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1845 Helewalda (1972 UC)
Classification: Main-belt Asteroid          SPK-ID: 2001845
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 41 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .05628952559250781 3.3113e-08  
a 2.968617548521415 1.1806e-08 au
q 2.801515475049551 9.8344e-08 au
i 10.72021664696216 3.9227e-06 deg
node 142.5892218515752 1.6809e-05 deg
peri 324.1489349426465 3.6569e-05 deg
M 82.25440012690804 3.1231e-05 deg
tp 2458773.639035709684
(2019-Oct-17.13903571)
0.00016239 TDB
period 1868.227680311577
5.11
1.1145e-05
3.051e-08
d
yr
n .1926959994190646 1.1495e-09 deg/d
Q 3.135719621993279 1.2471e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3153  
   data-arc span      32647 days (89.38 yr)  
   first obs. used      1931-11-04  
   last obs. used      2021-03-23  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .39754  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 19:48:12  

Additional Information
 Earth MOID = 1.82495 au 
 Jupiter MOID = 1.92897 au 
 T_jup = 3.235 
[ 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 11.31   n/a E2021B10  
diameter diameter 19.930 km 0.377 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 7.2786 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Carbo, L.; Green, D.; Kragh, K.; Krotz, J.; et al. (2009) Minor Planet Bull. 36, 152-157.]
[Behrend, R. (2010) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Brinsfield, J.W. (2010) Minor Planet Bull. 37, 146-147.]
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
[DeGraff, D.R. (2017) Minor Planet Bull. 44, 350-354.]
geometric albedo albedo 0.134   0.014 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  

1845 Helewalda (1972 UC)          Discovered 1972-Oct-30 by Wild, P. at Zimmerwald
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 1972 UC = 1931 VC1 = 1954 GG = 1971 OR = 1971 QX2 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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