+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   19508 (1998 MC17) Classification: Outer Main-belt Asteroid          SPK-ID: 2019508 [ 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 22 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .2114304607451045 3.4421e-08   a 3.218545655830819 1.9699e-08 au q 2.538047064889354 1.0544e-07 au i 1.219717629158233 4.1768e-06 deg node 47.46538777912218 0.0001834 deg peri 61.62236624363385 0.0001837 deg M 178.1541993708223 1.2911e-05 deg tp 2458156.786019110153 (2018-Feb-07.28601911) 6.9336e-05 TDB period 2109.055158100766 5.77 1.9362e-05 5.301e-08 d yr n .1706925485648204 1.5671e-09 deg/d Q 3.899044246772284 2.3864e-08 au   Orbit Determination Parameters    # obs. used (total)      1202      data-arc span      8974 days (24.57 yr)      first obs. used      1994-12-04      last obs. used      2019-06-30      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .56194      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 02:56:02   Additional Information  Earth MOID = 1.55494 au   Jupiter MOID = 1.24092 au   T_jup = 3.154  [ 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 14.0   n/a MPO347675   diameter diameter 9.143 km 0.489 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.058   0.014 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   19508 (1998 MC17)          Discovered 1998-Jun-27 by Spacewatch at Kitt Peak Reference: 20001211/Numbers.arc Last Updated: 2004-04-19 [ show close-approach data ] Alternate Designations  1998 MC17 = 1994 XA6 = 1999 SM14  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-18 00:50 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin