Astronomy:1325 Inanda

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1325 Inanda
Discovery[1]
Discovered byC. Jackson
Discovery siteJohannesburg Obs.
Discovery date14 July 1934
Designations
(1325) Inanda
Named afterInanda[2]
(South African township)
1934 NR · 1926 RP
1930 OD
Minor planet categorymain-belt · (middle)
background[3]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc82.80 yr (30,241 days)
|{{{apsis}}}|helion}}3.1900 AU
|{{{apsis}}}|helion}}1.8917 AU
2.5408 AU
Eccentricity0.2555
Orbital period4.05 yr (1,479 days)
Mean anomaly165.02°
Mean motion0° 14m 36.24s / day
Inclination7.4205°
Longitude of ascending node14.393°
336.80°
Physical characteristics
Dimensions9.97±2.30 km[4]
10.87±0.6 km[5]
10.890±0.110 km[6][7]
12.34±0.61 km[8]
Rotation period20.52±0.05 h[9][lower-alpha 1]
24 h (poor)[10]
141.6±0.2 h (poor)[11]
Geometric albedo0.20±0.13[4]
0.303±0.034[8]
0.374±0.041[6]
0.3742±0.0407[7]
0.3756±0.043[5]
S[12][13]
Absolute magnitude (H)11.50[5][7][8][12] · 11.66±0.28[13] · 12.2[1] · 12.37[4]


1325 Inanda, provisional designation 1934 NR, is a stony background asteroid from the central regions of the asteroid belt, approximately 11 kilometers in diameter. It was discovered on 14 July 1934, by South African astronomer Cyril Jackson at the Union Observatory in Johannesburg.[14] The asteroid was named after the township of Inanda in South Africa.[2]

Orbit and classification

Inanda is a non-family asteroid of the main belt's background population.[3] It orbits the Sun in the central main-belt at a distance of 1.9–3.2 AU once every 4 years and 1 month (1,479 days; semi-major axis of 2.54 AU). Its orbit has an eccentricity of 0.26 and an inclination of 7° with respect to the ecliptic.[1]

The asteroid was first identified as 1926 RP at Johannesburg in September 1926. The body's observation arc begins with its official discovery observation in July 1934.[14]

Physical characteristics

Inanda has been characterized as a stony, common S-type asteroid by Pan-STARRS photometric survey.[12][13]

Rotation period

In November 2007, a rotational lightcurve of Inanda was obtained from photometric observations by American astronomer Brian Warner at his Palmer Divide Observatory in Colorado. Lightcurve analysis gave an ambiguous rotation period of 20.52 hours with an alternative period solution of 35.83 hours and a brightness amplitude of 0.12 magnitude ({{{1}}}).[9][lower-alpha 1] The results supersede previous observations that gave a fragmentary lightcurve with a period of 24 and 141.6 hours respectively ({{{1}}}).[10][11]

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, Inanda measures between 9.97 and 12.34 kilometers in diameter and its surface has an albedo between 0.20 and 0.3756.[4][5][6][7][8]

The Collaborative Asteroid Lightcurve Link adopts the results obtained by IRAS, that is, an albedo of 0.3756 and a diameter of 10.87 kilometers based on an absolute magnitude of 11.5.[12]

Occultation

On 12 November 2007, an occultation suggested that Inanda could be a binary asteroid.[15] However, the asteroid's suspected binary nature has not been mentioned in other studies since then.[12][16]

Naming

This minor planet was named after the South African, Zulu-speaking Township of Inanda, KwaZulu-Natal. The official naming citation was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 121).[2]

Notes

  1. ↑ 1.0 1.1 Lightcurve plot of 1325 Inanda, Palmer Divide Observatory, B. D. Warner (2007), with a period of 20.52±0.05 hours and a brightness amplitude of 0.12±0.01 magnitude.[9] Summary figures for (1325) Inanda at Collaborative Asteroid Lightcurve Link (CALL)

