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1517 Beograd (1938 FD)
Classification: Main-belt Asteroid          SPK-ID: 2001517
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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Orbit Diagram
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Note: This Java-based orbit viewer will eventually be retired.

Note: Make sure you have Java enabled on your browser to see the applet. This applet is provided as a 3D orbit visualization tool. The applet 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. For accurate long-term ephemerides, please instead use our Horizons system.

Note: If the applet is not working, here are some notes that might help.
Orbit Viewer

Additional Notes: the orbits shown in the applet are color coded. The planets are white lines, and the asteroid/comet is a blue line. The bright white line indicates the portion of the orbit that is above the ecliptic plane, and the darker portion is below the ecliptic plane. Likewise for the asteroid/comet orbit, the light blue indicates the portion above the ecliptic plane, and the dark blue the portion below the ecliptic plane.

Orbit Viewer applet originally written and kindly provided by Osamu Ajiki (AstroArts), and further modified by Ron Baalke (JPL).

Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 34 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .0451687537119787 2.9501e-08  
a 2.717231352851775 8.7784e-09 au
q 2.594497399096347 8.1678e-08 au
i 5.272980977988691 3.4358e-06 deg
node 63.8624317346132 4.1932e-05 deg
peri 229.8783084081618 6.3099e-05 deg
M 21.14506510267997 4.6583e-05 deg
tp 2458904.406308296853
0.0002118 TDB
period 1636.01903541779
n .2200463394413177 1.0663e-09 deg/d
Q 2.839965306607204 9.175e-09 au
  Orbit Determination Parameters
   # obs. used (total)      3066  
   data-arc span      32491 days (88.96 yr)  
   first obs. used      1931-11-17  
   last obs. used      2020-10-31  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .41339  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-13 04:18:13  

Additional Information
 Earth MOID = 1.5821 au 
 Jupiter MOID = 2.23285 au 
 T_jup = 3.353 
[ 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 11.2   n/a MPO492768  
diameter diameter 39.524 km 0.219 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
rotation period rot_per 6.943 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:
[Behrend, R. (2005) Observatoire de Geneve web site,]
[Benishek, V.; Pilcher, F. (2014) Minor Planet Bull. 41, 263-264.]
[Polakis, T. (2019) Minor Planet Bull. 46-4, in press.]
geometric albedo albedo 0.050   0.006 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (  
SMASSII spectral type spec_B X   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)

1517 Beograd (1938 FD)          Discovered 1938-Mar-20 by Protitch, M. B. at Belgrade
Reference: DISCOVERY.DBLast Updated: 2003-08-29

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Close-Approach Data   ...sorted by Date/Time (TDB)
Date/Time (TDB) Time Uncertainty
Body Nominal Distance (au) Minimum Distance (au) Maximum Distance (au) V-relative (km/s) V-infinity (km/s) JD (TDB) Time Uncertainty (minutes) Semi-major axis (km) Semi-minor axis (km) range-LOV angle (deg) N-sigma BP Orbit Ref. Reference Modified
2051-Sep-03 19:40 00:02 Amphi 0.0235422374891491 0.0235391453594824 0.0235453300936802 2.67173771376491 2.67173762236801 2470418.319499216 1.57358879899071 229.789504378943 32.9677647195859 48.5705766695297 80641.0823727055 T 34 CATAB v2.0f-lin.ifort 2020-Nov-13 04:18:22 2020-Nov-13 04:18
2170-Oct-27 15:48 00:02 Hebe 0.0478094323477743 0.0478067874345286 0.0478120807625606 5.34958407261276 5.34958404830618 2513936.158458121 1.82580340295672 679.246561774 33.1197160335564 79.1486394760201 212020.25087405 T 34 CATAB v2.0f-lin.ifort 2020-Nov-13 04:18:22 2020-Nov-13 04:18

Alternate Designations
 1938 FD = 1931 VF = 1934 JF = 1935 ST = 1942 CD = 1952 JG = 1952 KM1 = 1971 VT = 1978 EW6 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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