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JPL Small-Body Database Browser
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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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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.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 35 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .05634968256631939 3.4227e-08  
a 2.969293533998363 1.2007e-08 au
q 2.801974785911331 1.0219e-07 au
i 10.71969038324147 4.0467e-06 deg
node 142.5878026574629 1.7082e-05 deg
peri 324.3754592961199 3.7262e-05 deg
M 43.50061713638558 3.1772e-05 deg
tp 2458774.675507346792
(2019-Oct-18.17550735)
0.00016514 TDB
period 1868.865839311395
5.12
1.1336e-05
3.104e-08
d
yr
n .1926301997861152 1.1684e-09 deg/d
Q 3.136612282085396 1.2684e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2882  
   data-arc span      32318 days (88.48 yr)  
   first obs. used      1931-11-04  
   last obs. used      2020-04-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .41047  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 01:31:28  

Additional Information
 Earth MOID = 1.82541 au 
 Jupiter MOID = 1.92832 au 
 T_jup = 3.234 
[ 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 11.2   n/a MPO337261  
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. 2019-August); 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

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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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