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18852 (1999 RP91)
Classification: Main-belt Asteroid          SPK-ID: 2018852
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 31 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .161038840445199 3.2656e-08  
a 3.173245764638597 1.8637e-08 au
q 2.662229946253558 1.1008e-07 au
i 1.441316652736087 3.6761e-06 deg
node 56.72223992635569 0.00014619 deg
peri 236.4012418442991 0.00014672 deg
M 285.2589740426428 1.3706e-05 deg
tp 2459429.157616455248
(2021-Aug-02.65761646)
8.0244e-05 TDB
period 2064.685893018559
5.65
1.8189e-05
4.98e-08
d
yr
n .1743606624219639 1.5361e-09 deg/d
Q 3.684261583023635 2.1638e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1913  
   data-arc span      15923 days (43.59 yr)  
   first obs. used      1976-09-24  
   last obs. used      2020-04-29  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .48873  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-May-20 04:54:09  

Additional Information
 Earth MOID = 1.64645 au 
 Jupiter MOID = 1.51167 au 
 T_jup = 3.181 
[ 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 13.0   n/a MPO347671  
diameter diameter 11.994 km 0.161 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 9.66 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Chang, C.-K.; Ip, W.-H.; Cheng, Y.-C.; Ngeow, C.-C.; et al. (2014) Astrophys. J. 788, A17.]
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.072   0.010 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

18852 (1999 RP91)          Discovered 1999-Sep-07 by LINEAR at Socorro
Reference: 20001111/Numbers.arcLast Updated: 2004-04-19

[ hide close-approach data ]
Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
(days_HH:MM)
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
1968-Mar-10 16:20 00:02 Jupiter 1.97456970242618 1.97456867553469 1.97457072931778 2.7436117473014 2.58253251301241 2439926.180870630 1.61581716960706 70.1143945201904 19.4036941294395 -67.762477775413 2192594.36784708 T 31 CATAB v2.0f-lin.ifort 2020-May-20 04:54:23 2020-May-20 04:54
1979-Jan-12 04:26 00:01 Jupiter 1.68353204058964 1.68353137113985 1.68353271003876 1.75964134687295 1.44571541651781 2443885.684875604 1.23434639796534 59.1810806844616 30.553485630905 -87.4286317943144 1910122.7051118 T 31 CATAB v2.0f-lin.ifort 2020-May-20 04:54:23 2020-May-20 04:54
1989-Nov-22 16:44 < 00:01 Jupiter 1.5175710571048 1.51757073658613 1.51757137762303 1.3759484029393 0.881445904756959 2447853.197167884 0.807619294497056 174.16433679232 93.378481060242 -15.2933673586756 2504856.62840661 T 31 CATAB v2.0f-lin.ifort 2020-May-20 04:54:23 2020-May-20 04:54
2000-Sep-29 03:16 < 00:01 Jupiter 1.57794565791036 1.57794527662933 1.57794603919113 1.78912853308741 1.45856252061431 2451816.636081479 0.452673977081563 55.6037185993721 33.2854727062604 78.1514308914439 2406469.53670785 T 31 CATAB v2.0f-lin.ifort 2020-May-20 04:54:23 2020-May-20 04:54
2011-Jul-16 02:32 < 00:01 Jupiter 1.82495358191839 1.82495318608727 1.82495397774951 3.06039554635907 2.90478113412242 2455758.605783845 0.214135256511058 33.4503775540287 11.9521273963502 -81.6521615215372 3455036.12238263 T 31 CATAB v2.0f-lin.ifort 2020-May-20 04:54:23 2020-May-20 04:54
2098-Jul-07 11:10 00:02 Jupiter 1.8693682428929 1.86936710696208 1.8693693788234 2.32608758839269 2.12237387888733 2487526.964947361 2.07980621879376 71.9060336028747 11.2708773390807 -78.5881122769205 1740907.07722358 T 31 CATAB v2.0f-lin.ifort 2020-May-20 04:54:23 2020-May-20 04:54
2109-May-13 09:28 00:02 Jupiter 1.61405865296014 1.61405771032477 1.6140595955936 1.54975487837908 1.16283452326916 2491488.894156605 2.41800062189191 118.535077051562 74.0792770939763 11.0355776568429 1248138.10964359 T 31 CATAB v2.0f-lin.ifort 2020-May-20 04:54:23 2020-May-20 04:54
2120-Mar-26 20:56 00:03 Jupiter 1.52924595260909 1.52924564482487 1.52924626039288 1.44563875568342 0.991012857922105 2495459.372240168 2.83187553353183 139.650254113584 82.4330742501197 -29.290127081201 2497958.76746507 T 31 CATAB v2.0f-lin.ifort 2020-May-20 04:54:23 2020-May-20 04:54
2131-Jan-25 05:18 00:03 Jupiter 1.65925273397151 1.65925144531493 1.65925402262875 2.15603443417178 1.90460385031365 2499415.720682446 3.43067337875159 119.930938761608 8.61411474166372 82.8774803408015 2024890.32670927 T 31 CATAB v2.0f-lin.ifort 2020-May-20 04:54:23 2020-May-20 04:54
2141-Nov-07 01:19 00:04 Jupiter 1.93357282089265 1.93357086198532 1.93357477980515 3.64380929527096 3.52153723808856 2503354.555129982 3.80274103420333 192.95729186478 16.1888887851173 -67.1329317644409 3224514.05660545 T 31 CATAB v2.0f-lin.ifort 2020-May-20 04:54:23 2020-May-20 04:54

Alternate Designations
 1999 RP91 = 1976 SL1 = 1987 ON1 = 1998 LH3 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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