbital characteristics [2]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 0
Observation arc| 97.29 yr (35,536 d)
|{{{apsis}}}|helion}}| 3.1076 AU
|{{{apsis}}}|helion}}| 1.8111 AU

Semi-major axis

| 2.4594 AU
Eccentricity| 0.2636
Orbital period| 3.86 yr (1,409 d)
Mean anomaly| 125.66°
Mean motion| 0° 15m 19.8s / day
Inclination| 4.0144°
Longitude of ascending node| 248.67°

|{{{apsis}}}|helion}}

| 83.725°
Physical characteristics
Mean diameter| 7.691±0.051 km[4]
Geometric albedo| 0.075±0.009[4]
Absolute magnitude (H)| 14.1[2]

5656 Oldfield, provisional designation A920 TA, is a background asteroid from the inner regions of the asteroid belt, approximately 7.7 kilometers (4.8 miles) in diameter. It was discovered on 8 October 1920, by astronomer Walter Baade at the Bergedorf Observatory in Hamburg, Germany. The asteroid was named for English musician Mike Oldfield.[1]

## Contents

* 1 Orbit and classification
* 2 Physical characteristics
* 2.1 Diameter and albedo
* 2.2 Rotation period
* 3 Naming
* 4 References
* 5 External links

## Orbit and classification

Oldfield is a non-family asteroid of the main belt's background population.[3] It orbits the Sun in the inner main-belt at a distance of 1.8–3.1 AU once every 3 years and 10 months (1,409 days; semi-major axis of 2.46 AU). Its orbit has an eccentricity of 0.26 and an inclination of 4° with respect to the ecliptic.[2]

The body's observation arc begins at Bergedorf two nights after its official discovery observation.[1]

## Physical characteristics

### Diameter and albedo

According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Oldfield measures 7.691 kilometers in diameter and its surface has an albedo of 0.075.[4]

### Rotation period

As of 2018, no rotational lightcurve of Oldfield has been obtained from photometric observations. The body's rotation period, poles and shape remain unknown.[2]

## Naming

This minor planet was named after English composer and multi-instrumentalist Mike Oldfield (born 1953), creator of the famed Tubular Bells albums.[1] The official naming citation was proposed by Gareth V. Williams and published by the Minor Planet Center on 25 April 1994 (M.P.C. 23353).[5]

## References

1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 "5656 Oldfield (A920 TA)". Minor Planet Center. https://www.minorplanetcenter.net/db_search/show_object?object_id=5656.
2. ↑ 2.0 2.1 2.2 2.3 2.4 "JPL Small-Body Database Browser: 5656 Oldfield (A920 TA)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2005656.
3. ↑ 3.0 3.1 "Asteroid 5656 Oldfield – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. https://newton.spacedys.com/astdys/index.php?pc=1.1.6&n=5656.
4. ↑ 4.0 4.1 4.2 Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Dailey, J. et al. (November 2011). "Main Belt Asteroids with WISE/NEOWISE. I. Preliminary Albedos and Diameters". The Astrophysical Journal 741 (2): 20. doi:10.1088/0004-637X/741/2/68. Bibcode: 2011ApJ...741...68M. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2011ApJ...741...68M. Retrieved 10 April 2018.
5. ↑ "MPC/MPO/MPS Archive". Minor Planet Center. https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html.

## External links

* Asteroid Lightcurve Database (LCDB), query form (info )
* Dictionary of Minor Planet Names, Google books
* Discovery Circumstances: Numbered Minor Planets (5001)-(10000) – Minor Planet Center
* 5656 Oldfield at AstDyS-2, Asteroids—Dynamic Site
* Ephemeris * Observation prediction * Orbital info * Proper elements * Observational info
* 5656 Oldfield at the JPL Small-Body Database
* Close approach * Discovery * Ephemeris * Orbit diagram * Orbital elements * Physical parameters

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