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4222 Nancita (1988 EK1)
Classification: Mars-crossing Asteroid          SPK-ID: 2004222
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 43 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .2962398700524267 2.8139e-08  
a 2.366610254387913 6.2634e-09 au
q 1.665525940163297 6.7478e-08 au
i 3.740889110807368 3.9337e-06 deg
node 206.8087981774831 5.0819e-05 deg
peri 217.9506492617807 5.1287e-05 deg
M 69.0119755837741 8.2128e-06 deg
tp 2458945.576132261060
(2020-Apr-06.07613226)
2.9737e-05 TDB
period 1329.806770632368
3.64
5.2791e-06
1.445e-08
d
yr
n .2707160227713444 1.0747e-09 deg/d
Q 3.067694568612529 8.1189e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2745  
   data-arc span      19200 days (52.57 yr)  
   first obs. used      1968-08-28  
   last obs. used      2021-03-23  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .44071  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 21:29:12  

Additional Information
 Earth MOID = .680207 au 
 Jupiter MOID = 2.27287 au 
 T_jup = 3.484 
[ 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 12.44   n/a E2020-QM5  
diameter diameter 9.636 km 0.121 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 3.8732 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Higgins, D.; Pravec, P.; Kusnirak, P.; Reddy, V.; Dyvig, R. (2006) Minor Planet Bull. 33, 64-66.]
[Durech, J.; Hanus, J.; Ali-Lagoa, V. (2018) Astron. Astrophys. 617, A57.]
geometric albedo albedo 0.209   0.013 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
SMASSII spectral type spec_B S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002)

4222 Nancita (1988 EK1)          Discovered 1988-Mar-13 by Helin, E. at Palomar
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 1988 EK1 = 1950 TF4 = 1952 HN = 1968 QL1 = 1972 XQ1 = 1979 SL6 = 1983 XC1 = 1988 KL 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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