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JPL Small-Body Database Browser
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1638 Ruanda (1935 JF)
Classification: Main-belt Asteroid          SPK-ID: 2001638
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 42 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1876015163473976 3.1938e-08  
a 2.750616677077481 9.5054e-09 au
q 2.234596817567306 8.7359e-08 au
i .2927333774703682 3.6134e-06 deg
node 200.5525928304789 0.00072116 deg
peri 86.43871162729187 0.00072123 deg
M 204.0352853953655 1.208e-05 deg
tp 2459722.383954364217
(2022-May-22.88395436)
5.7538e-05 TDB
period 1666.262937933755
4.56
8.6373e-06
2.365e-08
d
yr
n .2160523359214945 1.1199e-09 deg/d
Q 3.266636536587657 1.1289e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3246  
   data-arc span      30956 days (84.75 yr)  
   first obs. used      1935-05-03  
   last obs. used      2020-02-02  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .45634  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Feb-22 16:00:53  

Additional Information
 Earth MOID = 1.21823 au 
 Jupiter MOID = 1.90315 au 
 T_jup = 3.320 
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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 11.6   n/a MPO358642  
diameter diameter 19.094 km 0.337 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 4.2397 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Oey, J. (2009) Minor Planet Bull. 36, 4-6.]
geometric albedo albedo 0.122   0.026 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
SMASSII spectral type spec_B X   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)

1638 Ruanda           Discovered 1935 May 3 by C. Jackson at Johannesburg.
Named for the state of Ruanda-Urundi.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: MPC 5182Last Updated: 2006-03-21

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Alternate Designations
 1935 JF = 1930 HF = 1931 RA1 = 1939 DF = 1940 QJ = 1944 KC = 1948 EC = 1949 OC = 1952 BK1 = 1972 JH = A907 EB 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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