References

  1. ↑ 1.0 1.1 1.2 1.3 "JPL Small-Body Database Browser: 1325 Inanda (1934 NR)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001325. 
  2. ↑ 2.0 2.1 2.2 Schmadel, Lutz D. (2007). "(1325) Inanda". Dictionary of Minor Planet Names – (1325) Inanda. Springer Berlin Heidelberg. p. 108. doi:10.1007/978-3-540-29925-7_1326. ISBN 978-3-540-00238-3. 
  3. ↑ 3.0 3.1 "Asteroid 1325 Inanda – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. https://newton.spacedys.com/astdys/index.php?pc=1.1.6&n=1325. 
  4. ↑ 4.0 4.1 4.2 4.3 Nugent, C. R.; Mainzer, A.; Bauer, J.; Cutri, R. M.; Kramer, E. A.; Grav, T. et al. (September 2016). "NEOWISE Reactivation Mission Year Two: Asteroid Diameters and Albedos". The Astronomical Journal 152 (3): 12. doi:10.3847/0004-6256/152/3/63. Bibcode: 2016AJ....152...63N. 
  5. ↑ 5.0 5.1 5.2 5.3 Tedesco, E. F.; Noah, P. V.; Noah, M.; Price, S. D. (October 2004). "IRAS Minor Planet Survey V6.0". NASA Planetary Data System 12: IRAS-A-FPA-3-RDR-IMPS-V6.0. Bibcode: 2004PDSS...12.....T. https://sbnarchive.psi.edu/pds3/iras/IRAS_A_FPA_3_RDR_IMPS_V6_0/data/diamalb.tab. Retrieved 22 October 2019. 
  6. ↑ 6.0 6.1 6.2 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 5 December 2017. 
  7. ↑ 7.0 7.1 7.2 7.3 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. doi:10.1088/0004-637X/741/2/90. Bibcode: 2011ApJ...741...90M. 
  8. ↑ 8.0 8.1 8.2 8.3 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. doi:10.1093/pasj/63.5.1117. Bibcode: 2011PASJ...63.1117U.  (online, AcuA catalog p. 153)
  9. ↑ 9.0 9.1 9.2 Warner, Brian D. (June 2008). "Asteroid Lightcurve Analysis at the Palmer Divide Observatory: September-December 2007". The Minor Planet Bulletin 35 (2): 67–71. ISSN 1052-8091. Bibcode: 2008MPBu...35...67W. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2008MPBu...35...67W. Retrieved 5 December 2017. 
  10. ↑ 10.0 10.1 Warner, B. (March 2000). "Asteroid Photometry at the Palmer Divide Observatory". The Minor Planet Bulletin 27: 4–6. Bibcode: 2000MPBu...27....4W. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2000MPBu...27....4W. Retrieved 5 December 2017. 
  11. ↑ 11.0 11.1 Menke, John; Cooney, Walt; Gross, John; Terrell, Dirk; Higgins, David (October 2008). "Asteroid Lightcurve Analysis at Menke Observatory". The Minor Planet Bulletin 35 (4): 155–160. ISSN 1052-8091. Bibcode: 2008MPBu...35..155M. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2008MPBu...35..155M. Retrieved 5 December 2017. 
  12. ↑ 12.0 12.1 12.2 12.3 12.4 "LCDB Data for (1325) Inanda". Asteroid Lightcurve Database (LCDB). http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=1325%7CInanda. 
  13. ↑ 13.0 13.1 13.2 Veres, Peter; Jedicke, Robert; Fitzsimmons, Alan; Denneau, Larry; Granvik, Mikael; Bolin, Bryce et al. (November 2015). "Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results". Icarus 261: 34–47. doi:10.1016/j.icarus.2015.08.007. Bibcode: 2015Icar..261...34V. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015Icar..261...34V. Retrieved 5 December 2017. 
  14. ↑ 14.0 14.1 "1325 Inanda (1934 NR)". Minor Planet Center. https://www.minorplanetcenter.net/db_search/show_object?object_id=1325. 
  15. ↑ Brad Timerson (19 February 2008). "2007 Asteroid Occultation Results for North America". www.asteroidoccultation.com. http://www.asteroidoccultation.com/observations/Results/index2007.html. 
  16. ↑ Robert Johnston (18 February 2017). "Asteroids with Satellites". Johnston's Archive. http://www.johnstonsarchive.net/astro/asteroidmoons.html. 

External links



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