Skip Page Navigation
NASA JPL Caltech
NASA Logo - Jet Propulsion Laboratory + View the NASA Portal
+ Center for Near-Earth Object Studies
JPL Home Earth Solar System Stars & Galaxies Technology
JPL Solar System Dynamics
BODIES ORBITS EPHEMERIDES TOOLS PHYSICAL DATA DISCOVERY FAQ SITE MAP
IMPORTANT: The SSD Announcement email list is now available. Major changes are coming in the near future, including possible hostname and/or URL changes. To be notified of such changes, subscribe to this email list.

Please visit this page for more details.


JPL Small-Body Database Browser
Search: [ help ]  
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 ]

[ hide orbit diagram ]

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.


[ revert to old Java-based viewer ]

Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 89 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3570522589357246 1.1018e-07  
a 1.022636911046168 8.7973e-09 au
q .6575020918860822 1.0706e-07 au
i 4.917323004209094 2.6045e-06 deg
node 180.2183503523138 2.4253e-05 deg
peri 255.3412819085898 2.3541e-05 deg
M 127.2760497219521 2.7962e-05 deg
tp 2458866.955867935979
(2020-Jan-18.45586794)
2.7635e-05 TDB
period 377.7292558032275
1.03
4.8742e-06
1.334e-08
d
yr
n .9530635884543099 1.2298e-08 deg/d
Q 1.387771730206254 1.1938e-08 au

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A2 [EST] -3.902299670013544E-14 1.02E-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)      337  
   # delay obs. used      2  
   # Doppler obs. used      2  
   data-arc span      11322 days (31.00 yr)  
   first obs. used      1989-03-31  
   last obs. used      2020-03-30  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .4344  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Mar-31 06:06:26  

Additional Information
 Earth MOID = .00354486 au 
 Jupiter MOID = 3.87441 au 
 T_jup = 5.913 
 Nongravitational accels. using nonstandard g(r) = (1 au/ r)^2 
[ hide covariance matrix ]
Orbital Elements at Epoch 2457496.5 (2016-Apr-18.0) TDB
Reference: JPL 89 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .3569995046228155 1.1e-07  
q .6574479668337716 1.0697e-07 au
tp 2457356.637528873263
(2015-Nov-30.13752887)
7.1408e-06 TDB
node 180.276640942393 2.4224e-05 deg
peri 255.2822657496354 2.35e-05 deg
i 4.919438567016039 2.6034e-06 deg

Additional Model Parameters
 Parameter Value Uncertainty (1-sigma) 
A2 [EST] -3.902299670013544E-14 1.02E-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)      337  
   # delay obs. used      2  
   # Doppler obs. used      2  
   data-arc span      11322 days (31.00 yr)  
   first obs. used      1989-03-31  
   last obs. used      2020-03-30  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .4344  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Mar-31 06:06:26  

Additional Information
 Jupiter MOID = 3.87441 au 
 T_jup = 5.913 
 Nongravitational accels. using nonstandard g(r) = (1 au/ r)^2 
Orbit Covariance (7×7)
  e q tp node peri i A2
e 1.209954080873678E-14 -1.176565757909129E-14 7.255997318080317E-13 1.134452041848723E-12 -5.937703276727455E-13 1.420693582447233E-13 1.02742405553852E-21
q -1.176565757909129E-14 1.14417630873562E-14 -7.033723049931842E-13 -1.108061600090068E-12 5.829415898748934E-13 -1.38956995108193E-13 -9.981635150812097E-22
tp 7.255997318080317E-13 -7.033723049931842E-13 5.09916168256616E-11 5.214226187369057E-11 -1.668500575811348E-11 4.848858059953806E-12 6.167919486433753E-20
node 1.134452041848723E-12 -1.108061600090068E-12 5.214226187369057E-11 5.867926599416661E-10 -5.559301228509095E-10 1.408751383969579E-11 9.042033941013791E-20
peri -5.937703276727455E-13 5.829415898748934E-13 -1.668500575811348E-11 -5.559301228509095E-10 5.522600145385797E-10 -1.080744445993997E-11 -4.356755197720764E-20
i 1.420693582447233E-13 -1.38956995108193E-13 4.848858059953806E-12 1.408751383969579E-11 -1.080744445993997E-11 6.777792294650512E-12 1.146455488987657E-20
A2 1.02742405553852E-21 -9.981635150812097E-22 6.167919486433753E-20 9.042033941013791E-20 -4.356755197720764E-20 1.146455488987657E-20 1.039480074326782E-28

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

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2020-Apr-05 07:02 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin