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7871 Tunder (1990 SW4)
Classification: Main-belt Asteroid          SPK-ID: 2007871
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .08382433330867731 3.7006e-08  
a 2.34157586798129 7.7309e-09 au
q 2.145294831956071 8.6527e-08 au
i 4.459070715977104 3.9881e-06 deg
node 150.6874662492172 4.5344e-05 deg
peri 219.9124984525556 4.9768e-05 deg
M 345.0318451816336 2.0667e-05 deg
tp 2458654.915991041765
(2019-Jun-20.41599104)
7.5171e-05 TDB
period 1308.762303219768
3.58
6.4815e-06
1.775e-08
d
yr
n .2750690473849541 1.3622e-09 deg/d
Q 2.537856904006508 8.379e-09 au
  Orbit Determination Parameters
   # obs. used (total)      1738  
   data-arc span      23806 days (65.18 yr)  
   first obs. used      1954-08-27  
   last obs. used      2019-10-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .52266  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Nov-07 03:05:37  

Additional Information
 Earth MOID = 1.14546 au 
 Jupiter MOID = 2.81214 au 
 T_jup = 3.555 
[ 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 14.0   n/a MPO431590  
diameter diameter 4.600 km 0.146 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
geometric albedo albedo 0.230   0.053 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

7871 Tunder (1990 SW4)          Discovered 1990-Sep-22 by Elst, E. W. at La Silla
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 1990 SW4 = 1983 UZ = 1988 AP 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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