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830 Petropolitana (A917 YD)
Classification: Outer Main-belt Asteroid          SPK-ID: 2000830
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 52 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06511318846030706 1.4848e-08  
a 3.208944406127975 1.2807e-08 au
q 2.999999804253116 4.9948e-08 au
i 3.802735375867458 1.1031e-06 deg
node 340.2783879550154 7.8238e-06 deg
peri 90.93398809694386 2.397e-05 deg
M 331.6769317117431 2.2138e-05 deg
tp 2459365.688388070334
(2021-May-31.18838807)
0.00012887 TDB
period 2099.624909988175
5.75
1.257e-05
3.441e-08
d
yr
n .1714591964914474 1.0265e-09 deg/d
Q 3.417889008002834 1.3641e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3522  
   data-arc span      38174 days (104.51 yr)  
   first obs. used      1916-09-03  
   last obs. used      2021-03-10  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .41162  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 11:30:30  

Additional Information
 Earth MOID = 2.01716 au 
 Jupiter MOID = 1.77274 au 
 T_jup = 3.185 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456406.5 (2013-Apr-24.0) TDB
Reference: JPL 52 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .06181425622479025 1.42e-08  
q 3.01442660081673 4.6788e-08 au
tp 2457232.748073133269
(2015-Jul-29.24807313)
0.00014596 TDB
node 340.7648577203296 7.6966e-06 deg
peri 85.39649578027708 2.6326e-05 deg
i 3.815993471791721 1.1066e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      3522  
   data-arc span      38174 days (104.51 yr)  
   first obs. used      1916-09-03  
   last obs. used      2021-03-10  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .41162  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 11:30:30  

Additional Information
 Jupiter MOID = 1.77274 au 
 T_jup = 3.185 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.016427388877297E-16 -6.423620573606426E-16 6.37368434821835E-14 -6.449498082823943E-14 7.964803662573788E-14 -7.647819584876308E-15
q -6.423620573606426E-16 2.189137564009817E-15 -7.049153094467733E-13 2.089611956669854E-13 -3.532005518808894E-13 2.503429601705762E-14
tp 6.37368434821835E-14 -7.049153094467733E-13 2.130547867713132E-8 3.128851726856923E-10 3.681128744172677E-9 3.691452346361597E-11
node -6.449498082823943E-14 2.089611956669854E-13 3.128851726856923E-10 5.923777652841765E-11 -1.30671484213068E-12 7.92148538865357E-12
peri 7.964803662573788E-14 -3.532005518808894E-13 3.681128744172677E-9 -1.30671484213068E-12 6.930569077840501E-10 -1.245711958661631E-12
i -7.647819584876308E-15 2.503429601705762E-14 3.691452346361597E-11 7.92148538865357E-12 -1.245711958661631E-12 1.224626065257686E-12

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 9.15   n/a E2021B10 IRAS observations used: 12
diameter diameter 41.328 km 0.131 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 39.0 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:
[Behrend, R. (2005) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Hanus, J.; Durech, J.; Oszkiewicz, D.A.; Behrend, R.; et al. (2016) Astron. Astrophys. 586, A108.]
geometric albedo albedo 0.215   0.019 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
B-V BV 0.899   0.010 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=5.04, mean=7.32, max.=9.59) deg.
U-B UB 0.500   0.020 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=9.59 deg.
Tholen spectral type spec_T S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 2 color indices; used ground-based radiometric albedo

830 Petropolitana (A917 YD)          Discovered 1916-Aug-25 by Neujmin, G. at Simeis
Independent discovery Sept. 3 by M. Wolf, Heidelberg, was announced first.
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 A917 YD = 1933 RK = 1949 KW = A916 QE 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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