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4894 Ask (1986 RJ)
Classification: Main-belt Asteroid          SPK-ID: 2004894
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 45 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1951053663008132 1.9553e-08  
a 2.173615251399402 5.0108e-09 au
q 1.749531251578088 4.2257e-08 au
i 2.638974146098305 5.7858e-07 deg
node 263.6055634206278 1.66e-05 deg
peri 47.27716707842923 1.6926e-05 deg
M 273.6359824151094 4.6602e-06 deg
tp 2459481.303665307835
(2021-Sep-23.80366531)
1.5596e-05 TDB
period 1170.502743361329
3.20
4.0475e-06
1.108e-08
d
yr
n .3075601505778527 1.0635e-09 deg/d
Q 2.597699251220717 5.9885e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2964  
   data-arc span      25314 days (69.31 yr)  
   first obs. used      1951-12-01  
   last obs. used      2021-03-22  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .44763  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 21:55:47  

Additional Information
 Earth MOID = .734455 au 
 Jupiter MOID = 2.66388 au 
 T_jup = 3.660 
[ 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 13.46   n/a E2021B10  
diameter diameter 5.018 km 0.088 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 3.636 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:
[Behrend, R. (2002) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Skiff, B.A. (2011) Posting on CALL web site. http://www.minorplanet.info/call.html]
[Behrend, R. (2015) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Skiff, B.A.; McLelland, K.P.; Sanborn, J.; Pravec, P.; Koehn, B.W. (2019). Minor Planet Bull. 46, 458-503.]
geometric albedo albedo 0.279   0.048 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

4894 Ask (1986 RJ)          Discovered 1986-Sep-08 by Jensen, P. at Brorfelde
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 1986 RJ = 1957 OG = 1969 EK = 1976 KY 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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