Skip Page Navigation
NASA JPL Caltech
NASA Logo - Jet Propulsion Laboratory + View the NASA Portal
+ Center for Near-Earth Object Studies
JPL Home Earth Solar System Stars & Galaxies Technology
JPL Solar System Dynamics
BODIES ORBITS EPHEMERIDES TOOLS PHYSICAL DATA DISCOVERY FAQ SITE MAP
JPL Small-Body Database Browser
Search: [ help ]  
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 ]

[ hide orbit diagram ]

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.


[ revert to old Java-based viewer ]

Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .0563496836495804 3.414e-08  
a 2.969293533606459 1.1989e-08 au
q 2.80197478232499 1.0186e-07 au
i 10.71969032652648 4.0431e-06 deg
node 142.5878031628687 1.6918e-05 deg
peri 324.3754584186272 3.7155e-05 deg
M 43.50061767529353 3.172e-05 deg
tp 2458774.675504593871
(2019-Oct-18.17550459)
0.00016488 TDB
period 1868.865838941399
5.12
1.1318e-05
3.099e-08
d
yr
n .1926301998242519 1.1666e-09 deg/d
Q 3.136612284887927 1.2664e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2986  
   data-arc span      32373 days (88.63 yr)  
   first obs. used      1931-11-04  
   last obs. used      2020-06-22  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .40557  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-24 22:41:53  

Additional Information
 Earth MOID = 1.82541 au 
 Jupiter MOID = 1.92832 au 
 T_jup = 3.234 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457093.5 (2015-Mar-12.0) TDB
Reference: JPL 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .05702399674293551 3.4455e-08  
q 2.802291649201619 1.034e-07 au
tp 2456916.815911641105
(2014-Sep-16.31591164)
0.0001631 TDB
node 142.6140074425774 1.6907e-05 deg
peri 326.5509316902383 3.6424e-05 deg
i 10.72041201506844 4.0441e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2986  
   data-arc span      32373 days (88.63 yr)  
   first obs. used      1931-11-04  
   last obs. used      2020-06-22  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .40557  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-24 22:41:53  

Additional Information
 Jupiter MOID = 1.92832 au 
 T_jup = 3.234 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.187114340778157E-15 -3.541012214015225E-15 1.13484793362946E-12 -1.498386059022021E-15 2.191354048405742E-13 -7.822418410716515E-16
q -3.541012214015225E-15 1.069218246994889E-14 -3.855032104571483E-12 3.781864570291393E-15 -7.446045622604071E-13 2.460877456741462E-15
tp 1.13484793362946E-12 -3.855032104571483E-12 2.66022449133044E-8 -1.042351556541881E-11 5.271943567540817E-9 6.092570086537606E-13
node -1.498386059022021E-15 3.781864570291393E-15 -1.042351556541881E-11 2.858343618726489E-10 -2.826609882936191E-10 -4.120311597596595E-12
peri 2.191354048405742E-13 -7.446045622604071E-13 5.271943567540817E-9 -2.826609882936191E-10 1.326695036436788E-9 4.187170927832298E-12
i -7.822418410716515E-16 2.460877456741462E-15 6.092570086537606E-13 -4.120311597596595E-12 4.187170927832298E-12 1.635444703425205E-11

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

[ 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 ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2020-Nov-29 15:27 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin