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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 
[ 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 11.60   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

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