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1995 Hajek (1971 UP1)
Classification: Main-belt Asteroid          SPK-ID: 2001995
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 2459000.5 (2020-May-31.0) TDB
Reference: JPL 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .05466432735484174 6.547e-08  
a 2.528951116231662 9.1154e-09 au
q 2.390707704549582 1.6561e-07 au
i 10.82335271768387 4.1669e-06 deg
node 47.22808299047186 2.1156e-05 deg
peri 133.5636476022157 4.1732e-05 deg
M 252.3091218568682 3.8629e-05 deg
tp 2459439.925743718713
(2021-Aug-13.42574372)
0.00015801 TDB
period 1468.956985646289
4.02
7.9421e-06
2.174e-08
d
yr
n .2450718458863605 1.325e-09 deg/d
Q 2.667194527913742 9.6137e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2306  
   data-arc span      29096 days (79.66 yr)  
   first obs. used      1941-03-19  
   last obs. used      2020-11-15  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .45707  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-18 02:03:50  

Additional Information
 Earth MOID = 1.40178 au 
 Jupiter MOID = 2.30921 au 
 T_jup = 3.425 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457067.5 (2015-Feb-14.0) TDB
Reference: JPL 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .05401089385390928 6.5548e-08  
q 2.39267329618164 1.6569e-07 au
tp 2456505.614670405066
(2013-Aug-01.11467041)
0.00015977 TDB
node 47.24348852491814 2.116e-05 deg
peri 134.4668839170527 4.2416e-05 deg
i 10.82261700673666 4.1674e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2306  
   data-arc span      29096 days (79.66 yr)  
   first obs. used      1941-03-19  
   last obs. used      2020-11-15  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .45707  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Dec-18 02:03:50  

Additional Information
 Jupiter MOID = 2.30921 au 
 T_jup = 3.425 
Orbit Covariance (6×6)
  e q tp node peri i
e 4.296586950023271E-15 -1.084615836631628E-14 -4.821455629147258E-12 3.476158316032595E-14 -9.854747894046358E-13 -8.161499099855414E-15
q -1.084615836631628E-14 2.745455985831159E-14 1.226364448296334E-11 -8.937938939849206E-14 2.514368110866664E-12 2.082228538788958E-14
tp -4.821455629147258E-12 1.226364448296334E-11 2.552641384222204E-8 -3.965920775407961E-11 5.881237423033673E-9 2.128872897654831E-11
node 3.476158316032595E-14 -8.937938939849206E-14 -3.965920775407961E-11 4.477331958029462E-10 -4.474711424759863E-10 -2.780007349155501E-11
peri -9.854747894046358E-13 2.514368110866664E-12 5.881237423033673E-9 -4.474711424759863E-10 1.79912261093535E-9 3.199113139108628E-11
i -8.161499099855414E-15 2.082228538788958E-14 2.128872897654831E-11 -2.780007349155501E-11 3.199113139108628E-11 1.736750945846939E-11

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.2   n/a MPO412178  
diameter diameter 12.683 km 0.288 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 10. h n/a LCDB (Rev. 2020-October); Warner et al., 2009 lower-limit; Result based on fragmentary lightcurve(s), may be completely wrong.
Published Reference List:
[Behrend, R. (2003) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
geometric albedo albedo 0.040   0.025 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

1995 Hajek (1971 UP1)          Discovered 1971-Oct-26 by Kohoutek, L. at Bergedorf
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 1971 UP1 = 1941 EA 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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