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3873 Roddy (1984 WB)
Classification: Mars-crossing Asteroid          SPK-ID: 2003873
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]

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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 39 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1341233853487591 9.3473e-09  
a 1.891899810993167 4.4383e-09 au
q 1.638151803602086 1.907e-08 au
i 23.35254549190449 5.3487e-07 deg
node 250.0395403628971 9.706e-07 deg
peri 267.6890135046326 6.2454e-06 deg
M 235.1019110451787 7.8409e-06 deg
tp 2459530.260718109723
(2021-Nov-11.76071811)
2.1244e-05 TDB
period 950.4857881567895
2.60
3.3447e-06
9.157e-09
d
yr
n .3787536904661382 1.3328e-09 deg/d
Q 2.145647818384248 5.0336e-09 au
  Orbit Determination Parameters
   # obs. used (total)      2974  
   data-arc span      13270 days (36.33 yr)  
   first obs. used      1984-11-19  
   last obs. used      2021-03-20  
   planetary ephem.      DE441  
   SB-pert. ephem.      SB441-N16  
   condition code      0  
   norm. resid. RMS      .3533  
   source      ORB  
   producer      Otto Matic  
   solution date      2021-May-03 21:16:24  

Additional Information
 Earth MOID = .784988 au 
 Jupiter MOID = 3.07138 au 
 T_jup = 3.848 
[ 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 12.91   n/a E2021B10  
diameter diameter 5.021 km 0.581 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2015ApJ...814..117N)  
rotation period rot_per 2.4782 h n/a LCDB (Rev. 2020-October); Warner et al., 2009 Published Reference List:
[Warner, B.D. (2006) Minor Planet Bull. 33, 58-62.]
[Warner, B.D. (2008) Minor Planet Bull. 35, 56-60.]
[Warner, B.D. (2009) Minor Planet Bull. 36, 172-176.]
[Warner, B.D. (2011) Minor Planet Bull. 38, 82-86.]
[Warner, B.D. (2013). Minor Planet Bull. 40, 36-42.]
[Pravec, P.; Wolf, M.; Sarounova, L. (2015) http://www.asu.cas.cz/~ppravec/neo.htm]
[Klinglesmith III, D.A.; Hendrickx, S.; Madden, K.; Montgomery, S. (2016) Minor Planet Bull. 43, 123-128.]
[Warner, B.D. (2016) Minor Planet Bull. 43, 57-65.]
geometric albedo albedo 0.419   0.164 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2015ApJ...814..117N)  
SMASSII spectral type spec_B S   n/a EAR-A-5-DDR-TAXONOMY-V4.0 based on a high-resolution spectrum by Xu et al. (1995) or Bus and Binzel (2002)

3873 Roddy (1984 WB)          Discovered 1984-Nov-21 by Shoemaker, C. at Palomar
Reference: DISCOVERY.DBLast Updated: 2003-08-29

Alternate Designations
 1984 WB = 1953 XK1 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ]
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