Asteroids around opposition

Charts show 1 month either side of opposition and are tabulated in order of opposition date. Positions are calculated from the latest osculating elements given in the Minor Planet Center's database. Star data are from the Hipparcos/Tycho databases.

Our aim is to provide charts for all minor planets that reach magnitude 12.0 or brighter at opposition (as estimated from G and H parameters*). A chart for any object at any one date & time can also be plotted from our "What's observable" applet.

The following table gives data at opposition. An asterisk after an object's name means that an ephemeris may be found in the printed Handbook.

The charts are interactive, to assist magnitude estimation. Green boxes indicate stars with a colour index similar to the Sun (0.60 < B - V < 0.72). For further explanation see the comet charts page.

NEW (2013 Dec 2) Starting with 1021 Flammario the charts have ephemeris data built in too. If the cursor is moved along the track of an asteroid, data for 0h UT on every day appear in blue. You may need to refresh your browser's cache (Ctrl-F5 in Windows) on a chart to get the latest script file.

* Magnitude estimates are based on H, G, r, Δ and phase angle. The theory behind this was explained in "The H and G magnitude system for asteroids" by Roger Dymock in the BAA Journal: J.Br.Astron.Assoc. 117,6,2007 p.342.


The following may be of interest to those requiring older confrmation data.

Link to chartOpposition
6 Hebe*2014-Nov-15 17h8.05-8.892.001.0713.570.0096
8 Flora2015-Feb-15 10h9.05+18.452.271.282.620.0119
354 Eleonora2015-Mar-05 14h9.64+17.882.491.515.060.0113
511 Davida2015-Mar-18 00h11.77-1.372.981.990.950.0085
113 Amalthea2015-Sep-11 01h11.89-10.202.531.532.310.0104
45 Eugenia2015-Sep-16 15h11.21-6.772.801.801.590.0094
250 Bettina2016-Feb-03 18h11.6134.182.781.836.440.0087


The following are future Oppositions.

Link to chartOpposition
233 Asterope2018-Jun-23 22h11.58-13.662.571.563.840.0094
423 Diotima2018-Jun-26 08h11.31-30.682.951.942.510.0087
578 Happelia2018-Jun-30 03h11.98-33.672.221.224.760.0085
702 Alauda2018-Jul-06 11h11.52-25.813.
198 Ampella2018-Jul-07 07h10.62-17.612.181.162.330.0110
144 Vibilia2018-Jul-07 10h10.88-26.522.461.451.620.0098
26 Proserpina2018-Jul-07 13h10.44-27.742.471.462.130.0092
119 Althaea2018-Jul-10 07h11.75-12.802.551.543.770.0094
137 Meliboea2018-Jul-13 03h11.530.272.481.518.960.0078
88 Thisbe2018-Jul-20 10h9.67-17.442.331.311.430.0089
52 Europa2018-Jul-20 10h11.01-18.643.432.410.610.0082
14 Irene2018-Jul-24 01h9.95-28.082.721.713.090.0098
140 Siwa2018-Jul-24 13h10.39-21.302.141.130.700.0085
55 Pandora2018-Jul-25 22h11.16-30.142.591.594.230.0090
204 Kallisto2018-Aug-03 21h11.82-3.912.331.336.040.0091
70 Panopaea2018-Aug-10 17h10.78-35.852.151.179.940.0086
47 Aglaja2018-Aug-10 23h10.97-21.062.501.492.380.0087
498 Tokio2018-Aug-10 23h11.18-26.872.081.085.820.0095
196 Philomela2018-Aug-11 17h10.88-24.613.
258 Tyche2018-Aug-12 01h11.
409 Aspasia2018-Aug-15 03h11.063.112.551.567.130.0094
269 Justitia2018-Aug-22 02h11.93-10.602.201.190.640.0097
148 Gallia2018-Aug-23 11h10.67-15.172.491.481.600.0134
230 Athamantis2018-Aug-26 13h10.
37 Fides2018-Aug-30 05h10.48-11.512.581.581.000.0097
41 Daphne2018-Sep-01 21h11.09-0.652.871.872.820.0104
115 Thyra2018-Sep-02 13h9.852.672.121.125.400.0115
28 Bellona2018-Sep-03 23h11.34-
431 Nephele2018-Sep-04 19h11.95-9.032.601.600.810.0082
27 Euterpe2018-Sep-06 00h9.79-8.972.401.391.060.0107
5 Astraea2018-Sep-18 22h10.82-5.932.931.931.560.0098
10 Hygiea2018-Sep-24 01h10.065.183.312.311.610.0082

1 The speed column shows apparent speed across the sky at opposition. This should assist photographers to determine how frequently to take frames to obtain a trail (knowing pixels per degree in their telescope/camera configuration).

next to a chart provides a link to a red-on-black version, for display while observing.


Section Director
Steve Harvey

Section Director, Steve Harvey

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