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 ]  
2405 Welch (1963 UF)
Classification: Outer Main-belt Asteroid          SPK-ID: 2002405
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 2458600.5 (2019-Apr-27.0) TDB
Reference: JPL 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .136864038490536 3.8925e-08  
a 3.204422294881441 1.8222e-08 au
q 2.765852118574855 1.2772e-07 au
i 2.250654643987678 4.4535e-06 deg
node 128.0750082448853 0.00010693 deg
peri 3.2110216527869 0.00010797 deg
M 134.3214480663197 1.5124e-05 deg
tp 2457818.753567069149
(2017-Mar-06.25356707)
8.7127e-05 TDB
period 2095.188221289532
5.74
1.7872e-05
4.893e-08
d
yr
n .1718222717854102 1.4656e-09 deg/d
Q 3.642992471188026 2.0716e-08 au
  Orbit Determination Parameters
   # obs. used (total)      2331  
   data-arc span      24851 days (68.04 yr)  
   first obs. used      1951-08-06  
   last obs. used      2019-08-20  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .45742  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Sep-23 19:24:35  

Additional Information
 Earth MOID = 1.78088 au 
 Jupiter MOID = 1.40438 au 
 T_jup = 3.177 
[ hide covariance matrix ]
Orbital Elements at Epoch 2456310.5 (2013-Jan-18.0) TDB
Reference: JPL 25 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1332704064543383 3.8772e-08  
q 2.777605299962224 1.2584e-07 au
tp 2455717.859628410466
(2011-Jun-05.35962841)
8.9602e-05 TDB
node 128.2616100701921 0.00010733 deg
peri 2.303792653305856 0.00010845 deg
i 2.247229325921454 4.4454e-06 deg
  Orbit Determination Parameters
   # obs. used (total)      2331  
   data-arc span      24851 days (68.04 yr)  
   first obs. used      1951-08-06  
   last obs. used      2019-08-20  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .45742  
   source      ORB  
   producer      Otto Matic  
   solution date      2019-Sep-23 19:24:35  

Additional Information
 Jupiter MOID = 1.40438 au 
 T_jup = 3.177 
Orbit Covariance (6×6)
  e q tp node peri i
e 1.503262939275065E-15 -4.844290741723547E-15 7.703973459541418E-13 -2.522184223816591E-15 1.319464119377214E-13 -2.025498709063443E-16
q -4.844290741723547E-15 1.583567135579015E-14 -2.522016216111597E-12 1.490431967809472E-14 -4.254457028227985E-13 8.256092659135235E-16
tp 7.703973459541418E-13 -2.522016216111597E-12 8.028565213250299E-9 -2.355001898811067E-11 1.420178416006098E-9 -8.960890255103602E-13
node -2.522184223816591E-15 1.490431967809472E-14 -2.355001898811067E-11 1.152039940977073E-8 -1.151432292721619E-8 1.089089206567798E-10
peri 1.319464119377214E-13 -4.254457028227985E-13 1.420178416006098E-9 -1.151432292721619E-8 1.176131894093015E-8 -1.089606957366946E-10
i -2.025498709063443E-16 8.256092659135235E-16 -8.960890255103602E-13 1.089089206567798E-10 -1.089606957366946E-10 1.976154831261288E-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 12.09   n/a IRAS-A-FPA-3-RDR-IMPS-V6.0 IRAS observations used: 5
diameter diameter 22.360 km 0.412 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
geometric albedo albedo 0.052   0.007 urn:nasa:pds:neowise_diameters_albedos::2.0[mainbelt] (http://adsabs.harvard.edu/abs/2012ApJ...759L...8M)  
B-V BV 0.698   0.037 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=1.10 deg.
U-B UB 0.312   0.055 EAR-A-5-DDR-UBV-MEAN-VALUES-V1.2 #obs=1; phase=1.10 deg.
Tholen spectral type spec_T BCU:   n/a EAR-A-5-DDR-TAXONOMY-V4.0 used 7 color indices

2405 Welch (1963 UF)          Discovered 1963-Oct-18 by Goethe Link Observatory at Brooklyn
Discovered by the Indiana Asteroid Program, Goethe Link Observatory, University of Indiana. This program was conceived and directed by F. K. Edmondson; the plates were blinked and measured astrometrically by B. Potter and, following her retirement, by D. Owings; and the photometry was performed under the direction of T. Gehrels. During the years 1947-1967, in which the plates were exposed, a large number of people participated in various aspects of the program.
Reference: DISCOVERY.DBLast Updated: 2003-08-29

[ show close-approach data ]
Alternate Designations
 1963 UF = 1965 AG1 = 1969 VV = 1972 JQ1 = 1974 RR = 1975 WG1 = 1977 DN9 = 1977 FV1 = 1979 OJ6 = 1980 RC2 = 1980 TF = 1981 YB2 
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
ABOUT SSD CREDITS/AWARDS PRIVACY/COPYRIGHT GLOSSARY LINKS
FirstGov
(server date/time)  
NASA Home Page
Site Manager:   Ryan S. Park
Webmaster  Alan B. Chamberlin