Astronomy:(192642) 1999 RD32

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Short description: Asteroid and suspected contact binary


(192642) 1999 RD32
(192642) 1999 RD32.jpg
Goldstone radar image showing the two lobes of suspected contact binary 1999 RD32.
Discovery[1][2][3]
Discovered byLINEAR
Discovery siteLincoln Lab's ETS
Discovery date8 September 1999
Designations
(192642) 1999 RD32
1999 RD32
Minor planet categoryApollo · NEO · PHA[1][3]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc21.92 yr (8,007 days)
|{{{apsis}}}|helion}}4.6801 AU
|{{{apsis}}}|helion}}0.6093 AU
2.6447 AU
Eccentricity0.7696
Orbital period4.30 yr (1,571 days)
Mean anomaly89.009°
Mean motion0° 13m 45.12s / day
Inclination6.7914°
Longitude of ascending node310.04°
299.89°
Earth MOID0.0495 AU · 19.3 LD
Jupiter MOID0.6702 AU
Physical characteristics
Mean diameter1.63 km (calculated–dated)[4]
5 km (est.–radiometric)[5]
Rotation period17.08±0.03 h[6][lower-alpha 1]
17.1±0.5 h[7]
Geometric albedo0.04 (est.–radiometric)[5]
0.20 (assumed–dated)[4]
C[4][5][8][9]
Absolute magnitude (H)16.00[8] · 16.23±0.01[9] · 16.3[1][4]


(192642) 1999 RD32, provisional designation: 1999 RD32, is an asteroid and suspected contact binary on an eccentric orbit, classified as a large near-Earth object and potentially hazardous asteroid of the Apollo group, approximately 5 kilometers (3 miles) in diameter. It was discovered on 8 September 1999, at a magnitude of 18, by astronomers of the LINEAR program using its 1-meter telescope at the Lincoln Laboratory's Experimental Test Site near Socorro, New Mexico, United States.[3][2] The asteroid is likely of carbonaceous composition and has a rotation period of 17.08 hours.[4][lower-alpha 1]

Description

1999 RD32 orbits the Sun at a distance of 0.6–4.7 AU once every 4 years and 4 months (1,571 days; semi-major axis of 2.64 AU). Its orbit has a high eccentricity of 0.77 and an inclination of 7° with respect to the ecliptic.[1]

The asteroid's observation arc begins with a precovery taken at Palomar Observatory in January 1995.[3] It is known that 1999 RD32 passed 0.0093 astronomical unit|AU (1,390,000 km; 860,000 mi) from Earth on 27 August 1969.[10] During the 1969 close approach the asteroid reached about apparent magnitude 8.8.[11] The similarly-sized 4179 Toutatis also reached that brightness in September 2004. It passed less than 0.007 AU (1,000,000 km; 650,000 mi) from asteroid 29 Amphitrite on 17 January 1939.[1]

Arecibo radar observations on 5–6 March 2012 showed that 1999 RD32 is approximately 5 kilometers (3 mi) in diameter[5] and has an estimated albedo of only 0.04.[5] Other sources calculate a smaller diameter of 1.63 kilometers based on a dated assumption, that the object is a stony rather than a carbonaceous asteroid.[4] The two visible lobes suggest that 1999 RD32 is a tight binary asteroid or contact binary.[5] About 10–15% of near-Earth asteroids larger than 200 meters are expected to be contact binary asteroids with two lobes in mutual contact.[12]

Close-approaches to Earth[10]
Date Distance from Earth
1969-08-27 0.0093 astronomical unit|AU (1,390,000 km; 860,000 mi)
2012-03-14 0.1487 AU (22,250,000 km; 13,820,000 mi)
2042-03-11 0.1428 AU (21,360,000 km; 13,270,000 mi)
2046-09-04 0.1071 AU (16,020,000 km; 9,960,000 mi)
History of close approaches of large near-Earth objects since 1908 (A)
PHA Date Approach distance (lunar dist.) Abs.
mag
(H) 		Diameter (C)
(m) 		Ref (D)
Nomi-
nal(B) 		Mini-
mum 		Maxi-
mum
(33342) 1998 WT24 1908-12-16 3.542 3.537 3.547 17.9 556–1795 data
(458732) 2011 MD5 1918-09-17 0.911 0.909 0.913 17.9 556–1795 data
(7482) 1994 PC1 1933-01-17 2.927 2.927 2.928 16.8 749–1357 data
69230 Hermes 1937-10-30 1.926 1.926 1.927 17.5 668–2158 data
69230 Hermes 1942-04-26 1.651 1.651 1.651 17.5 668–2158 data
(137108) 1999 AN10 1946-08-07 2.432 2.429 2.435 17.9 556–1795 data
(33342) 1998 WT24 1956-12-16 3.523 3.523 3.523 17.9 556–1795 data
(163243) 2002 FB3 1961-04-12 4.903 4.900 4.906 16.4 1669–1695 data
(192642) 1999 RD32 1969-08-27 3.627 3.625 3.630 16.3 1161–3750 data
(143651) 2003 QO104 1981-05-18 2.761 2.760 2.761 16.0 1333–4306 data
2017 CH1 1992-06-05 4.691 3.391 6.037 17.9 556–1795 data
(170086) 2002 XR14 1995-06-24 4.259 4.259 4.260 18.0 531–1714 data
(33342) 1998 WT24 2001-12-16 4.859 4.859 4.859 17.9 556–1795 data
4179 Toutatis 2004-09-29 4.031 4.031 4.031 15.30 2440–2450 data
2014 JO25 2017-04-19 4.573 4.573 4.573 17.8 582–1879 data
(137108) 1999 AN10 2027-08-07 1.014 1.010 1.019 17.9 556–1795 data
(35396) 1997 XF11 2028-10-26 2.417 2.417 2.418 16.9 881–2845 data
(154276) 2002 SY50 2071-10-30 3.415 3.412 3.418 17.6 714–1406 data
(164121) 2003 YT1 2073-04-29 4.409 4.409 4.409 16.2 1167–2267 data
(385343) 2002 LV 2076-08-04 4.184 4.183 4.185 16.6 1011–3266 data
(52768) 1998 OR2 2079-04-16 4.611 4.611 4.612 15.8 1462–4721 data
(33342) 1998 WT24 2099-12-18 4.919 4.919 4.919 17.9 556–1795 data
(85182) 1991 AQ 2130-01-27 4.140 4.139 4.141 17.1 1100 data
314082 Dryope 2186-07-16 3.709 2.996 4.786 17.5 668–2158 data
(137126) 1999 CF9 2192-08-21 4.970 4.967 4.973 18.0 531–1714 data
(290772) 2005 VC 2198-05-05 1.951 1.791 2.134 17.6 638–2061 data
(A) List includes near-Earth approaches of less than 5 lunar distances (LD) of objects with H brighter than 18.
(B) Nominal geocentric distance from the Earth's center to the object's center (earth radius≈6400 km).
(C) Diameter: estimated, theoretical mean-diameter based on H and albedo range between X and Y.
(D) Reference: data source from the JPL SBDB, with AU converted into LD (1 AU≈390 LD)
(E) Color codes:   unobserved at close approach   observed during close approach   upcoming approaches

