| Parameter |
Value |
| Designation |
P/2010 J3 (McMillan) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2010-08-23T11:07:54.177600Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:44Z |
| Obs used |
524 |
| NEO |
- |
| M1 |
11.400 |
| K1 |
11.500 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2010-06-09.0000000 |
| e |
0.72682274 |
| q (au) |
2.455111 |
| a (au) |
8.987243 |
| i (deg) |
13.255078 |
| Ω (om, deg) |
106.661189 |
| ω (w, deg) |
157.312459 |
| M (ma, deg) |
357.239402 |
Magnitude
Scatter + Global Linear
$$
M_a = (12.620 + 4.528\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
12.620 |
| n |
4.528 |
| gf |
1.000 |
| gb |
-0.528 |
| k |
0.800 |
| δ90 |
10.000 |
| Parameter |
Symbol |
Range |
Description |
| Absolute magnitude at 1 AU from Sun and Earth |
H0 |
-5 to 20 |
Intrinsic brightness of the comet |
| Photometric slope parameter |
n |
2 to 6 |
Rate of brightness change with heliocentric distance |
| Forward scattering asymmetry factor |
gf |
0.8 to 1 |
Degree of forward scattering |
| Backward scattering asymmetry factor |
gb |
-1 to -0.5 |
Degree of backward scattering |
| Partitioning coefficient |
k |
0.8 to 1 |
Ratio between forward/backward scattering contributions |
| Dust-to-gas brightness ratio |
δ90 |
1 to 10 |
Relative contribution of dust scattering to gas emission |
Reference: EPSC-DPS2025-160
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-06-01 00:00 |
06:01:36.30 |
+20:11:47.8 |
HIP 28425 |
23.77 |
| 2026-06-01 12:00 |
06:01:44.55 |
+20:11:52.9 |
HIP 28425 |
25.49 |
| 2026-06-02 00:00 |
06:01:52.82 |
+20:11:58.0 |
HIP 28495 |
26.87 |
| 2026-06-02 12:00 |
06:02:01.12 |
+20:12:03.0 |
HIP 28716 |
27.03 |
| 2026-06-03 00:00 |
06:02:09.43 |
+20:12:07.9 |
HIP 28716 |
25.11 |
| 2026-06-03 12:00 |
06:02:17.75 |
+20:12:12.7 |
HIP 28716 |
23.19 |
| 2026-06-04 00:00 |
06:02:26.10 |
+20:12:17.4 |
HIP 28716 |
21.28 |
| 2026-06-04 12:00 |
06:02:34.47 |
+20:12:22.1 |
HIP 28716 |
19.37 |
| 2026-06-05 00:00 |
06:02:42.85 |
+20:12:26.7 |
HIP 28716 |
17.47 |
| 2026-06-05 12:00 |
06:02:51.25 |
+20:12:31.2 |
HIP 28716 |
15.58 |
| 2026-06-06 00:00 |
06:02:59.66 |
+20:12:35.7 |
HIP 28716 |
13.72 |
| 2026-06-06 12:00 |
06:03:08.09 |
+20:12:40.1 |
HIP 28716 |
11.88 |
| 2026-06-07 00:00 |
06:03:16.54 |
+20:12:44.3 |
HIP 28716 |
10.09 |
| 2026-06-07 12:00 |
06:03:25.00 |
+20:12:48.6 |
HIP 28716 |
8.39 |
| 2026-06-08 00:00 |
06:03:33.48 |
+20:12:52.7 |
HIP 28716 |
6.84 |
| 2026-06-08 12:00 |
06:03:41.97 |
+20:12:56.8 |
HIP 28716 |
5.58 |
| 2026-06-09 00:00 |
06:03:50.47 |
+20:13:00.7 |
HIP 28716 |
4.83 |
| 2026-06-09 12:00 |
06:03:58.99 |
+20:13:04.6 |
HIP 28716 |
4.85 |
| 2026-06-10 00:00 |
06:04:07.52 |
+20:13:08.5 |
HIP 28716 |
5.63 |
| 2026-06-10 12:00 |
06:04:16.07 |
+20:13:12.2 |
HIP 28716 |
6.93 |
| 2026-06-11 00:00 |
06:04:24.62 |
+20:13:15.9 |
HIP 28716 |
8.50 |
| 2026-06-11 12:00 |
06:04:33.19 |
+20:13:19.5 |
HIP 28716 |
10.23 |
| 2026-06-12 00:00 |
06:04:41.77 |
+20:13:23.0 |
HIP 28716 |
12.05 |
| 2026-06-12 12:00 |
06:04:50.36 |
+20:13:26.4 |
HIP 28716 |
13.93 |
| 2026-06-13 00:00 |
06:04:58.96 |
+20:13:29.8 |
HIP 28716 |
15.84 |
| 2026-06-13 12:00 |
06:05:07.57 |
+20:13:33.0 |
HIP 28716 |
17.78 |
| 2026-06-14 00:00 |
06:05:16.19 |
+20:13:36.2 |
HIP 28716 |
19.73 |
| 2026-06-14 12:00 |
06:05:24.82 |
+20:13:39.3 |
HIP 28958 |
19.59 |
| 2026-06-15 00:00 |
06:05:33.46 |
+20:13:42.4 |
HIP 28958 |
17.75 |
| 2026-06-15 12:00 |
06:05:42.11 |
+20:13:45.3 |
HIP 28958 |
15.95 |
| 2026-06-16 00:00 |
06:05:50.76 |
+20:13:48.2 |
HIP 28958 |
14.21 |
| 2026-06-16 12:00 |
06:05:59.42 |
+20:13:51.0 |
HIP 28958 |
12.56 |
| 2026-06-17 00:00 |
06:06:08.09 |
+20:13:53.7 |
HIP 28958 |
11.03 |
| 2026-06-17 12:00 |
06:06:16.76 |
+20:13:56.3 |
HIP 28958 |
9.69 |
| 2026-06-18 00:00 |
06:06:25.44 |
+20:13:58.9 |
HIP 28958 |
8.63 |
| 2026-06-18 12:00 |
06:06:34.13 |
+20:14:01.4 |
HIP 28958 |
7.95 |
| 2026-06-19 00:00 |
06:06:42.82 |
+20:14:03.8 |
HIP 28958 |
7.76 |
| 2026-06-19 12:00 |
06:06:51.51 |
+20:14:06.1 |
HIP 28958 |
8.09 |
| 2026-06-20 00:00 |
06:07:00.21 |
+20:14:08.4 |
HIP 28958 |
8.90 |
| 2026-06-20 12:00 |
06:07:08.91 |
+20:14:10.5 |
HIP 28958 |
10.06 |
| 2026-06-21 00:00 |
06:07:17.61 |
+20:14:12.6 |
HIP 28958 |
11.46 |
| 2026-06-21 12:00 |
06:07:26.31 |
+20:14:14.6 |
HIP 28958 |
13.04 |
| 2026-06-22 00:00 |
06:07:35.02 |
+20:14:16.5 |
HIP 28958 |
14.73 |