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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 ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 36 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .05457592666404132 1.5834e-08  
a 2.529302115324673 7.7635e-09 au
q 2.39126310856751 4.2712e-08 au
i 10.82231574092762 1.3066e-06 deg
node 47.22306849619271 3.0282e-06 deg
peri 133.4187109487838 1.6216e-05 deg
M 301.4573833910086 1.6461e-05 deg
tp 2459439.429138196006
(2021-Aug-12.92913820)
6.7163e-05 TDB
period 1469.262816266938
4.02
6.7647e-06
1.852e-08
d
yr
n .2450208335869262 1.1281e-09 deg/d
Q 2.667341122081837 8.1872e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2670  
   data-arc span      29221 days (80.00 yr)  
   first obs. used      1941-03-19  
   last obs. used      2021-03-20  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .43375  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 19:54:38  

Additional Information
 Earth MOID = 1.40169 au 
 Jupiter MOID = 2.30805 au 
 T_jup = 3.425 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457574.5 (2016-Jul-05.0) TDB
Reference: JPL 36 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .05426110720557019 1.5973e-08  
q 2.391356535118025 4.306e-08 au
tp 2457975.701077686670
(2017-Aug-10.20107769)
6.7353e-05 TDB
node 47.23651545221283 3.0276e-06 deg
peri 134.7298497189047 1.6177e-05 deg
i 10.82438291067371 1.3073e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2670  
   data-arc span      29221 days (80.00 yr)  
   first obs. used      1941-03-19  
   last obs. used      2021-03-20  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .43375  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 19:54:38  

Additional Information
 Jupiter MOID = 2.30805 au 
 T_jup = 3.425 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.55136745353215E-16 -6.785483675781542E-16 1.868693730389468E-13 1.481419628505341E-14 3.526386849331788E-14 -7.076069636306307E-15
q -6.785483675781542E-16 1.854178572660725E-15 -5.247395042609053E-13 -3.717212308629434E-14 -1.070270655265073E-13 1.777541013526442E-14
tp 1.868693730389468E-13 -5.247395042609053E-13 4.536381874506695E-9 -4.589199016514991E-11 1.070933786048668E-9 2.016330045770822E-11
node 1.481419628505341E-14 -3.717212308629434E-14 -4.589199016514991E-11 9.166223072604478E-12 -1.909132975709647E-11 -3.727102873413272E-12
peri 3.526386849331788E-14 -1.070270655265073E-13 1.070933786048668E-9 -1.909132975709647E-11 2.617061116092408E-10 8.104713134953904E-12
i -7.076069636306307E-15 1.777541013526442E-14 2.016330045770822E-11 -3.727102873413272E-12 8.104713134953904E-12 1.708997438286747E-12

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.33   n/a E2021B10  
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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