+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   15703 Yrjola (1987 SU1) Classification: Main-belt Asteroid          SPK-ID: 2015703 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] [ show orbit diagram ] Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB Reference: JPL 30 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1329937558130989 3.266e-08   a 2.209322776989622 5.7378e-09 au q 1.915496643074347 7.1467e-08 au i 6.02464743899319 3.4916e-06 deg node 254.4988468080311 3.191e-05 deg peri 122.6003113930865 3.4844e-05 deg M 332.3130445144595 1.2457e-05 deg tp 2459092.748621156135 (2020-Aug-31.24862116) 4.1466e-05 TDB period 1199.463900375484 3.28 4.6727e-06 1.279e-08 d yr n .3001340848084751 1.1692e-09 deg/d Q 2.503148910904897 6.5009e-09 au   Orbit Determination Parameters    # obs. used (total)      1730      data-arc span      24218 days (66.31 yr)      first obs. used      1954-07-28      last obs. used      2020-11-16      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .48099      source      ORB      producer      Otto Matic      solution date      2020-Dec-18 03:00:44   Additional Information  Earth MOID = .925642 au   Jupiter MOID = 2.96794 au   T_jup = 3.640  [ hide covariance matrix ] Orbital Elements at Epoch 2457236.5 (2015-Aug-02.0) TDB Reference: JPL 30 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .1336833296028454 3.2689e-08   q 1.914149621472377 7.1626e-08 au tp 2456694.112575391248 (2014-Feb-05.61257539) 4.319e-05 TDB node 254.5286695809466 3.1911e-05 deg peri 122.7170612411428 3.4808e-05 deg i 6.024301528131346 3.4921e-06 deg   Orbit Determination Parameters    # obs. used (total)      1730      data-arc span      24218 days (66.31 yr)      first obs. used      1954-07-28      last obs. used      2020-11-16      planetary ephem.      DE431      SB-pert. ephem.      SB431-N16      condition code      0      norm. resid. RMS      .48099      source      ORB      producer      Otto Matic      solution date      2020-Dec-18 03:00:44   Additional Information  Jupiter MOID = 2.96794 au   T_jup = 3.640  Orbit Covariance (6×6)   e q tp node peri i e 1.068571182470131E-15 -2.335870768554684E-15 1.243905218476225E-13 -1.861938364333385E-14 4.834178772249869E-14 -2.465752577316077E-15 q -2.335870768554684E-15 5.130280076337083E-15 -3.471328271771333E-13 4.05933158602394E-14 -1.257170938736037E-13 5.336748663586221E-15 tp 1.243905218476225E-13 -3.471328271771333E-13 1.865356053216811E-9 -1.729923726793958E-11 6.093315158083457E-10 -1.580407748350246E-12 node -1.861938364333385E-14 4.05933158602394E-14 -1.729923726793958E-11 1.018342290852639E-9 -1.017516009157573E-9 -1.713994826540957E-11 peri 4.834178772249869E-14 -1.257170938736037E-13 6.093315158083457E-10 -1.017516009157573E-9 1.211592863177725E-9 1.661402549237162E-11 i -2.465752577316077E-15 5.336748663586221E-15 -1.580407748350246E-12 -1.713994826540957E-11 1.661402549237162E-11 1.219499272015599E-11 [ 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 14.8   n/a MPO337391   diameter diameter 2.832 km 0.112 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   geometric albedo albedo 0.349   0.034 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)   15703 Yrj{ö}l{ä}           Discovered 1987 Sept. 21 by E. Bowell at the Anderson Mesa Station of the Lowell Observatory. Ilkka Yrj{ö}l{ä} (b. 1959), a long-term dedicated amateur astronomer in Kuusankoski, Finland, who has observed meteor showers using systematic counts of reflections by meteor forward scatter. He has confirmed many meteor outbursts, including the 1994 Aurigid shower. NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character) Reference: MPC batch dated 2014-07-12 Last Updated: 2014-08-13 [ show close-approach data ] Alternate Designations  1987 SU1 = 1954 OY = 1989 EG12  [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ] 2021-Jan-21 09:58 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin