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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 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 35 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .05457592665333662 1.5878e-08  
a 2.529302115128137 7.8151e-09 au
q 2.391263108408775 4.2767e-08 au
i 10.8223156719113 1.3119e-06 deg
node 47.22306864900172 3.0391e-06 deg
peri 133.4187099892977 1.6452e-05 deg
M 301.4573843358817 1.6772e-05 deg
tp 2459439.429134311861
(2021-Aug-12.92913431)
6.8457e-05 TDB
period 1469.262816095687
4.02
6.8097e-06
1.864e-08
d
yr
n .2450208336154848 1.1356e-09 deg/d
Q 2.6673411218475 8.2416e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2648  
   data-arc span      29217 days (79.99 yr)  
   first obs. used      1941-03-19  
   last obs. used      2021-03-16  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .43527  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 13:13:04  

Additional Information
 Earth MOID = 1.40169 au 
 Jupiter MOID = 2.30805 au 
 T_jup = 3.425 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457529.5 (2016-May-21.0) TDB
Reference: JPL 35 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .05424302109200266 1.6018e-08  
q 2.391474848929044 4.3118e-08 au
tp 2457975.607153666577
(2017-Aug-10.10715367)
6.8508e-05 TDB
node 47.23624789523046 3.0385e-06 deg
peri 134.7013120494171 1.6416e-05 deg
i 10.82427430404252 1.3126e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2648  
   data-arc span      29217 days (79.99 yr)  
   first obs. used      1941-03-19  
   last obs. used      2021-03-16  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .43527  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 13:13:04  

Additional Information
 Jupiter MOID = 2.30805 au 
 T_jup = 3.425 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.565788101135648E-16 -6.812099647408173E-16 2.004702844838817E-13 1.489295517291635E-14 3.814663551461953E-14 -7.118152289822729E-15
q -6.812099647408173E-16 1.859142914477947E-15 -5.487584735487447E-13 -3.739344415660146E-14 -1.120432296666314E-13 1.788755061749011E-14
tp 2.004702844838817E-13 -5.487584735487447E-13 4.693389188096504E-9 -4.659221503148074E-11 1.105765247995949E-9 2.041967245161857E-11
node 1.489295517291635E-14 -3.739344415660146E-14 -4.659221503148074E-11 9.232745744379329E-12 -1.930934151824438E-11 -3.757485240957712E-12
peri 3.814663551461953E-14 -1.120432296666314E-13 1.105765247995949E-9 -1.930934151824438E-11 2.694960524937139E-10 8.190492237769052E-12
i -7.118152289822729E-15 1.788755061749011E-14 2.041967245161857E-11 -3.757485240957712E-12 8.190492237769052E-12 1.72290075748303E-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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