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923 Herluga (A919 SK)
Classification: Main-belt Asteroid          SPK-ID: 2000923
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.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 43 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1944754594649987 2.2095e-08  
a 2.615866625433487 9.3392e-09 au
q 2.107144761553154 6.125e-08 au
i 14.46237224449483 7.3401e-07 deg
node 197.4656511227541 1.6599e-06 deg
peri 201.2567081615277 5.1535e-06 deg
M 314.9627222602411 7.8791e-06 deg
tp 2459393.826528888582
(2021-Jun-28.32652889)
3.4418e-05 TDB
period 1545.332086944697
4.23
8.2758e-06
2.266e-08
d
yr
n .2329596356934271 1.2476e-09 deg/d
Q 3.12458848931382 1.1155e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2857  
   data-arc span      36977 days (101.24 yr)  
   first obs. used      1919-09-30  
   last obs. used      2020-12-25  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .37828  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 11:38:17  

Additional Information
 Earth MOID = 1.11819 au 
 Jupiter MOID = 2.3301 au 
 T_jup = 3.336 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456952.5 (2014-Oct-22.0) TDB
Reference: JPL 43 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1970078618395454 2.2106e-08  
q 2.098574687214536 6.1272e-08 au
tp 2456306.235449293658
(2013-Jan-13.73544929)
2.787e-05 TDB
node 197.6274459871343 1.6549e-06 deg
peri 201.2814710301798 5.104e-06 deg
i 14.47804003416983 7.3581e-07 deg
  Orbit Determination Parameters
   # obs. used (total)      2857  
   data-arc span      36977 days (101.24 yr)  
   first obs. used      1919-09-30  
   last obs. used      2020-12-25  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .37828  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 11:38:17  

Additional Information
 Jupiter MOID = 2.3301 au 
 T_jup = 3.336 
Orbit Covariance (6×6)
  e q tp node peri i
e 4.886781928180024E-16 -1.3462757541208E-15 -4.436838054938818E-13 7.191945695689204E-15 -7.673260753163763E-14 2.143895508391097E-15
q -1.3462757541208E-15 3.75426063507246E-15 1.188568482870526E-12 -1.91136698075433E-14 2.099338354634151E-13 -5.564494067646777E-15
tp -4.436838054938818E-13 1.188568482870526E-12 7.767103767026033E-10 -5.020799128748187E-12 1.314661385370929E-10 5.782285729468842E-13
node 7.191945695689204E-15 -1.91136698075433E-14 -5.020799128748187E-12 2.738630328916668E-12 -3.603286849514234E-12 1.098599215665919E-12
peri -7.673260753163763E-14 2.099338354634151E-13 1.314661385370929E-10 -3.603286849514234E-12 2.605082419619503E-11 -9.003499085133469E-13
i 2.143895508391097E-15 -5.564494067646777E-15 5.782285729468842E-13 1.098599215665919E-12 -9.003499085133469E-13 5.414188685912167E-13

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 11.60   n/a E2021B10 IRAS observations used: 11
diameter diameter 34.553 km 0.269 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 19.746 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:
[Brinsfield, J.W. (2009) Minor Planet Bull. 36, 64-66.]
geometric albedo albedo 0.037   0.006 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  

923 Herluga (A919 SK)          Discovered 1919-Sep-30 by Reinmuth, K. at Heidelberg
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 A919 SK = A915 VD 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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