| Parameter |
Value |
| Designation |
C/2025 M2 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2027-11-23T11:43:21.190080Z |
| Orbit solution date (soln_date, UTC) |
2026-07-28T14:12:17Z |
| Obs used |
475 |
| NEO |
- |
| M1 |
6.500 |
| 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) |
2026-02-16.0000000 |
| e |
1.00195085 |
| q (au) |
2.720817 |
| a (au) |
-1394.682982 |
| i (deg) |
173.215169 |
| Ω (om, deg) |
305.534215 |
| ω (w, deg) |
96.755686 |
| M (ma, deg) |
-0.012215 |
Magnitude
Scatter + Global Linear
$$
M_a = (2.490 + 5.425\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
2.490 |
| n |
5.425 |
| gf |
0.852 |
| gb |
-0.959 |
| k |
1.000 |
| δ90 |
7.141 |
| 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) |
| 2026-07-29 00:00 |
19:52:33.76 |
-19:48:54.8 |
HIP 97937 |
30.52 |
| 2026-07-29 12:00 |
19:51:53.53 |
-19:50:22.7 |
HIP 97727 |
37.94 |
| 2026-07-30 00:00 |
19:51:13.30 |
-19:51:50.1 |
HIP 97727 |
39.52 |
| 2026-07-30 12:00 |
19:50:33.05 |
-19:53:16.9 |
HIP 97727 |
43.22 |
| 2026-07-31 00:00 |
19:49:52.81 |
-19:54:43.2 |
HIP 97348 |
39.08 |
| 2026-07-31 12:00 |
19:49:12.57 |
-19:56:08.9 |
HIP 97348 |
29.75 |
| 2026-08-01 00:00 |
19:48:32.34 |
-19:57:34.1 |
HIP 97348 |
20.66 |
| 2026-08-01 12:00 |
19:47:52.11 |
-19:58:58.6 |
HIP 97348 |
12.30 |
| 2026-08-02 00:00 |
19:47:11.91 |
-20:00:22.6 |
HIP 97348 |
7.64 |
| 2026-08-02 12:00 |
19:46:31.73 |
-20:01:46.0 |
HIP 97348 |
12.15 |
| 2026-08-03 00:00 |
19:45:51.57 |
-20:03:08.8 |
HIP 97290 |
18.88 |
| 2026-08-03 12:00 |
19:45:11.44 |
-20:04:31.0 |
HIP 97290 |
25.09 |
| 2026-08-04 00:00 |
19:44:31.35 |
-20:05:52.5 |
HIP 96983 |
25.00 |
| 2026-08-04 12:00 |
19:43:51.29 |
-20:07:13.4 |
HIP 96983 |
15.57 |
| 2026-08-05 00:00 |
19:43:11.28 |
-20:08:33.7 |
HIP 96983 |
6.37 |
| 2026-08-05 12:00 |
19:42:31.32 |
-20:09:53.3 |
HIP 96983 |
4.29 |
| 2026-08-06 00:00 |
19:41:51.41 |
-20:11:12.3 |
HIP 96873 |
8.13 |
| 2026-08-06 12:00 |
19:41:11.55 |
-20:12:30.6 |
HIP 96873 |
8.40 |
| 2026-08-07 00:00 |
19:40:31.76 |
-20:13:48.2 |
HIP 96873 |
15.90 |
| 2026-08-07 12:00 |
19:39:52.03 |
-20:15:05.1 |
HIP 96763 |
18.27 |
| 2026-08-08 00:00 |
19:39:12.38 |
-20:16:21.4 |
HIP 96763 |
21.31 |
| 2026-08-08 12:00 |
19:38:32.79 |
-20:17:37.0 |
HIP 96763 |
27.39 |
| 2026-08-09 00:00 |
19:37:53.29 |
-20:18:51.8 |
HIP 96424 |
27.81 |
| 2026-08-09 12:00 |
19:37:13.87 |
-20:20:06.0 |
HIP 96424 |
21.54 |
| 2026-08-10 00:00 |
19:36:34.54 |
-20:21:19.5 |
HIP 96424 |
18.12 |
| 2026-08-10 12:00 |
19:35:55.30 |
-20:22:32.2 |
HIP 96424 |
19.11 |
| 2026-08-11 00:00 |
19:35:16.15 |
-20:23:44.2 |
HIP 96370 |
23.61 |
| 2026-08-11 12:00 |
19:34:37.11 |
-20:24:55.5 |
HIP 96370 |
25.91 |
| 2026-08-12 00:00 |
19:33:58.17 |
-20:26:06.0 |
HIP 96086 |
26.17 |
| 2026-08-12 12:00 |
19:33:19.35 |
-20:27:15.9 |
HIP 96086 |
17.30 |
| 2026-08-13 00:00 |
19:32:40.64 |
-20:28:24.9 |
HIP 96086 |
9.06 |
| 2026-08-13 12:00 |
19:32:02.04 |
-20:29:33.2 |
HIP 96086 |
5.65 |
| 2026-08-14 00:00 |
19:31:23.57 |
-20:30:40.8 |
HIP 96086 |
12.12 |
| 2026-08-14 12:00 |
19:30:45.23 |
-20:31:47.6 |
HIP 95912 |
19.22 |
| 2026-08-15 00:00 |
19:30:07.02 |
-20:32:53.7 |
HIP 95912 |
17.42 |
| 2026-08-15 12:00 |
19:29:28.94 |
-20:33:59.0 |
HIP 95912 |
19.97 |
| 2026-08-16 00:00 |
19:28:51.00 |
-20:35:03.5 |
HIP 95668 |
22.23 |
| 2026-08-16 12:00 |
19:28:13.21 |
-20:36:07.3 |
HIP 95668 |
16.91 |
| 2026-08-17 00:00 |
19:27:35.56 |
-20:37:10.3 |
HIP 95668 |
15.37 |
| 2026-08-17 12:00 |
19:26:58.06 |
-20:38:12.5 |
HIP 95668 |
18.53 |
| 2026-08-18 00:00 |
19:26:20.71 |
-20:39:14.0 |
HIP 95668 |
24.59 |
| 2026-08-18 12:00 |
19:25:43.52 |
-20:40:14.7 |
HIP 95668 |
31.92 |
| 2026-08-19 00:00 |
19:25:06.50 |
-20:41:14.6 |
HIP 95244 |
34.30 |