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18851 Winmesser (1999 RP84)
Classification: Main-belt Asteroid          SPK-ID: 2018851
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 30 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1691794060284868 3.1429e-08  
a 2.378492962647192 7.4011e-09 au
q 1.976100935983604 7.3435e-08 au
i 3.584790075480644 3.1943e-06 deg
node 272.1772169945824 5.4373e-05 deg
peri 266.5980162732525 5.5212e-05 deg
M 105.4752465744804 9.1536e-06 deg
tp 2458807.946113369930
(2019-Nov-20.44611337)
3.3899e-05 TDB
period 1339.834736361898
3.67
6.2537e-06
1.712e-08
d
yr
n .268689854225993 1.2541e-09 deg/d
Q 2.780884989310779 8.6532e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2088  
   data-arc span      10661 days (29.19 yr)  
   first obs. used      1991-07-07  
   last obs. used      2020-09-13  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .46429  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 02:12:22  

Additional Information
 Earth MOID = .983173 au 
 Jupiter MOID = 2.20038 au 
 T_jup = 3.518 
[ 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 14.39   n/a E2021B10  
diameter diameter 7.609 km 0.072 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 27.327 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Pravec, P.; Wolf, M.; Sarounova, L. (2016) http://www.asu.cas.cz/~ppravec/neo.htm]
[Oey, J.; Groom, R. (2019) Minor Planet Bull. 46, 119-125.]
geometric albedo albedo 0.058   0.010 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

18851 Winmesser           Discovered 1999 Sept. 7 by the Lincoln Laboratory Near-Earth Asteroid Research Team at Socorro.
Winston Harmon Messer (b. 1986) was awarded third place in the 2003 Intel International Science and Engineering Fair for his medicine and health project. He attends the Presbyterian Christian School, Hattiesburg, Mississippi, U.S.A.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20040830/MPCPages.arcLast Updated: 2004-09-06

[ show close-approach data ]
Alternate Designations
 1999 RP84 = 1991 NX3 = 1998 KL64 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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