Numbering and naming

This minor planet was numbered by the Minor Planet Center on 13 November 2008.[13] As of 2018, it has not been named.[3]

Notes

  1. ↑ 1.0 1.1 Lightcurve plot of (192642) 1999 RD32, Palmer Divide Observatory, B. D. Warner (2012): rotation period 17.08±0.03 hours with a brightness amplitude of 0.28±0.02 mag. Summary figures at the LCDB

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 "JPL Small-Body Database Browser: 192642 (1999 RD32)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2192642. Retrieved 16 January 2018. 
  2. ↑ 2.0 2.1 "MPEC 1999-R32 : 1999 RD32". IAU Minor Planet Center. 1999-09-11. https://minorplanetcenter.net/mpec/J99/J99R32.html. Retrieved 2014-02-28.  (J99R32D)
  3. ↑ 3.0 3.1 3.2 3.3 3.4 "192642 (1999 RD32)". Minor Planet Center. https://www.minorplanetcenter.net/db_search/show_object?object_id=192642. Retrieved 16 January 2018. 
  4. ↑ 4.0 4.1 4.2 4.3 4.4 4.5 "LCDB Data for (192642)". Asteroid Lightcurve Database (LCDB). http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=192642%7C. Retrieved 16 January 2018. 
  5. ↑ 5.0 5.1 5.2 5.3 5.4 5.5 "(192642) 1999 RD32 Goldstone Radar Observations Planning". NASA/JPL Asteroid Radar Research. 12 March 2012. http://echo.jpl.nasa.gov/asteroids/1999RD32/1999RD32_planning.html. Retrieved 16 January 2018. 
  6. ↑ Warner, Brian D.; Megna, Ralph (July 2012). "Lightcurve Analysis of NEA (192642) 1999 RD32". The Minor Planet Bulletin 39 (3): 154. ISSN 1052-8091. Bibcode: 2012MPBu...39..154W. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2012MPBu...39..154W. Retrieved 16 January 2018. 
  7. ↑ Vaduvescu, O.; Macias, A. Aznar; Tudor, V.; Predatu, M.; Galád, A.; Gajdos, S. et al. (August 2017). "The EURONEAR Lightcurve Survey of Near Earth Asteroids". Earth 120 (2): 41–100. doi:10.1007/s11038-017-9506-9. Bibcode: 2017EM&P..120...41V. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2017EM&P..120...41V. Retrieved 16 January 2018. 
  8. ↑ 8.0 8.1 Carry, B.; Solano, E.; Eggl, S.; DeMeo, F. E. (April 2016). "Spectral properties of near-Earth and Mars-crossing asteroids using Sloan photometry". Icarus 268: 340–354. doi:10.1016/j.icarus.2015.12.047. Bibcode: 2016Icar..268..340C. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2016Icar..268..340C. Retrieved 16 January 2018. 
  9. ↑ 9.0 9.1 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 16 January 2018. 
  10. ↑ 10.0 10.1 "JPL Close-Approach Data: 192642 (1999 RD32)". https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=1999RD32;cad=1#cad. Retrieved 2014-02-28. 
  11. ↑ "1999RD32 Ephemerides for 25 August 1969 through 31 August 1969". NEODyS (Near Earth Objects – Dynamic Site). http://newton.spacedys.com/neodys/index.php?pc=1.1.3.1&n=192642&oc=500&y0=1969&m0=8&d0=25&h0=0&mi0=0&y1=1969&m1=8&d1=31&h1=0&mi1=0&ti=3.0&tiu=hours. Retrieved 2014-02-28. 
  12. ↑ Michael Busch (2012-03-12). "Near-Earth Asteroids and Radar Speckle Tracking". http://www.aoc.nrao.edu/events/nmsymposium/2012/talks/Busch_2012_New_Mexico_Symposium.pdf. Retrieved 2014-02-28. 
  13. ↑ "MPC/MPO/MPS Archive". Minor Planet Center. https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html. Retrieved 24 February 2018. 

External links



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