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5621 Erb (1990 SG4)
Classification: Mars-crossing Asteroid          SPK-ID: 2005621
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 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .386110791799271 3.6835e-08  
a 2.302654804042703 7.2669e-09 au
q 1.413574934413379 8.4277e-08 au
i 5.545782658506289 3.4903e-06 deg
node 278.9351731159956 4.4088e-05 deg
peri 5.232945052035737 4.4592e-05 deg
M 213.1640743120867 9.0591e-06 deg
tp 2459521.060854712558
(2021-Nov-02.56085471)
3.313e-05 TDB
period 1276.267417653816
3.49
6.0416e-06
1.654e-08
d
yr
n .2820725460983671 1.3353e-09 deg/d
Q 3.191734673672026 1.0073e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1860  
   data-arc span      23776 days (65.10 yr)  
   first obs. used      1955-09-17  
   last obs. used      2020-10-21  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .47598  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 03:42:04  

Additional Information
 Earth MOID = .397245 au 
 Jupiter MOID = 1.99124 au 
 T_jup = 3.481 
[ show covariance matrix ]

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 14.0   n/a MPO452246  
diameter diameter 3.302 km 0.604 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2015ApJ...814..117N)  
rotation period rot_per 8.027 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Skiff, B.A. (2011) Posting on CALL web site. http://www.minorplanet.info/call.html]
geometric albedo albedo 0.425   0.215 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2015ApJ...814..117N)  

5621 Erb (1990 SG4)          Discovered 1990-Sep-23 by Lawrence, K. at Palomar
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Alternate Designations
 1990 SG4 = 1955 ST2 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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