1197 Rhodesia

Asteroid

1197 Rhodesia

Shape model of Rhodesia from its lightcurve

Discovery[1]
Discovered by| C. Jackson
Discovery site| Johannesburg Obs.
Discovery date| 9 June 1931
Designations

MPC designation

| (1197) Rhodesia

Named after

| Rhodesia
(region in southern Africa)

Alternative designations

| 1931 LD * 1925 AC
1970 HL

Minor planet category

| main-belt[1][2] * (outer)
background[3][4]
Orbital characteristics[2]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 0
Observation arc| 93.36 yr (34,098 d)
Aphelion| 3.5511 AU
Perihelion| 2.2215 AU

Semi-major axis

| 2.8863 AU
Eccentricity| 0.2303

Orbital period (sidereal)

| 4.90 yr (1,791 d)

Mean anomaly

| 323.09°

Mean motion

| 0° 12m 3.6s / day
Inclination| 12.985°

Longitude of ascending node

| 255.74°

Argument of perihelion

| 277.16°
Physical characteristics
Dimensions| 48.0 km × 48.0 km[3]

Mean diameter

| 47.50±3.4 km[5]
47.741±0.163 km[6][7]
48.92±0.98 km[8]

Synodic rotation period

| 16.060±0.006 h[9]

Geometric albedo

| 0.070[6]
0.075[8]
0.0783[5]

Spectral type

| B–V = 0.740±030[2][3]
C (assumed)[10]

Absolute magnitude (H)

| 10.00[5][8]
10.18[6][10][11][12]
10.2[1][2]

1197 Rhodesia, provisional designation 1931 LD, is a dark background asteroid from the outer regions of the asteroid belt, approximately 48 kilometers (30 miles) in diameter. It was discovered on 9 June 1931, by South African astronomer Cyril Jackson at the Union Observatory in Johannesburg.[1] The likely C-type asteroid has a rotation period of 16.1 hours.[10] It was named for Rhodesia, a region in southern Africa encompassing Southern Rhodesia (now known as Zimbabwe) and Northern Rhodesia (now known as Zambia).[13]

## Orbit and classification

[edit]

Rhodesia is a non-family asteroid from the main belt's background population.[3][4] It orbits the Sun in the outer asteroid belt at a distance of 2.2–3.6 AU once every 4 years and 11 months (1,791 days; semi-major axis of 2.89 AU). Its orbit has an eccentricity of 0.23 and an inclination of 13° with respect to the ecliptic.[2] The asteroid was first observed at Heidelberg Observatory in January 1925. The body's observation arc also begins at Heidelberg in August 1942, more than 11 years after its official discovery observation at Johannesburg.[1]

## Naming

[edit]

This minor planet was named for the Rhodesia region in southern Africa, what is now Zambia and Zimbabwe. The official naming citation was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 111).[13]

## Physical characteristics

[edit]

Rhodesia is an assumed C-type asteroid which agrees with its albedo and its location in the main belt.[10] It has a B–V color index of 0.740.[2][3]

### Rotation period

[edit]

In December 2017, a rotational lightcurve of Rhodesia was obtained from photometric observations by Tom Polakis at the Command Module Observatory (V02) in Tempe, Arizona. Lightcurve analysis gave a rotation period of 16.060±0.006 hours with a brightness variation of 0.27 magnitude (U=3-).[9] This result refines previous period determinations of 15.89 and 16.062 hours by Richard Binzel (1984) and Laurent Bernasconi (2005), respectively (U=2/2).[12][14]

### Diameter and albedo

[edit]

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, Rhodesia measures between 46.43 and 52.276 kilometers in diameter and its surface has an albedo between 0.0548 and 0.0783.[5][6][7][8][11][15][16] The Collaborative Asteroid Lightcurve Link derives an albedo of 0.0666 and a diameter of 47.40 kilometers based on an absolute magnitude of 10.18.[10] In August 2015, an occultation by Rhodesia determined a cross-section of 48.0 × 48.0 kilometers (no fit).[3]

## References

[edit]

