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903 Nealley (A918 RH)
Classification: Outer Main-belt Asteroid          SPK-ID: 2000903
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB
Reference: JPL 55 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .0453521094015801 9.6148e-09  
a 3.238718749617243 1.1996e-08 au
q 3.091836022563653 3.5621e-08 au
i 11.78137130437496 3.9793e-07 deg
node 159.3798735732476 1.884e-06 deg
peri 234.0342708341477 2.3604e-05 deg
M 141.2924766463578 2.5706e-05 deg
tp 2458364.945433457295
(2018-Sep-03.44543346)
0.0001506 TDB
period 2128.914795005313
5.83
1.1828e-05
3.238e-08
d
yr
n .1691002386965429 9.3951e-10 deg/d
Q 3.385601476670833 1.254e-08 au
  Orbit Determination Parameters
   # obs. used (total)      3358  
   data-arc span      37446 days (102.52 yr)  
   first obs. used      1918-09-06  
   last obs. used      2021-03-15  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .41688  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-Apr-12 11:36:18  

Additional Information
 Earth MOID = 2.10898 au 
 Jupiter MOID = 1.84254 au 
 T_jup = 3.150 
[ 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 10.12   n/a E2021B10  
diameter diameter 58.065 km 0.373 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 19.72 h n/a LCDB (Rev. 2020-October); 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:
[Warner, B.D (2012) Minor Planet Bull. 39, 16-21.]
geometric albedo albedo 0.054   0.009 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

903 Nealley (A918 RH)          Discovered 1918-Sep-13 by Palisa, J. at Vienna
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Alternate Designations
 A918 RH = 1927 DB = 1930 SC1 = 1935 QO = 1936 TJ = 1941 QG = 1947 QC = 1951 GE1 = 1951 JE = 1952 KK = 1952 MO = 1960 WU = A918 WC = A924 SD 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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