+ 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 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 70 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .128557206855544 7.407e-09   a 2.196628613095045 4.5905e-09 au q 1.914236174096579 1.5678e-08 au i 6.190187006918906 2.3164e-07 deg node 340.4262405666985 2.2342e-06 deg peri 116.160766656369 6.3964e-06 deg M 227.3533778375612 5.4144e-06 deg tp 2459638.654297667115 (2022-Feb-28.15429767) 1.8306e-05 TDB period 1189.141077162135 3.26 3.7276e-06 1.021e-08 d yr n .3027395209146537 9.4899e-10 deg/d Q 2.479021052093512 5.1806e-09 au   Orbit Determination Parameters    # obs. used (total)      3013      data-arc span      32815 days (89.84 yr)      first obs. used      1930-12-20      last obs. used      2020-10-23      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .40004      source      ORB      producer      Otto Matic      solution date      2021-Apr-12 12:50:43   Additional Information  Earth MOID = .940156 au   Jupiter MOID = 2.65961 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 12.31   n/a E2021B10   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. 2020-October); 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 ] 2021-May-14 00:33 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin