| Parameter |
Value |
| Designation |
C/2025 M2 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2027-11-23T10:31:18.693120Z |
| Orbit solution date (soln_date, UTC) |
2026-05-28T12:12:16Z |
| Obs used |
287 |
| NEO |
- |
| M1 |
6.600 |
| K1 |
9.750 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2025-06-22T12:55:09.638400Z |
| Discovery magnitude (MPC) |
20.66 w |
| Discovery observatory (MPC) |
F52 · Pan-STARRS 2, Haleakala |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2025-11-23.0000000 |
| e |
1.00202872 |
| q (au) |
2.720494 |
| a (au) |
-1340.991818 |
| i (deg) |
173.214961 |
| Ω (om, deg) |
305.534372 |
| ω (w, deg) |
96.758340 |
| M (ma, deg) |
-0.014660 |
Magnitude
Scatter + Global Linear
$$
M_a = (2.368 + 5.528\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
2.368 |
| n |
5.528 |
| gf |
0.904 |
| gb |
-0.967 |
| k |
1.000 |
| δ90 |
4.184 |
| 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
Finding Chart
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-06-01 00:00 |
20:53:45.97 |
-17:02:06.3 |
HIP 103039 |
17.77 |
| 2026-06-01 12:00 |
20:53:27.34 |
-17:03:03.0 |
HIP 103039 |
13.72 |
| 2026-06-02 00:00 |
20:53:08.45 |
-17:04:00.5 |
HIP 103039 |
10.07 |
| 2026-06-02 12:00 |
20:52:49.32 |
-17:04:58.9 |
HIP 103039 |
7.55 |
| 2026-06-03 00:00 |
20:52:29.94 |
-17:05:58.1 |
HIP 103039 |
7.52 |
| 2026-06-03 12:00 |
20:52:10.30 |
-17:06:58.0 |
HIP 103039 |
10.09 |
| 2026-06-04 00:00 |
20:51:50.41 |
-17:07:58.8 |
HIP 103039 |
13.95 |
| 2026-06-04 12:00 |
20:51:30.27 |
-17:09:00.4 |
HIP 102913 |
11.58 |
| 2026-06-05 00:00 |
20:51:09.88 |
-17:10:02.8 |
HIP 102913 |
8.02 |
| 2026-06-05 12:00 |
20:50:49.24 |
-17:11:06.1 |
HIP 102913 |
6.64 |
| 2026-06-06 00:00 |
20:50:28.33 |
-17:12:10.1 |
HIP 102913 |
8.69 |
| 2026-06-06 12:00 |
20:50:07.18 |
-17:13:14.9 |
HIP 102913 |
12.66 |
| 2026-06-07 00:00 |
20:49:45.77 |
-17:14:20.4 |
HIP 102913 |
17.33 |
| 2026-06-07 12:00 |
20:49:24.11 |
-17:15:26.8 |
HIP 102913 |
22.31 |
| 2026-06-08 00:00 |
20:49:02.19 |
-17:16:34.0 |
HIP 102913 |
27.46 |
| 2026-06-08 12:00 |
20:48:40.01 |
-17:17:41.9 |
HIP 102521 |
31.05 |
| 2026-06-09 00:00 |
20:48:17.58 |
-17:18:50.6 |
HIP 102521 |
26.28 |
| 2026-06-09 12:00 |
20:47:54.89 |
-17:20:00.1 |
HIP 102521 |
21.79 |
| 2026-06-10 00:00 |
20:47:31.95 |
-17:21:10.3 |
HIP 102521 |
17.87 |
| 2026-06-10 12:00 |
20:47:08.75 |
-17:22:21.3 |
HIP 102521 |
15.04 |
| 2026-06-11 00:00 |
20:46:45.30 |
-17:23:33.1 |
HIP 102521 |
14.03 |
| 2026-06-11 12:00 |
20:46:21.58 |
-17:24:45.5 |
HIP 102521 |
15.30 |
| 2026-06-12 00:00 |
20:45:57.62 |
-17:25:58.8 |
HIP 102521 |
18.43 |
| 2026-06-12 12:00 |
20:45:33.39 |
-17:27:12.7 |
HIP 102521 |
22.71 |
| 2026-06-13 00:00 |
20:45:08.91 |
-17:28:27.4 |
HIP 102521 |
27.65 |
| 2026-06-13 12:00 |
20:44:44.17 |
-17:29:42.8 |
HIP 102521 |
33.00 |
| 2026-06-14 00:00 |
20:44:19.18 |
-17:30:58.9 |
HIP 102521 |
38.60 |
| 2026-06-14 12:00 |
20:43:53.94 |
-17:32:15.8 |
HIP 102178 |
36.59 |
| 2026-06-15 00:00 |
20:43:28.44 |
-17:33:33.3 |
HIP 102085 |
32.68 |
| 2026-06-15 12:00 |
20:43:02.68 |
-17:34:51.5 |
HIP 102085 |
27.52 |
| 2026-06-16 00:00 |
20:42:36.67 |
-17:36:10.4 |
HIP 102085 |
22.87 |
| 2026-06-16 12:00 |
20:42:10.41 |
-17:37:29.9 |
HIP 102085 |
19.19 |
| 2026-06-17 00:00 |
20:41:43.90 |
-17:38:50.1 |
HIP 102060 |
14.03 |
| 2026-06-17 12:00 |
20:41:17.13 |
-17:40:11.0 |
HIP 102060 |
8.78 |
| 2026-06-18 00:00 |
20:40:50.12 |
-17:41:32.5 |
HIP 102060 |
6.50 |
| 2026-06-18 12:00 |
20:40:22.85 |
-17:42:54.7 |
HIP 102060 |
9.74 |
| 2026-06-19 00:00 |
20:39:55.34 |
-17:44:17.4 |
HIP 102060 |
15.39 |
| 2026-06-19 12:00 |
20:39:27.58 |
-17:45:40.8 |
HIP 102060 |
21.71 |
| 2026-06-20 00:00 |
20:38:59.57 |
-17:47:04.7 |
HIP 101984 |
26.04 |
| 2026-06-20 12:00 |
20:38:31.31 |
-17:48:29.3 |
HIP 101984 |
29.46 |
| 2026-06-21 00:00 |
20:38:02.81 |
-17:49:54.4 |
HIP 101984 |
33.99 |
| 2026-06-21 12:00 |
20:37:34.07 |
-17:51:20.1 |
HIP 101596 |
31.14 |
| 2026-06-22 00:00 |
20:37:05.08 |
-17:52:46.4 |
HIP 101596 |
24.60 |