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4491 Otaru (1988 RP)
Classification: Main-belt Asteroid          SPK-ID: 2004491
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 27 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .02850993958989361 4.5954e-08  
a 2.173808431417303 6.2482e-09 au
q 2.111833284357595 9.9268e-08 au
i 3.672537818169907 3.2134e-06 deg
node 313.5708863363588 7.1167e-05 deg
peri 71.49974995275333 9.0397e-05 deg
M 291.9870257344901 5.6604e-05 deg
tp 2459221.666628111706
(2021-Jan-07.16662811)
0.00018432 TDB
period 1170.658789444978
3.21
5.0472e-06
1.382e-08
d
yr
n .3075191535278011 1.3259e-09 deg/d
Q 2.235783578477012 6.4263e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2443  
   data-arc span      14354 days (39.30 yr)  
   first obs. used      1980-01-22  
   last obs. used      2019-05-11  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .43606  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-May-30 00:29:14  

Additional Information
 Earth MOID = 1.1163 au 
 Jupiter MOID = 2.8511 au 
 T_jup = 3.683 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.6   n/a MPO365301  
diameter diameter 5.114 km 0.265 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.389   0.114 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
SMASSII spectral type spec_B Sa   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002)

4491 Otaru (1988 RP)          Discovered 1988-Sep-07 by Endate and Watanabe at Kitami
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 1988 RP = 1980 BQ3 = 1985 VJ1 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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