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.

Historical

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

Link to chartOpposition
(UT)
MagDec
(°)
r
(AU)
Δ
(AU)
Phase
(°)
Speed1
(°/hr)
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

Current

The following are future Oppositions.

Link to chartOpposition
(UT)
MagDec
(°)
r
(AU)
Δ
(AU)
Phase
(°)
Speed1
(°/hr)
93 Minerva2021-Mar-08 03h11.758.402.841.851.310.0098
116 Sirona2021-Mar-10 11h10.729.422.381.392.440.0093
409 Aspasia2021-Mar-11 11h11.00-12.562.481.526.950.0098
35 Leukothea2021-Mar-29 22h11.34-7.012.341.341.570.0092
9 Metis2021-Apr-04 13h9.511.182.501.503.000.0106
192 Nausikaa2021-Apr-07 12h11.44-12.252.991.991.930.0103
174 Phaedra2021-Apr-14 23h11.91-25.042.571.606.390.0092
511 Davida2021-Apr-15 06h11.4611.023.362.416.480.0081
28 Bellona2021-Apr-24 03h10.960.472.681.695.230.0092
69 Hesperia2021-Apr-24 14h11.30-6.942.981.982.140.0089
346 Hermentaria2021-Apr-25 11h11.70-2.963.072.083.530.0090
480 Hansa2021-Apr-30 10h11.99-24.672.711.713.850.0114
120 Lachesis2021-May-01 16h11.90-23.842.951.953.100.0083
389 Industria2021-May-10 07h11.05-28.092.471.474.430.0096
37 Fides2021-May-11 02h11.55-20.833.062.051.020.0093
324 Bamberga2021-May-18 13h11.60-35.473.112.135.240.0095
230 Athamantis2021-May-22 05h10.24-20.042.481.470.130.0108
704 Interamnia2021-May-24 06h11.26-35.703.332.354.580.0087
128 Nemesis2021-May-26 18h11.65-19.432.971.950.610.0092
172 Baucis2021-May-28 05h11.76-38.682.321.337.540.0100
216 Kleopatra2021-May-29 10h11.88-11.463.312.303.130.0091
101 Helena2021-Jun-02 04h11.57-39.112.471.486.940.0094
3 Juno2021-Jun-06 22h10.12-4.203.292.315.630.0089
5 Astraea2021-Jun-20 06h10.78-16.752.811.802.400.0097

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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