1. ^ a b c d e "1197 Rhodesia (1931 LD)". Minor Planet Center. Retrieved 31 July 2018.
2. ^ a b c d e f "JPL Small-Body Database Browser: 1197 Rhodesia (1931 LD)" (2018-05-24 last obs.). Jet Propulsion Laboratory. Retrieved 31 July 2018.
3. ^ a b c d e f "Asteroid 1197 Rhodesia". Small Bodies Data Ferret. Retrieved 31 July 2018.
4. ^ a b "Asteroid (1197) Rhodesia – Proper elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved 25 May 2018.
5. ^ a b c d Tedesco, E. F.; Noah, P. V.; Noah, M.; Price, S. D. (October 2004). "IRAS Minor Planet Survey V6.0". NASA Planetary Data System – IRAS-A-FPA-3-RDR-IMPS-V6.0: IRAS-A-FPA-3-RDR-IMPS-V6.0. Bibcode:2004PDSS...12.....T. Retrieved 31 July 2018.
6. ^ a b c d Mainzer, A. K.; Bauer, J. M.; Cutri, R. M.; Grav, T.; Kramer, E. A.; Masiero, J. R.; et al. (June 2016). "NEOWISE Diameters and Albedos V1.0". NASA Planetary Data System: EAR-A-COMPIL-5-NEOWISEDIAM-V1.0. Bibcode:2016PDSS..247.....M. Retrieved 31 July 2018.
7. ^ a b Masiero, Joseph R.; Grav, T.; Mainzer, A. K.; Nugent, C. R.; Bauer, J. M.; Stevenson, R.; et al. (August 2014). "Main-belt Asteroids with WISE/NEOWISE: Near-infrared Albedos". The Astrophysical Journal. 791 (2): 11. arXiv:1406.6645. Bibcode:2014ApJ...791..121M. doi:10.1088/0004-637X/791/2/121. S2CID 119293330.
8. ^ a b c d Usui, Fumihiko; Kuroda, Daisuke; Müller, Thomas G.; Hasegawa, Sunao; Ishiguro, Masateru; Ootsubo, Takafumi; et al. (October 2011). "Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey". Publications of the Astronomical Society of Japan. 63 (5): 1117–1138. Bibcode:2011PASJ...63.1117U. doi:10.1093/pasj/63.5.1117. (online, AcuA catalog p. 153)
9. ^ a b Polakis, Tom (April 2018). "Lightcurve Analysis for Eleven Main-belt Asteroids". The Minor Planet Bulletin. 45 (2): 199–203. Bibcode:2018MPBu...45..199P. ISSN 1052-8091.
10. ^ a b c d e "LCDB Data for (1197) Rhodesia". Asteroid Lightcurve Database (LCDB). Retrieved 31 July 2018.
11. ^ a b Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D.; et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results". The Astrophysical Journal. 741 (2): 25. arXiv:1109.6407. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. S2CID 35447010. (catalog)
12. ^ a b Binzel, R. P. (October 1987). "A photoelectric survey of 130 asteroids". Icarus. 72 (1): 135–208. Bibcode:1987Icar...72..135B. doi:10.1016/0019-1035(87)90125-4. ISSN 0019-1035.
13. ^ a b Schmadel, Lutz D. (2007). "(1197) Rhodesia". Dictionary of Minor Planet Names. Springer Berlin Heidelberg. p. 100\. doi:10.1007/978-3-540-29925-7_1198. ISBN 978-3-540-00238-3.
14. ^ Behrend, Raoul. "Asteroids and comets rotation curves – (1197) Rhodesia". Geneva Observatory. Retrieved 31 July 2018.
15. ^ Nugent, C. R.; Mainzer, A.; Masiero, J.; Bauer, J.; Cutri, R. M.; Grav, T.; et al. (December 2015). "NEOWISE Reactivation Mission Year One: Preliminary Asteroid Diameters and Albedos". The Astrophysical Journal. 814 (2): 13. arXiv:1509.02522. Bibcode:2015ApJ...814..117N. doi:10.1088/0004-637X/814/2/117. S2CID 9341381.
16. ^ Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Nugent, C.; et al. (November 2012). "Preliminary Analysis of WISE/NEOWISE 3-Band Cryogenic and Post-cryogenic Observations of Main Belt Asteroids". The Astrophysical Journal Letters. 759 (1): 5. arXiv:1209.5794. Bibcode:2012ApJ...759L...8M. doi:10.1088/2041-8205/759/1/L8. S2CID 46350317.

## External links

[edit]

* 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
* 1197 Rhodesia at AstDyS-2, Asteroids—Dynamic Site
* Ephemeris * Observation prediction * Orbital info * Proper elements * Observational info
* 1197 Rhodesia at the JPL Small-Body Database
* Close approach * Discovery * Ephemeris * Orbit viewer * Orbit parameters * Physical parameters

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