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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 36 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .02832428797837373 1.8051e-08  
a 2.173172913488731 4.8353e-09 au
q 2.111619338060275 4.0602e-08 au
i 3.672745484772666 3.2718e-07 deg
node 313.5716829907187 7.5282e-06 deg
peri 71.96701224171277 1.9866e-05 deg
M 353.0429259937476 1.7221e-05 deg
tp 2459223.113301560008
(2021-Jan-08.61330156)
5.5993e-05 TDB
period 1170.145459756041
3.20
3.9053e-06
1.069e-08
d
yr
n .3076540587313435 1.0268e-09 deg/d
Q 2.234726488917187 4.9722e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3209  
   data-arc span      15020 days (41.12 yr)  
   first obs. used      1980-01-22  
   last obs. used      2021-03-07  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .41028  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 16:24:39  

Additional Information
 Earth MOID = 1.1147 au 
 Jupiter MOID = 2.85014 au 
 T_jup = 3.684 
[ 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 13.70   n/a E2021B10  
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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