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3990 Heimdal (1987 SO3)
Classification: Outer Main-belt Asteroid          SPK-ID: 2003990
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.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 41 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2416546327759211 2.0887e-08  
a 3.943890596547247 2.2414e-08 au
q 2.990831162730214 8.3547e-08 au
i 9.493938565286035 2.272e-06 deg
node 192.6388023530467 4.8187e-06 deg
peri 197.8364758576821 5.4479e-06 deg
M 61.68717430254935 4.94e-06 deg
tp 2458710.294599145231
(2019-Aug-14.79459915)
3.8073e-05 TDB
period 2860.788264383566
7.83
2.4388e-05
6.677e-08
d
yr
n .1258394423949343 1.0728e-09 deg/d
Q 4.89695003036428 2.7831e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2933  
   data-arc span      17696 days (48.45 yr)  
   first obs. used      1972-10-08  
   last obs. used      2021-03-21  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .43135  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 21:20:51  

Additional Information
 Earth MOID = 1.99669 au 
 Jupiter MOID = .570334 au 
 T_jup = 2.986 
[ 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 10.88   n/a E2021B10  
diameter diameter 35.675 km 0.367 urn:nasa:pds:neowise_diameters_albedos::2.0[hildas] (http://adsabs.harvard.edu/abs/2012ApJ...744..197G)  
rotation period rot_per 20. h n/a LCDB (Rev. 2020-October); Warner et al., 2009 lower-limit; Incomplete or inconclusive result.
Published Reference List:
[Slyusarev, I.G.; Shevchenko, V.G.; Belskaya, I.N.; Krugly, Yu.N.; Chiorny, V.G. (2012) ACM 2012, #6398.]
geometric albedo albedo 0.067   0.010 urn:nasa:pds:neowise_diameters_albedos::2.0[hildas] (http://adsabs.harvard.edu/abs/2012ApJ...744..197G)  

3990 Heimdal (1987 SO3)          Discovered 1987-Sep-25 by Jensen, P. at Brorfelde
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Alternate Designations
 1987 SO3 = 1971 QJ3 = 1972 TG2 = 1972 XM = 1979 SA3 = 1988 XK2 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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