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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 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04924550981019118 4.7002e-08  
a 3.2205989456638 2.0354e-08 au
q 3.061998908690422 1.4994e-07 au
i 15.44948667050109 4.8729e-06 deg
node 33.60508744093097 1.6281e-05 deg
peri 147.6404127007396 4.3681e-05 deg
M 175.7104022101454 4.0146e-05 deg
tp 2457970.117750127636
(2017-Aug-04.61775013)
0.00023497 TDB
period 2111.073705872112
5.78
2.0013e-05
5.479e-08
d
yr
n .1705293372745029 1.6166e-09 deg/d
Q 3.379198982637178 2.1356e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2440  
   data-arc span      29510 days (80.79 yr)  
   first obs. used      1939-10-18  
   last obs. used      2020-08-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .43811  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-24 22:56:58  

Additional Information
 Earth MOID = 2.07025 au 
 Jupiter MOID = 1.59506 au 
 T_jup = 3.130 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456659.5 (2014-Jan-02.0) TDB
Reference: JPL 37 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .04607295056753748 4.7551e-08  
q 3.075391501708864 1.5134e-07 au
tp 2455874.388781378530
(2011-Nov-08.88878138)
0.00025118 TDB
node 33.68562716159776 1.6258e-05 deg
peri 150.9675508194161 4.5855e-05 deg
i 15.45977164714809 4.8774e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2440  
   data-arc span      29510 days (80.79 yr)  
   first obs. used      1939-10-18  
   last obs. used      2020-08-03  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .43811  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Aug-24 22:56:58  

Additional Information
 Jupiter MOID = 1.59506 au 
 T_jup = 3.130 
Orbit Covariance (6×6)
  e q tp node peri i
e 2.2611141678296E-15 -7.136980475537434E-15 -1.007582479402133E-12 3.251643679374824E-15 -1.31910048476194E-13 -3.677637469933118E-15
q -7.136980475537434E-15 2.290369742201408E-14 2.732102475528395E-12 -1.222245121184056E-14 3.649573056315355E-13 1.320723655103497E-14
tp -1.007582479402133E-12 2.732102475528395E-12 6.309060587991507E-8 1.321361021888046E-11 1.078945224155311E-8 1.204852437131941E-11
node 3.251643679374824E-15 -1.222245121184056E-14 1.321361021888046E-11 2.643127394467096E-10 -2.523513781239043E-10 -2.231986781937677E-11
peri -1.31910048476194E-13 3.649573056315355E-13 1.078945224155311E-8 -2.523513781239043E-10 2.102715420144611E-9 2.366544243998466E-11
i -3.677637469933118E-15 1.320723655103497E-14 1.204852437131941E-11 -2.231986781937677E-11 2.366544243998466E-11 2.378865366021023E-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 ]
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