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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 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .05457592320972023 6.4038e-08  
a 2.529302118183552 7.9932e-09 au
q 2.391263120007384 1.6284e-07 au
i 10.82231938877942 3.1772e-06 deg
node 47.22299814505584 1.9661e-05 deg
peri 133.4187468934302 3.9213e-05 deg
M 301.4574138757843 3.5808e-05 deg
tp 2459439.429014184024
(2021-Aug-12.92901418)
0.00014611 TDB
period 1469.262818758007
4.02
6.9648e-06
1.907e-08
d
yr
n .2450208331715044 1.1615e-09 deg/d
Q 2.66734111635972 8.4294e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2520  
   data-arc span      29166 days (79.85 yr)  
   first obs. used      1941-03-19  
   last obs. used      2021-01-24  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .44032  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 00:59:40  

Additional Information
 Earth MOID = 1.40169 au 
 Jupiter MOID = 2.30805 au 
 T_jup = 3.425 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457482.5 (2016-Apr-04.0) TDB
Reference: JPL 33 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .05422451459982557 6.3985e-08  
q 2.391599136096441 1.6257e-07 au
tp 2457975.510624125627
(2017-Aug-10.01062413)
0.00015044 TDB
node 47.23599701341904 1.9659e-05 deg
peri 134.6719632751989 4.0002e-05 deg
i 10.82414232438757 3.1778e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2520  
   data-arc span      29166 days (79.85 yr)  
   first obs. used      1941-03-19  
   last obs. used      2021-01-24  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .44032  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Feb-24 00:59:40  

Additional Information
 Jupiter MOID = 2.30805 au 
 T_jup = 3.425 
Orbit Covariance (6×6)
  e q tp node peri i
e 4.094031642823533E-15 -1.039109102648412E-14 -5.569525249585739E-12 4.160554461313137E-14 -1.159581338594718E-12 -1.116017639670877E-14
q -1.039109102648412E-14 2.643062289002042E-14 1.399189353365205E-11 -1.064328099519278E-13 2.903953928985456E-12 2.823183997121119E-14
tp -5.569525249585739E-12 1.399189353365205E-11 2.263343725793143E-8 -5.308428272801902E-11 5.244219231065196E-9 2.519223944559621E-11
node 4.160554461313137E-14 -1.064328099519278E-13 -5.308428272801902E-11 3.864847262313776E-10 -3.900413072722766E-10 -6.887267164528946E-12
peri -1.159581338594718E-12 2.903953928985456E-12 5.244219231065196E-9 -3.900413072722766E-10 1.60018187650201E-9 1.229783949569246E-11
i -1.116017639670877E-14 2.823183997121119E-14 2.519223944559621E-11 -6.887267164528946E-12 1.229783949569246E-11 1.009811295253596E-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 13.33   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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