+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   18366 (1991 DG1) Classification: Main-belt Asteroid          SPK-ID: 2018366 [ 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 28 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1491134782827554 3.0136e-08   a 3.11185554486051 1.6889e-08 au q 2.64783594065288 9.2131e-08 au i 4.966192391196746 3.7087e-06 deg node 173.6562560242297 4.0458e-05 deg peri 271.466974795867 4.2578e-05 deg M 224.6405708391688 1.5164e-05 deg tp 2459954.399721635748 (2023-Jan-09.89972164) 8.8069e-05 TDB period 2005.060906886603 5.49 1.6323e-05 4.469e-08 d yr n .179545668046063 1.4616e-09 deg/d Q 3.57587514906814 1.9407e-08 au   Orbit Determination Parameters    # obs. used (total)      1753      data-arc span      21022 days (57.56 yr)      first obs. used      1962-12-30      last obs. used      2020-07-20      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .507      source      ORB      producer      Otto Matic      solution date      2020-Nov-13 02:15:25   Additional Information  Earth MOID = 1.66956 au   Jupiter MOID = 1.67963 au   T_jup = 3.196  [ 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 13.41   n/a E2021B10   diameter diameter 7.337 km 0.247 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.227   0.073 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   18366 (1991 DG1)          Discovered 1991-Feb-18 by Helin, E. F. at Palomar Reference: 20001111/Numbers.arc Last Updated: 2004-04-19 [ show close-approach data ] Alternate Designations  1991 DG1 = 1962 YA = 1999 RK118  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Apr-10 15:48 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin