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 ]  
2826 Ahti (1939 UJ)
Classification: Outer Main-belt Asteroid          SPK-ID: 2002826
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

[ show orbit diagram ]
Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 36 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04924554681264735 4.7096e-08  
a 3.220598942695861 2.0572e-08 au
q 3.061998786698569 1.5022e-07 au
i 15.44947955673126 4.8876e-06 deg
node 33.60508918602124 1.6391e-05 deg
peri 147.6404499827421 4.432e-05 deg
M 175.7103591998583 4.0624e-05 deg
tp 2457970.118003768308
(2017-Aug-04.61800377)
0.000238 TDB
period 2111.073702953925
5.78
2.0227e-05
5.538e-08
d
yr
n .1705293375102296 1.6339e-09 deg/d
Q 3.379199098693153 2.1585e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2343  
   data-arc span      29267 days (80.13 yr)  
   first obs. used      1939-10-18  
   last obs. used      2019-12-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .44394  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-13 21:21:02  

Additional Information
 Earth MOID = 2.07025 au 
 Jupiter MOID = 1.59506 au 
 T_jup = 3.130 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456600.5 (2013-Nov-04.0) TDB
Reference: JPL 36 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04600299786963379 4.7636e-08  
q 3.075836455334553 1.5162e-07 au
tp 2455874.564833883148
(2011-Nov-09.06483388)
0.00025542 TDB
node 33.68851254315494 1.6368e-05 deg
peri 151.0117843419071 4.6605e-05 deg
i 15.45957597700913 4.8919e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2343  
   data-arc span      29267 days (80.13 yr)  
   first obs. used      1939-10-18  
   last obs. used      2019-12-04  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .44394  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Dec-13 21:21:02  

Additional Information
 Jupiter MOID = 1.59506 au 
 T_jup = 3.130 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.269148700954357E-15 -7.161618691442932E-15 -1.036908471963809E-12 2.517998759341059E-15 -1.360620046395501E-13 -3.770110865407424E-15
q -7.161618691442932E-15 2.298814241520541E-14 2.6962430888807E-12 -9.749953401354138E-15 3.552773318914507E-13 1.350087553429893E-14
tp -1.036908471963809E-12 2.6962430888807E-12 6.523842788016134E-8 1.329744535247511E-11 1.116572482722616E-8 1.198125917692995E-11
node 2.517998759341059E-15 -9.749953401354138E-15 1.329744535247511E-11 2.678978157041731E-10 -2.558002569631532E-10 -2.180447333214069E-11
peri -1.360620046395501E-13 3.552773318914507E-13 1.116572482722616E-8 -2.558002569631532E-10 2.172005922869448E-9 2.315296791470744E-11
i -3.770110865407424E-15 1.350087553429893E-14 1.198125917692995E-11 -2.180447333214069E-11 2.315296791470744E-11 2.393041903912979E-11

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 11.0   n/a MPO435724  
diameter diameter 39.975 km 0.157 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2014ApJ...791..121M)  
rotation period rot_per 24. h n/a LCDB (Rev. 2019-August); Warner et al., 2009 lower-limit; Result based on fragmentary lightcurve(s), may be completely wrong.
Published Reference List:
[Behrend, R. (2006) Observatoire de Geneve web site, http://obswww.unige.ch/~behrend/page_cou.html]
geometric albedo albedo 0.023   0.004 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  

2826 Ahti (1939 UJ)          Discovered 1939-Oct-18 by Vaisala, Y. at Turku
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 1939 UJ = 1942 FH = 1950 TG3 = 1968 UT2 = 1979 RG = 1980 VK1 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov 2020-May-25 18:40 UT
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin