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2473 Heyerdahl (1977 RX7)
Classification: Main-belt Asteroid          SPK-ID: 2002473
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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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 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 39 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .134370638290975 1.7255e-08  
a 2.241678028052966 6.5815e-09 au
q 1.940462320580634 3.8455e-08 au
i 5.191793836003369 4.2146e-07 deg
node 185.5996570013195 4.4851e-06 deg
peri 231.069907341286 8.9936e-06 deg
M 330.9216032411301 6.2895e-06 deg
tp 2459495.520755757127
(2021-Oct-08.02075576)
2.1672e-05 TDB
period 1225.909130003596
3.36
5.3989e-06
1.478e-08
d
yr
n .2936596124371338 1.2933e-09 deg/d
Q 2.542893735525297 7.4659e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2620  
   data-arc span      30555 days (83.66 yr)  
   first obs. used      1937-11-29  
   last obs. used      2021-07-26  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .4533  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 08:42:47  

Additional Information
 Earth MOID = .956229 au 
 Jupiter MOID = 2.78194 au 
 T_jup = 3.617 
[ 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 13.25   n/a MPO636099  
diameter diameter 4.935 km 0.219 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 47.779 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Erasmus, N.; Navarro-Meza, S.; McNeill, A.; Trilling, D.E.; et al. (2020) Ap. J. Suppl. Ser. 247, A13.]
geometric albedo albedo 0.381   0.057 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

2473 Heyerdahl (1977 RX7)          Discovered 1977-Sep-12 by Chernykh, N. at Nauchnyj
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 1977 RX7 = 1937 WG = 1957 WF = 1967 RW = 1967 UD = 1976 JL2 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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