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22751 (1998 UA27)
Classification: Main-belt Asteroid          SPK-ID: 2022751
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 .1407667339569364 1.4151e-08  
a 2.227087152634672 6.0462e-09 au
q 1.913587367920837 3.3733e-08 au
i 4.662719469755484 6.2924e-07 deg
node 110.6889952329036 3.5839e-06 deg
peri 134.3846654142614 6.6626e-06 deg
M 25.7843744896966 6.8587e-06 deg
tp 2459113.552250550477
(2020-Sep-21.05225055)
2.3046e-05 TDB
period 1213.959633356098
3.32
4.9436e-06
1.353e-08
d
yr
n .2965502230125629 1.2076e-09 deg/d
Q 2.540586937348508 6.8973e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2630  
   data-arc span      15797 days (43.25 yr)  
   first obs. used      1977-05-19  
   last obs. used      2020-08-18  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .47848  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 04:11:22  

Additional Information
 Earth MOID = .901942 au 
 Jupiter MOID = 2.47954 au 
 T_jup = 3.628 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457101.5 (2015-Mar-20.0) TDB
Reference: JPL 36 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1409003102833508 1.4136e-08  
q 1.913008093890507 3.3681e-08 au
tp 2456685.818742712300
(2014-Jan-28.31874271)
2.2878e-05 TDB
node 110.7198071743617 3.5827e-06 deg
peri 134.3084397941719 6.6671e-06 deg
i 4.662913852340794 6.2928e-07 deg
  Orbit Determination Parameters
   # obs. used (total)      2630  
   data-arc span      15797 days (43.25 yr)  
   first obs. used      1977-05-19  
   last obs. used      2020-08-18  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .47848  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-13 04:11:22  

Additional Information
 Jupiter MOID = 2.47954 au 
 T_jup = 3.628 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.99812981298572E-16 -4.710515187136707E-16 2.480768946118673E-13 1.964105578238812E-15 5.857216875644711E-14 -6.889306945133137E-16
q -4.710515187136707E-16 1.134431702490095E-15 -5.764977757410787E-13 -4.331113430188769E-15 -1.337268623032557E-13 1.439718651004965E-15
tp 2.480768946118673E-13 -5.764977757410787E-13 5.233888754580994E-10 -3.474373319724769E-12 1.341388417148441E-10 3.982289391338374E-12
node 1.964105578238812E-15 -4.331113430188769E-15 -3.474373319724769E-12 1.283585509500921E-11 -1.19569854319008E-11 -1.508474574922225E-12
peri 5.857216875644711E-14 -1.337268623032557E-13 1.341388417148441E-10 -1.19569854319008E-11 4.445036390936229E-11 2.431618948649612E-12
i -6.889306945133137E-16 1.439718651004965E-15 3.982289391338374E-12 -1.508474574922225E-12 2.431618948649612E-12 3.95988741131046E-13

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

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 13.91   n/a E2021B10  
diameter diameter 4.425 km 0.096 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 2.8811 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Behrend, R. (2020) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
geometric albedo albedo 0.328   0.069 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  

22751 (1998 UA27)          Discovered 1998-Oct-18 by Elst, E. W. at La Silla
Reference: 20010309/Numbers.arcLast Updated: 2004-04-19

Alternate Designations
 1998 UA27 = 1977 KD = 1980 DD4 = 1991 RL16 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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