C/2021 QM45 (PANSTARRS)
| 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 |
-0.998 |
| 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) |
| 2026-02-03 00:00 |
12:29:43.74 |
-08:35:26.0 |
HIP 60816 |
27.23 |
| 2026-02-03 12:00 |
12:29:38.89 |
-08:35:24.2 |
HIP 60816 |
26.06 |
| 2026-02-04 00:00 |
12:29:33.96 |
-08:35:21.7 |
HIP 60816 |
24.88 |
| 2026-02-04 12:00 |
12:29:28.95 |
-08:35:18.7 |
HIP 60816 |
23.68 |
| 2026-02-05 00:00 |
12:29:23.86 |
-08:35:15.0 |
HIP 60816 |
22.47 |
| 2026-02-05 12:00 |
12:29:18.70 |
-08:35:10.9 |
HIP 60816 |
21.25 |
| 2026-02-06 00:00 |
12:29:13.45 |
-08:35:06.1 |
HIP 60816 |
20.03 |
| 2026-02-06 12:00 |
12:29:08.13 |
-08:35:00.8 |
HIP 60816 |
18.79 |
| 2026-02-07 00:00 |
12:29:02.72 |
-08:34:54.9 |
HIP 60816 |
17.56 |
| 2026-02-07 12:00 |
12:28:57.24 |
-08:34:48.4 |
HIP 60816 |
16.32 |
| 2026-02-08 00:00 |
12:28:51.69 |
-08:34:41.4 |
HIP 60816 |
15.09 |
| 2026-02-08 12:00 |
12:28:46.05 |
-08:34:33.7 |
HIP 60816 |
13.88 |
| 2026-02-09 00:00 |
12:28:40.35 |
-08:34:25.6 |
HIP 60816 |
12.70 |
| 2026-02-09 12:00 |
12:28:34.56 |
-08:34:16.9 |
HIP 60816 |
11.55 |
| 2026-02-10 00:00 |
12:28:28.71 |
-08:34:07.6 |
HIP 60816 |
10.48 |
| 2026-02-10 12:00 |
12:28:22.77 |
-08:33:57.7 |
HIP 60816 |
9.49 |
| 2026-02-11 00:00 |
12:28:16.77 |
-08:33:47.3 |
HIP 60816 |
8.64 |
| 2026-02-11 12:00 |
12:28:10.69 |
-08:33:36.3 |
HIP 60816 |
7.99 |
| 2026-02-12 00:00 |
12:28:04.54 |
-08:33:24.8 |
HIP 60816 |
7.59 |
| 2026-02-12 12:00 |
12:27:58.32 |
-08:33:12.8 |
HIP 60816 |
7.49 |
| 2026-02-13 00:00 |
12:27:52.02 |
-08:33:00.1 |
HIP 60816 |
7.72 |
| 2026-02-13 12:00 |
12:27:45.66 |
-08:32:47.0 |
HIP 60816 |
8.27 |
| 2026-02-14 00:00 |
12:27:39.23 |
-08:32:33.3 |
HIP 60816 |
9.07 |
| 2026-02-14 12:00 |
12:27:32.72 |
-08:32:19.0 |
HIP 60816 |
10.09 |
| 2026-02-15 00:00 |
12:27:26.15 |
-08:32:04.3 |
HIP 60816 |
11.27 |
| 2026-02-15 12:00 |
12:27:19.52 |
-08:31:49.0 |
HIP 60816 |
12.58 |
| 2026-02-16 00:00 |
12:27:12.81 |
-08:31:33.1 |
HIP 60816 |
13.97 |
| 2026-02-16 12:00 |
12:27:06.04 |
-08:31:16.7 |
HIP 60816 |
15.44 |
| 2026-02-17 00:00 |
12:26:59.20 |
-08:30:59.8 |
HIP 60816 |
16.97 |
| 2026-02-17 12:00 |
12:26:52.30 |
-08:30:42.4 |
HIP 60816 |
18.56 |
| 2026-02-18 00:00 |
12:26:45.34 |
-08:30:24.5 |
HIP 60745 |
19.66 |
| 2026-02-18 12:00 |
12:26:38.31 |
-08:30:06.0 |
HIP 60745 |
20.33 |
| 2026-02-19 00:00 |
12:26:31.22 |
-08:29:47.0 |
HIP 60745 |
21.13 |
| 2026-02-19 12:00 |
12:26:24.07 |
-08:29:27.6 |
HIP 60745 |
22.07 |
| 2026-02-20 00:00 |
12:26:16.86 |
-08:29:07.6 |
HIP 60745 |
23.12 |
| 2026-02-20 12:00 |
12:26:09.59 |
-08:28:47.1 |
HIP 60745 |
24.28 |
| 2026-02-21 00:00 |
12:26:02.26 |
-08:28:26.1 |
HIP 60745 |
25.53 |
| 2026-02-21 12:00 |
12:25:54.87 |
-08:28:04.6 |
HIP 60745 |
26.86 |
| 2026-02-22 00:00 |
12:25:47.43 |
-08:27:42.7 |
HIP 60745 |
28.27 |
| 2026-02-22 12:00 |
12:25:39.93 |
-08:27:20.2 |
HIP 60479 |
26.43 |
| 2026-02-23 00:00 |
12:25:32.37 |
-08:26:57.3 |
HIP 60479 |
24.52 |
| 2026-02-23 12:00 |
12:25:24.76 |
-08:26:33.9 |
HIP 60479 |
22.60 |
| 2026-02-24 00:00 |
12:25:17.10 |
-08:26:10.0 |
HIP 60479 |
20.66 |