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 ]  
49781 (1999 XT7)
Classification: Main-belt Asteroid          SPK-ID: 2049781
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 19 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1828140186084607 9.3143e-08  
a 2.552247566494179 1.4655e-08 au
q 2.085660932379714 2.4535e-07 au
i 12.58781814120949 6.5953e-06 deg
node 340.9223623312299 2.8956e-05 deg
peri 79.9091445950942 3.6662e-05 deg
M 293.4488231041546 2.1515e-05 deg
tp 2458875.818797272206
(2020-Jan-27.31879727)
9.0218e-05 TDB
period 1489.301491589123
4.08
1.2827e-05
3.512e-08
d
yr
n .2417240579111156 2.082e-09 deg/d
Q 3.018834200608645 1.7334e-08 au
  Orbit Determination Parameters
   # obs. used (total)      1085  
   data-arc span      25191 days (68.97 yr)  
   first obs. used      1950-12-09  
   last obs. used      2019-11-28  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .45095  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-04 03:46:52  

Additional Information
 Earth MOID = 1.13962 au 
 Jupiter MOID = 2.43741 au 
 T_jup = 3.383 
[ 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 13.9   n/a MPO359075  
diameter diameter 5.240 km 0.221 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  
rotation period rot_per 6.436 h n/a LCDB (Rev. 2019-January); 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:
[Waszczak, A.; Chang, C.-K.; Ofeck, E.O.; Laher, F.; et al. (2015) Astron. J. 150, A75.]
geometric albedo albedo 0.256   0.037 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2011ApJ...741...68M)  

49781 (1999 XT7)          Discovered 1999-Dec-04 by Juels, C. W. at Fountain Hills
Reference: 20021120/Numbers.arcLast Updated: 2004-04-19

[ show close-approach data ]
Alternate Designations
 1999 XT7 = 1988 EF2 = 1992 BG5 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2020-Jan-18 11:55 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin