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
110 Lydia2020-Jun-21 13h11.30-28.792.631.622.060.0092
64 Angelina2020-Jun-22 01h11.83-24.682.931.910.430.0092
7 Iris2020-Jun-28 02h8.90-20.642.631.611.010.0106
56 Melete2020-Jun-29 01h10.58-
532 Herculina2020-Jul-02 15h9.44-19.912.741.721.140.0105
111 Ate2020-Jul-05 09h11.96-25.642.851.841.030.0095
185 Eunike2020-Jul-07 18h11.765.042.711.7710.010.0098
385 Ilmatar2020-Jul-10 16h11.89-39.132.951.975.820.0089
335 Roberta2020-Jul-10 20h11.04-15.712.
2 Pallas2020-Jul-13 03h9.6021.333.362.5512.010.0086
129 Antigone2020-Jul-15 19h10.12-13.342.381.373.460.0100
444 Gyptis2020-Jul-21 04h11.22-3.682.421.437.070.0088
336 Lacadiera2020-Jul-22 03h11.91-10.462.061.054.890.0102
126 Velleda2020-Jul-24 03h11.70-24.972.251.242.360.0097
259 Aletheia2020-Jul-30 09h11.78-28.972.861.853.860.0085
44 Nysa2020-Aug-05 18h10.34-16.972.751.740.070.0101
751 Faina2020-Aug-07 12h11.87-37.782.341.379.600.0100
221 Eos2020-Aug-08 00h11.14-14.362.711.700.690.0091
432 Pythia2020-Aug-09 01h11.40-
487 Venetia2020-Aug-14 20h11.66-21.492.581.573.050.0098
106 Dione2020-Aug-15 22h11.53-20.282.931.932.370.0082
165 Loreley2020-Aug-17 05h11.86-7.192.901.892.270.0087
138 Tolosa2020-Aug-22 11h10.78-17.502.
550 Senta2020-Aug-22 17h11.484.582.021.038.500.0088
308 Polyxo2020-Aug-24 12h11.49-7.642.651.651.340.0092
1 Ceres2020-Aug-28 13h7.70-23.792.981.995.160.0089
20 Massalia2020-Aug-28 22h9.62-8.572.581.570.340.0103
17 Thetis2020-Sep-10 00h10.62-10.872.401.402.680.0102
22 Kalliope2020-Sep-10 11h10.61-23.702.811.847.250.0086
19 Fortuna2020-Sep-11 08h9.38-2.612.141.130.930.0098
200 Dynamene2020-Oct-25 02h11.4322.302.391.404.500.0093
471 Papagena2020-Oct-26 06h9.52-
45 Eugenia2020-Oct-31 23h11.705.462.931.953.170.0094
8 Flora2020-Nov-01 07h8.053.171.850.876.330.0103
82 Alkmene2020-Nov-10 15h11.5119.022.611.620.670.0099
386 Siegena2020-Nov-14 18h11.27-11.042.441.5411.800.0090
177 Irma2020-Nov-15 03h11.8620.752.
266 Aline2020-Nov-19 02h11.5119.042.411.420.170.0109
51 Nemausa2020-Nov-26 02h10.765.662.421.456.260.0107
202 Chryseis2020-Dec-01 01h11.669.612.921.954.120.0088
250 Bettina2020-Dec-01 20h11.4036.122.761.795.090.0090
74 Galatea2020-Dec-04 22h11.5616.612.351.372.400.0097
201 Penelope2020-Dec-07 10h11.9813.672.651.673.330.0099
16 Psyche2020-Dec-07 20h9.5218.002.671.691.730.0092
423 Diotima2020-Dec-11 17h11.6526.
79 Eurynome2020-Dec-11 20h9.9415.892.021.043.470.0102
13 Egeria2020-Dec-20 13h10.0443.562.381.438.150.0109
163 Erigone2020-Dec-21 02h11.4014.131.910.934.750.0100
39 Laetitia2020-Dec-21 13h9.858.472.691.735.390.0096
556 Phyllis2020-Dec-22 23h11.9125.842.
52 Europa2020-Dec-29 01h10.1917.212.761.782.130.0090
313 Chaldaea2020-Dec-31 02h11.331.121.991.0410.660.0101
356 Liguria2020-Dec-31 17h10.8937.542.131.166.640.0093
41 Daphne2021-Jan-02 04h11.920.392.992.067.230.0096
345 Tercidina2021-Jan-03 14h11.606.312.181.227.340.0108
103 Hera2021-Jan-03 15h11.4718.312.851.871.540.0097
130 Elektra2021-Jan-04 01h11.49-0.452.871.947.780.0101
245 Vera2021-Jan-04 05h11.6028.112.791.811.900.0090
287 Nephthys2021-Jan-12 15h11.2213.152.391.423.480.0114
679 Pax2021-Jan-13 06h11.8522.152.391.400.280.0147
10 Hygiea2021-Jan-28 18h9.9115.753.202.220.730.0086

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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