+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   1717 Arlon (1954 AC) Classification: Main-belt Asteroid          SPK-ID: 2001717 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB Reference: JPL 66 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1288576585362846 3.0094e-08   a 2.196345258855634 4.9864e-09 au q 1.913329351462227 6.5817e-08 au i 6.187452228353417 4.6795e-06 deg node 340.4571151558649 2.6474e-05 deg peri 115.9518011577886 3.1769e-05 deg M 167.0358192175333 1.7108e-05 deg tp 2458448.859105669334 (2018-Nov-26.35910567) 5.6232e-05 TDB period 1188.910994595787 3.26 4.0488e-06 1.109e-08 d yr n .3027981082153209 1.0312e-09 deg/d Q 2.479361166249041 5.629e-09 au   Orbit Determination Parameters    # obs. used (total)      2860      data-arc span      32637 days (89.36 yr)      first obs. used      1930-12-20      last obs. used      2020-04-28      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .40449      source      ORB      producer      Otto Matic      solution date      2020-May-20 01:28:59   Additional Information  Earth MOID = .939473 au   Jupiter MOID = 2.66056 au   T_jup = 3.650  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 12.2   n/a MPO431513   diameter diameter 8.484 km 0.183 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   rotation period rot_per 5.1484 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List: [Pravec, P.; Wolf, M.; Sarounova, L. (2005) http://www.asu.cas.cz/~ppravec/neo.htm] [Behrend, R. (2006) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Cooney, W.; Gross, J.; Terrell, D.; Stephens, R.; Pravec, P.; et al. (2005) CBET 369.] [Cooney, W.; Gross, J.; Terrell, D.; Pravec, P.; Kusnirak, P.; et al. (2006) CBET 504.] [Behrend, R. (2008) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html] [Brinsfield, J.W. (2009) Minor Planet Bull. 36, 64-66.] [Pravec, P.; Wolf, M.; Sarounova, L. (2011) http://www.asu.cas.cz/~ppravec/neo.htm] [Oey, J. (2014) Minor Planet Bull. 41, 276-281.] [Franco, L.; Marchini, A.; Battista Casalnuovo, G.; Chinaglia, B.; et al. (2019) Minor Planet Bull. 46, 350-352.] geometric albedo albedo 0.287   0.048 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)   Tholen spectral type spec_T S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a medium resolution spectrum published by Chapman and Gaffey (1979) 1717 Arlon (1954 AC)          Discovered 1954-Jan-08 by Arend, S. at Uccle Reference: DISCOVERY.DB Last Updated: 2003-08-29 Alternate Designations  1954 AC = 1930 YU = 1941 BJ = 1946 UB = 1951 GQ = 1954 CE = 1977 FQ3 = 1978 PC5 = A915 CC  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2020-Jul-07 03:03 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin