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
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 ]  
18647 Vaclavhubner (1998 FD2)
Classification: Main-belt Asteroid          SPK-ID: 2018647
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 20 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04394931177619475 9.2804e-08  
a 2.538208995769607 1.2633e-08 au
q 2.426656457261386 2.3832e-07 au
i 3.719790627782527 6.7794e-06 deg
node 141.1424317336518 7.4173e-05 deg
peri 39.91586091940678 9.35e-05 deg
M 171.0456997992422 5.6669e-05 deg
tp 2458298.722960879416
0.00023072 TDB
period 1477.030608661519
n .2437322543547225 1.8196e-09 deg/d
Q 2.649761534277828 1.3188e-08 au
  Orbit Determination Parameters
   # obs. used (total)      922  
   data-arc span      9310 days (25.49 yr)  
   first obs. used      1992-11-19  
   last obs. used      2018-05-17  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .59247  
   source      ORB  
   producer      Otto Matic  
   solution date      2018-Oct-03 17:50:08  

Additional Information
 Earth MOID = 1.43073 au 
 Jupiter MOID = 2.30836 au 
 T_jup = 3.443 
[ 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 15.3   n/a MPO299097  
diameter diameter 2.727 km 0.644 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
rotation period rot_per 33.10 h n/a LCDB (Rev. 2019-August); 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:
[Chang, C.K.; Ip, W.-H.; Lin, H.-W.; Cheng, Y.C.; et al. (2015) Astrophys. J. Supp. Ser. 219, A27.]
geometric albedo albedo 0.198   0.103 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  

18647 Václavhübner           Discovered 1998 Mar. 21 by P. Pravec at Ondřejov.
Václav Hübner (1922-2000) was an enthusiastic amateur astronomer who contributed much to astronomical education and amateur astronomical activities in Pardubice and elsewhere in eastern Bohemia.
NOTE: some special characters may not display properly (any characters within {} are an attempt to place the proper accent above a character)
Reference: 20010509/MPCPages.arcLast Updated: 2009-05-11

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
FirstGov 2020-Feb-19 16:41 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin