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1778 Alfven (4506 P-L)
Classification: Main-belt Asteroid          SPK-ID: 2001778
[ 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 45 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1292141004458163 1.9207e-08  
a 3.148877846324935 1.137e-08 au
q 2.741998427998299 6.0992e-08 au
i 2.474140922492768 8.092e-07 deg
node 106.2376457419449 1.7175e-05 deg
peri 136.4925374353695 1.746e-05 deg
M 34.03632297655863 7.271e-06 deg
tp 2459007.537782024349
(2020-Jun-07.03778202)		 4.1071e-05 TDB
period 2040.948974396476
5.59		 1.1054e-05
3.026e-08		 d
yr
n .1763885351942494 9.5538e-10 deg/d
Q 3.55575726465157 1.2839e-08 au
   Orbit Determination Parameters
   # obs. used (total)      3081  
   data-arc span      24152 days (66.12 yr)  
   first obs. used      1954-08-27  
   last obs. used      2020-10-11  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .4267  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 12:55:48  

Additional Information
 Earth MOID = 1.72828 au 
 Jupiter MOID = 1.45899 au 
 T_jup = 3.194 
[ 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 11.87   n/a E2021B10  
diameter diameter 20.623 km 0.240 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 4.82 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Chang, C.-K.; Ip, W.-H.; Cheng, Y.-C.; Ngeow, C.-C.; et al. (2014) Astrophys. J. 788, A17.]
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.095   0.007 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

1778 Alfven (4506 P-L)          Discovered 1960-Sep-26 by PLS at Palomar
These planets have all been discovered as a result of the Palomar survey of faint minor planets and subsequently identified with planets observed at other oppositions. In Sept. and Oct. 1960, T. Gehrels exposed 130 plates with the 122 cm Schmidt camera at Palomar. In the following years C. J. van Houten and I. van Houten-Groeneveld measured these plates astrometrically and photometrically at Leiden. P. Herget, Cincinnati, computed the orbits of the planets found on the NORC computer, Dahlgren, Virginia, USA.
Note: "planet" implies "minor planet"
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 4506 P-L = 1936 HK = 1952 DD1 = 1958 FB = 1959 NN 
[ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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