| Parameter |
Value |
| Designation |
C/2021 QM45 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2022-08-13T10:26:49.989120Z |
| Orbit solution date (soln_date, UTC) |
2023-03-20T19:42:38Z |
| Obs used |
382 |
| NEO |
- |
| M1 |
9.100 |
| K1 |
15.250 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2022-08-10.0000000 |
| e |
0.99216612 |
| q (au) |
2.773251 |
| a (au) |
354.007155 |
| i (deg) |
22.822373 |
| Ω (om, deg) |
354.588581 |
| ω (w, deg) |
72.804814 |
| M (ma, deg) |
359.999492 |
Magnitude
Scatter + Global Linear
$$
M_a = (7.914 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
7.914 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.501 |
| k |
1.000 |
| 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) |
| 2026-09-20 00:00 |
12:22:30.88 |
-08:41:39.4 |
HIP 60315 |
10.52 |
| 2026-09-20 12:00 |
12:22:40.39 |
-08:42:48.9 |
HIP 60315 |
12.94 |
| 2026-09-21 00:00 |
12:22:49.90 |
-08:43:58.5 |
HIP 60315 |
15.43 |
| 2026-09-21 12:00 |
12:22:59.41 |
-08:45:08.2 |
HIP 60315 |
17.95 |
| 2026-09-22 00:00 |
12:23:08.93 |
-08:46:18.0 |
HIP 60315 |
20.51 |
| 2026-09-22 12:00 |
12:23:18.45 |
-08:47:28.0 |
HIP 60315 |
23.08 |
| 2026-09-23 00:00 |
12:23:27.98 |
-08:48:38.1 |
HIP 60315 |
25.66 |
| 2026-09-23 12:00 |
12:23:37.51 |
-08:49:48.3 |
HIP 60479 |
28.02 |
| 2026-09-24 00:00 |
12:23:47.04 |
-08:50:58.6 |
HIP 60479 |
28.92 |
| 2026-09-24 12:00 |
12:23:56.57 |
-08:52:09.0 |
HIP 60479 |
30.03 |
| 2026-09-25 00:00 |
12:24:06.11 |
-08:53:19.6 |
HIP 60479 |
31.32 |
| 2026-09-25 12:00 |
12:24:15.65 |
-08:54:30.2 |
HIP 60479 |
32.77 |
| 2026-09-26 00:00 |
12:24:25.18 |
-08:55:40.9 |
HIP 60479 |
34.37 |
| 2026-09-26 12:00 |
12:24:34.72 |
-08:56:51.8 |
HIP 60479 |
36.09 |
| 2026-09-27 00:00 |
12:24:44.26 |
-08:58:02.7 |
HIP 60745 |
34.27 |
| 2026-09-27 12:00 |
12:24:53.80 |
-08:59:13.7 |
HIP 60745 |
32.31 |
| 2026-09-28 00:00 |
12:25:03.34 |
-09:00:24.9 |
HIP 60745 |
30.46 |
| 2026-09-28 12:00 |
12:25:12.87 |
-09:01:36.1 |
HIP 60745 |
28.73 |
| 2026-09-29 00:00 |
12:25:22.41 |
-09:02:47.4 |
HIP 60745 |
27.15 |
| 2026-09-29 12:00 |
12:25:31.94 |
-09:03:58.8 |
HIP 60745 |
25.75 |
| 2026-09-30 00:00 |
12:25:41.47 |
-09:05:10.2 |
HIP 60745 |
24.55 |
| 2026-09-30 12:00 |
12:25:51.00 |
-09:06:21.8 |
HIP 60745 |
23.59 |
| 2026-10-01 00:00 |
12:26:00.52 |
-09:07:33.4 |
HIP 60745 |
22.89 |
| 2026-10-01 12:00 |
12:26:10.04 |
-09:08:45.1 |
HIP 60745 |
22.49 |
| 2026-10-02 00:00 |
12:26:19.56 |
-09:09:56.9 |
HIP 60745 |
22.39 |
| 2026-10-02 12:00 |
12:26:29.07 |
-09:11:08.8 |
HIP 60745 |
22.60 |
| 2026-10-03 00:00 |
12:26:38.57 |
-09:12:20.7 |
HIP 60745 |
23.12 |
| 2026-10-03 12:00 |
12:26:48.07 |
-09:13:32.7 |
HIP 60745 |
23.92 |
| 2026-10-04 00:00 |
12:26:57.57 |
-09:14:44.7 |
HIP 60745 |
24.97 |
| 2026-10-04 12:00 |
12:27:07.06 |
-09:15:56.8 |
HIP 60745 |
26.25 |
| 2026-10-05 00:00 |
12:27:16.54 |
-09:17:09.0 |
HIP 60745 |
27.72 |
| 2026-10-05 12:00 |
12:27:26.02 |
-09:18:21.2 |
HIP 60745 |
29.35 |
| 2026-10-06 00:00 |
12:27:35.48 |
-09:19:33.5 |
HIP 60745 |
31.12 |
| 2026-10-06 12:00 |
12:27:44.94 |
-09:20:45.8 |
HIP 60745 |
33.00 |
| 2026-10-07 00:00 |
12:27:54.39 |
-09:21:58.1 |
HIP 60745 |
34.98 |
| 2026-10-07 12:00 |
12:28:03.83 |
-09:23:10.5 |
HIP 60745 |
37.04 |
| 2026-10-08 00:00 |
12:28:13.26 |
-09:24:23.0 |
HIP 60745 |
39.17 |
| 2026-10-08 12:00 |
12:28:22.68 |
-09:25:35.5 |
HIP 61042 |
41.13 |
| 2026-10-09 00:00 |
12:28:32.09 |
-09:26:48.0 |
HIP 61042 |
38.54 |
| 2026-10-09 12:00 |
12:28:41.49 |
-09:28:00.5 |
HIP 61042 |
35.96 |
| 2026-10-10 00:00 |
12:28:50.88 |
-09:29:13.1 |
HIP 61042 |
33.38 |
| 2026-10-10 12:00 |
12:29:00.25 |
-09:30:25.7 |
HIP 61042 |
30.81 |
| 2026-10-11 00:00 |
12:29:09.62 |
-09:31:38.3 |
HIP 61042 |
28.25 |