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6000 United Nations (1987 UN)
Classification: Main-belt Asteroid          SPK-ID: 2006000
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 45 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1850269277037795 2.4469e-08  
a 2.601884308011158 1.1552e-08 au
q 2.120465648259179 6.7235e-08 au
i 14.39945797647356 1.0427e-06 deg
node 52.11590519340635 2.8816e-06 deg
peri 315.645009903178 4.0493e-06 deg
M 340.302765594932 5.7557e-06 deg
tp 2459284.375119541733
(2021-Mar-10.87511954)
2.4803e-05 TDB
period 1532.958506461939
4.20
1.0209e-05
2.795e-08
d
yr
n .2348400158794111 1.564e-09 deg/d
Q 3.083302967763137 1.3689e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2467  
   data-arc span      12124 days (33.19 yr)  
   first obs. used      1987-10-27  
   last obs. used      2021-01-05  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .38381  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 18:13:05  

Additional Information
 Earth MOID = 1.14461 au 
 Jupiter MOID = 2.43356 au 
 T_jup = 3.346 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 11.97   n/a E2021B10  
diameter diameter 11.000 km 0.295 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 3.262 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Bennefeld, C. (2011) http://www.bennefeld.org/astronomy/]
[Hanus, J.; Durech, J.; Oszkiewicz, D.A.; Behrend, R.; et al. (2016) Astron. Astrophys. 586, A108.]
[Behrend, R. (2020) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
geometric albedo albedo 0.211   0.034 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

6000 United Nations (1987 UN)          Discovered 1987-Oct-27 by Jensen, P. at Brorfelde
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ hide close-approach data ]
Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
2104-Jan-18 18:26 00:02 Amphi 0.0463758816691789 0.0463630618025847 0.0463887024457938 4.84011329470767 4.84011326909675 2489547.268138928 1.78395448476733 716.82666362392 43.9777872244289 -26.9842736605266 72071.2594285303 T 45 CATAB v2.0f-lin.ifort 2021-Apr-12 18:13:47 2021-Apr-12 18:13

Alternate Designations
 1987 UN = 1991 TC1 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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