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43725 (1978 RK9)
Classification: Main-belt Asteroid          SPK-ID: 2043725
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 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1601497574232928 3.2092e-08  
a 2.269384776823614 6.1333e-09 au
q 1.905943355315199 7.2629e-08 au
i 4.8053485528992 4.6693e-06 deg
node 347.2289842583205 3.6308e-05 deg
peri 122.2842231472074 3.9197e-05 deg
M 17.86560476934977 1.3736e-05 deg
tp 2459138.530805065096
(2020-Oct-16.03080507)
4.7604e-05 TDB
period 1248.707248625498
3.42
5.0622e-06
1.386e-08
d
yr
n .2882981582722984 1.1687e-09 deg/d
Q 2.632826198332029 7.1155e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1902  
   data-arc span      15544 days (42.56 yr)  
   first obs. used      1978-09-02  
   last obs. used      2021-03-24  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .46483  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-04 05:26:40  

Additional Information
 Earth MOID = .92748 au 
 Jupiter MOID = 2.47788 au 
 T_jup = 3.592 
[ 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 14.61   n/a MPCxxxxx  
diameter diameter 4.137 km 1.074 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2015ApJ...814..117N)  
geometric albedo albedo 0.164   0.106 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2015ApJ...814..117N)  

43725 (1978 RK9)          Discovered 1978-Sep-02 by Lagerkvist, C.-I. at La Silla
Reference: 20020822/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1978 RK9 = 1987 HN2 = 1999 XW122 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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