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JPL Small-Body Database Browser
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475 Ocllo (A901 PA)
Classification: Mars-crossing Asteroid          SPK-ID: 2000475
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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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 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3788629181766909 3.8752e-08  
a 2.594860214399394 1.027e-08 au
q 1.611763901311446 9.9928e-08 au
i 18.94334295238938 4.3273e-06 deg
node 34.42167743819136 1.1962e-05 deg
peri 305.8922229632925 1.2613e-05 deg
M 143.6979438364233 5.7575e-06 deg
tp 2458391.078978309391
(2018-Sep-29.57897831)
2.3332e-05 TDB
period 1526.75509441082
4.18
9.0636e-06
2.481e-08
d
yr
n .2357942025658839 1.3998e-09 deg/d
Q 3.577956527487342 1.416e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3261  
   data-arc span      38426 days (105.20 yr)  
   first obs. used      1914-11-20  
   last obs. used      2020-02-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .34675  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 15:28:11  

Additional Information
 Earth MOID = .676468 au 
 Jupiter MOID = 2.103 au 
 T_jup = 3.242 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 11.5   n/a MPO502157  
diameter diameter 17.830 km 5.455 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2016AJ....152...63N)  
rotation period rot_per 7.3151 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Behrend, R. (2007) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Pilcher, F. (2011) Minor Planet Bull. 38, 76-78.]
[Stephens, R.D. (2015) Minor Planet Bull. 42, 104-106.]
geometric albedo albedo 0.057   0.025 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2015ApJ...814..117N)  
B-V BV 0.695   0.064 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=20.91, mean=21.14, max.=21.37) deg.
Tholen spectral type spec_T X   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices

475 Ocllo (A901 PA)          Discovered 1901-Aug-14 by Stewart, D. at Arequipa
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 A901 PA = 1959 JS = 1979 DD 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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