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4581 Asclepius (1989 FC)
Classification: Apollo [NEO, PHA]          SPK-ID: 2004581
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.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 88 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .357052267864516 1.3576e-07  
a 1.022636911569285 1.0915e-08 au
q .657502083091507 1.3185e-07 au
i 4.917323878156523 2.6947e-06 deg
node 180.2183585562669 2.5379e-05 deg
peri 255.3412732523641 2.3951e-05 deg
M 127.2760482426474 3.5027e-05 deg
tp 2458866.955869385667
(2020-Jan-18.45586939)
3.4628e-05 TDB
period 377.7292560930612
1.03
6.0477e-06
1.656e-08
d
yr
n .9530635877230191 1.5259e-08 deg/d
Q 1.387771740047062 1.4813e-08 au

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A2 [EST] -3.864088051862209E-14 1.236E-14
ALN [SET] 1. n/a
NK [SET] 0. n/a
NM [SET] 2. n/a
R0 [SET] 1. n/a
  Orbit Determination Parameters
   # obs. used (total)      335  
   # delay obs. used      2  
   # Doppler obs. used      2  
   data-arc span      10997 days (30.11 yr)  
   first obs. used      1989-03-31  
   last obs. used      2019-05-10  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .44128  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Jun-11 23:30:26  

Additional Information
 Earth MOID = .00354485 au 
 Jupiter MOID = 3.87441 au 
 T_jup = 5.913 
 Nongravitational accels. using nonstandard g(r) = (1 au/ r)^2 
[ 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 20.7   n/a MPO267726  
rotation period rot_per 8.008 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Published Reference List:
[Pravec, P.; Wolf, M.; Sarounova, L. (2019) http://www.asu.cas.cz/~ppravec/neo.htm]
[Warner, B.D.; Stephens, R.D. (2019) Minor Planet Bull. 46-4, submitted. (NEA Gaggle) http://www.planetarysciences.org/lightcurves.html]

4581 Asclepius (1989 FC)          Discovered 1989-Mar-31 by Holt and Thomas at Palomar
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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