A Minor-Planet Follow-Up Page

If you are an astrometrist looking for specific targets, please consider the following discoveries which are not yet numbered and thus waiting for further astrometry. Just click on the check box of the object whose ephemeris you want, fill in the rest of the form and it will be sent to the Minor Planet Center which will respond with the ephemeris.

Other observers also have their own follow-up pages, check out this list of links.

A PDF document describing the use of the MPES is available.

Information on any known problems with this service is available.

Astrometric observations of any of the following objects should be sent directly to mpc@cfa.harvard.edu. Updated orbits will be available automatically through this page.

Display ephemerides or summary

The following objects are available:

Discovered by D. Chestnov & A. Novichonok:

(228165) Mezentsev
(231649) Korotkiy
(264156) 2009 WV5
(269447) 2009 SH245
(269568) 2009 WS105
(274981) Petrsu
(279340) 2009 YM6
(281811) 2009 WF139
(296747) 2009 UB1
(296818) 2009 WW5
(296866) 2009 XB7
(328704) 2009 TW2
(328734) 2009 UA1
(331056) 2009 WX
(367864) 2011 CB86
(369400) 2009 WS7
(379283) 2009 VF1
2009 SW103
2009 TY9
2009 TA10
2009 UH2
2009 VG1
2009 WD1
2009 WY10
2009 WA25
2009 XE2
2009 XL2
2009 XM2
2009 XN2
2009 XW8
2009 XM9
2009 YP6
2009 YV21
2010 AC4
2010 AC40
2010 AU60
2010 AV60
2010 AP61
2010 AC79
2010 CR23
2010 RD82
2010 RL130
2010 TY

Discovered by E. Evdokimova:

(281825) 2009 YA7
(328830) 2009 WX23
2009 WW23

Discovered by A. Smirnov:

2010 AT61

select all


By default, ephemerides are geocentric, begin now and are for 20 days at 1 day intervals.

Start date for ephemerides: Number of dates to output

Ephemeris interval: Ephemeris units: days hours minutes seconds

For daily ephemerides, enter desired offset from 0h UT: hours

Observatory code:

Display positions in: truncated sexagesimal or full sexagesimal or decimal units

Display motions as: "/sec "/min "/hr °/day

Total motion and direction Separate R.A. and Decl. sky motions Separate R.A. and Decl. coordinate motions

Suppress output if sun above local horizon

Suppress output if object below local horizon

Generate perturbed ephemerides for unperturbed orbits

Measure azimuths:
westwards from the south meridian
eastwards from the north meridian

Also display elements for epoch

Format for elements output:

none MPC 1-line MPC 8-line
SkyMap (SkyMap Software) Guide (Project Pluto) xephem (E. Downey)
Home Planet (J. Walker) MyStars! (Relative Data Products) TheSky (Software Bisque)
Starry Night (Sienna Software) Deep Space (D. S. Chandler) PC-TCS (D. Harvey)
Earth Centered Universe (Nova Astronomics) Dance of the Planets (ARC) MegaStar V4.x (E.L.B. Software)
SkyChart 2000.0 (Southern Stars Software) Voyager II (Carina Software) SkyTools (CapellaSoft)
Autostar (Meade Instruments)

If you select 8-line MPC format, you may display the residual block for the objects selected:

Show residuals blocks.

If you select 8-line MPC format the elements will be displayed with the ephemerides. If you select any format other than 8-line MPC format, only the elements are returned. In such cases your browser should download the elements file and save it to your local disk.

Supplementary Information

The summary lists the current J2000.0 coordinates, visual magnitude and solar elongation of the selected minor planets, as well as information on the date of last observation (where available), forthcoming opposition data and details on the latest published orbit. The opposition data lists the date of the next opposition and the declination and visual magnitude at that time.

The list of available formats for the orbital elements was correct at the time this document was prepared. It is possible that the Minor Planet Center now supports further formats. If you select the summary option, any newly supported formats will be listed.

The elements supplied are the latest published elements for the specified objects. Elements will be found even if the designation you enter is a non-principal designation in an identification or if the object has been numbered.

Ephemerides can be supplied for objects with only Väisälä elements, but the elements themselves are not supplied.

The ephemerides supplied for minor planets and comets are perturbed (if the orbits were computed with perturbations) and can be generated over the time period 1900 to 2040. Objects with unperturbed orbit solutions will return unperturbed ephemerides. Objects must be identified in images by their motion, not by their apparent closeness to a predicted position.

The time-scale of the supplied ephemerides is UTC.

If you desire a topocentric ephemeris, enter your observatory code in the appropriate box. When local circumstances are displayed, the azimuths are reckoned westwards from the south meridian.

As an aide-mémoire, the packed form of the object's designation (as used on the astrometric observation record) is displayed immediately above the ephemeris.

This service utilises the Minor Planet Ephemeris Service, courtesy of the IAU's Minor Planet Center.

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