+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   183 Istria (A878 CD) Classification: Main-belt Asteroid          SPK-ID: 2000183 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 46 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .3492596642647816 1.5831e-08   a 2.79445211452191 8.5001e-09 au q 1.818462707199979 4.6976e-08 au i 26.39454099315175 3.4342e-07 deg node 141.8834224940821 1.7513e-06 deg peri 264.0039268698574 3.0289e-06 deg M 273.1510274214124 5.7096e-06 deg tp 2459612.128673201855 (2022-Feb-01.62867320) 2.8425e-05 TDB period 1706.253026984025 4.67 7.7851e-06 2.131e-08 d yr n .2109886366832336 9.6267e-10 deg/d Q 3.770441521843842 1.1469e-08 au   Orbit Determination Parameters    # obs. used (total)      3216      data-arc span      41901 days (114.72 yr)      first obs. used      1906-02-22      last obs. used      2020-11-11      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .36512      source      ORB      producer      Otto Matic      solution date      2021-Mar-16 10:44:59   Additional Information  Earth MOID = 1.01407 au   Jupiter MOID = 2.42721 au   T_jup = 3.092  [ 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 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.DB Last Updated: 2003-08-29 [ show close-approach data ] Alternate Designations  A878 CD = 1948 CG  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-12 15:28 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin