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183 Istria (A878 CD)
Classification: Main-belt Asteroid          SPK-ID: 2000183
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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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 2459396.5 (2021-Jul-01.0) TDB
Reference: JPL 51 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3487371497510577 1.5712e-08  
a 2.795318871123943 8.3877e-09 au
q 1.820487335362835 4.6533e-08 au
i 26.39966135507413 3.4334e-07 deg
node 141.8773799264254 1.7452e-06 deg
peri 263.9218753649949 2.9235e-06 deg
M 314.5217287475662 5.4502e-06 deg
tp 2459612.148731776970
(2022-Feb-01.64873178)
2.6539e-05 TDB
period 1707.046932562432
4.67
7.6833e-06
2.104e-08
d
yr
n .2108905110532652 9.4921e-10 deg/d
Q 3.770150406885051 1.1313e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3422  
   data-arc span      42169 days (115.45 yr)  
   first obs. used      1906-02-22  
   last obs. used      2021-08-06  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .35519  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 06:18:32  

Additional Information
 Earth MOID = 1.01614 au 
 Jupiter MOID = 2.42817 au 
 T_jup = 3.092 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457082.5 (2015-Mar-01.0) TDB
Reference: JPL 51 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3512672156731224 1.5665e-08  
q 1.810019338773383 4.6264e-08 au
tp 2457909.143122398982
(2017-Jun-04.64312240)
2.1799e-05 TDB
node 141.9540247210898 1.7495e-06 deg
peri 264.2039890777802 2.931e-06 deg
i 26.39257448696308 3.4296e-07 deg
  Orbit Determination Parameters
   # obs. used (total)      3422  
   data-arc span      42169 days (115.45 yr)  
   first obs. used      1906-02-22  
   last obs. used      2021-08-06  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .35519  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Aug-25 06:18:32  

Additional Information
 Jupiter MOID = 2.42817 au 
 T_jup = 3.092 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.453768983736141E-16 -7.207855061510987E-16 -1.885828649811046E-13 5.002899844960339E-15 -2.008889719191534E-14 -8.027672636208734E-16
q -7.207855061510987E-16 2.140346418861338E-15 5.863622031284476E-13 -1.377181258338709E-14 6.066732124639011E-14 2.390309665726782E-15
tp -1.885828649811046E-13 5.863622031284476E-13 4.752178385380887E-10 1.897992122339368E-12 5.225404153846976E-11 9.652437043159119E-13
node 5.002899844960339E-15 -1.377181258338709E-14 1.897992122339368E-12 3.060817615636587E-12 -2.281810571681714E-12 4.375625430879173E-13
peri -2.008889719191534E-14 6.066732124639011E-14 5.225404153846976E-11 -2.281810571681714E-12 8.590546680506007E-12 -3.425690790028936E-13
i -8.027672636208734E-16 2.390309665726782E-15 9.652437043159119E-13 4.375625430879173E-13 -3.425690790028936E-13 1.176210659055711E-13

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 9.57   n/a E2021B10 IRAS observations used: 7
diameter diameter 32.927 km 0.168 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 11.77 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Harris, A.W.; Young, J.W. (1983) Icarus 54, 59-109.]
[Behrend, R. (2004) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
[Hanus, J.; Durech, J.; Broz, M.; Marciniak, A.; et al. (2013) Astron. Astrophys. 551, A67.]
geometric albedo albedo 0.227   0.038 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
B-V BV 0.842   0.046 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=3.18, mean=3.66, max.=4.14) deg.
U-B UB 0.359   0.032 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=2; phase (min.=3.18, mean=3.66, max.=4.14) deg.
Tholen spectral type spec_T S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 2 color indices
SMASSII spectral type spec_B S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002)

183 Istria (A878 CD)          Discovered 1878-Feb-08 by Palisa, J. at Pola
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 A878 CD = 1948 CG 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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