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4643 Cisneros (1990 QD6)
Classification: Main-belt Asteroid          SPK-ID: 2004643
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.

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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .199644950904409 2.6176e-08  
a 2.363670633513874 6.2026e-09 au
q 1.891775725931803 6.1556e-08 au
i 1.775974220924286 3.0337e-06 deg
node 106.8362069515424 0.00010338 deg
peri 188.0624947037397 0.00010375 deg
M 98.96978413284901 7.8937e-06 deg
tp 2458635.595693867937
2.9247e-05 TDB
period 1327.329864953612
n .2712212009277599 1.0676e-09 deg/d
Q 2.835565541095944 7.4409e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2702  
   data-arc span      18820 days (51.53 yr)  
   first obs. used      1968-07-25  
   last obs. used      2020-02-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .46708  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 17:18:12  

Additional Information
 Earth MOID = .875767 au 
 Jupiter MOID = 2.36329 au 
 T_jup = 3.522 
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Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.5   n/a MPO296172  
diameter diameter 5.683 km 0.248 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
rotation period rot_per 5.25 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Chang, C.K.; Ip, W.-H.; Lin, H.-W.; Cheng, Y.C.; et al. (2015) Astrophys. J. Supp. Ser. 219, A27.]
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.262   0.044 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  

4643 Cisneros           Discovered 1990 Aug. 23 by H. E. Holt at Palomar.
Named in honor of Ernest Cisneros (b. 1964), one of the unsung heroes of planetary science. Cisneros began his career as a field geologist but has turned his energies to computer system management, software development, networking and data processing. Throughout the flight portion of the NEAR mission, Ernest insured that key hardware and software elements were developed and implemented. During the flybys of (253) Mathilde and (433) Eros (as well as the earth), Ernest worked with the science team delivering calibrated data within minutes of telemetry arrival for both optical navigation and science analysis. Name proposed by J. Veverka and citation written by M. Robinson.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 19990728/MPCPages.arcLast Updated: 2010-06-11

Alternate Designations
 1990 QD6 = 1957 MF = 1968 OX = 1972 RK2 = 1972 TV3 = 1975 GK1 = 1975 GP1 = 1979 QF7 = 1983 UJ = 1989 EN9 = 1990 QQ5 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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