| Parameter |
Value |
| Designation |
C/2025 M3 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2026-07-05T05:58:02.746560Z |
| Orbit solution date (soln_date, UTC) |
2025-09-09T12:42:48Z |
| Obs used |
24 |
| NEO |
- |
| M1 |
8.700 |
| K1 |
10.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2025-06-30T08:56:42.921600Z |
| Discovery magnitude (MPC) |
21.35 w |
| Discovery observatory (MPC) |
F51 · Pan-STARRS 1, Haleakala |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2025-07-02.0000000 |
| e |
1.01973837 |
| q (au) |
6.531641 |
| a (au) |
-330.910866 |
| i (deg) |
137.428013 |
| Ω (om, deg) |
65.265251 |
| ω (w, deg) |
195.386049 |
| M (ma, deg) |
-0.060295 |
Magnitude
Scatter + Global Linear
$$
M_a = (3.530 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
3.530 |
| n |
6.000 |
| gf |
0.989 |
| gb |
-0.654 |
| 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) |
| 2026-06-01 00:00 |
15:12:49.23 |
-28:11:02.4 |
HIP 74245 |
36.78 |
| 2026-06-01 12:00 |
15:12:15.59 |
-28:10:43.6 |
HIP 74245 |
30.58 |
| 2026-06-02 00:00 |
15:11:42.06 |
-28:10:24.1 |
HIP 74245 |
25.06 |
| 2026-06-02 12:00 |
15:11:08.62 |
-28:10:03.9 |
HIP 74245 |
20.76 |
| 2026-06-03 00:00 |
15:10:35.30 |
-28:09:43.0 |
HIP 74245 |
18.52 |
| 2026-06-03 12:00 |
15:10:02.08 |
-28:09:21.5 |
HIP 74149 |
17.71 |
| 2026-06-04 00:00 |
15:09:28.97 |
-28:08:59.3 |
HIP 74149 |
13.85 |
| 2026-06-04 12:00 |
15:08:55.98 |
-28:08:36.5 |
HIP 74149 |
13.29 |
| 2026-06-05 00:00 |
15:08:23.10 |
-28:08:13.0 |
HIP 74149 |
16.34 |
| 2026-06-05 12:00 |
15:07:50.35 |
-28:07:48.9 |
HIP 74149 |
21.50 |
| 2026-06-06 00:00 |
15:07:17.71 |
-28:07:24.3 |
HIP 73889 |
18.57 |
| 2026-06-06 12:00 |
15:06:45.21 |
-28:06:59.0 |
HIP 73889 |
13.46 |
| 2026-06-07 00:00 |
15:06:12.83 |
-28:06:33.2 |
HIP 73889 |
10.97 |
| 2026-06-07 12:00 |
15:05:40.58 |
-28:06:06.8 |
HIP 73889 |
12.71 |
| 2026-06-08 00:00 |
15:05:08.46 |
-28:05:39.9 |
HIP 73754 |
14.60 |
| 2026-06-08 12:00 |
15:04:36.48 |
-28:05:12.4 |
HIP 73710 |
7.77 |
| 2026-06-09 00:00 |
15:04:04.64 |
-28:04:44.4 |
HIP 73710 |
1.21 |
| 2026-06-09 12:00 |
15:03:32.94 |
-28:04:16.0 |
HIP 73710 |
6.43 |
| 2026-06-10 00:00 |
15:03:01.38 |
-28:03:47.0 |
HIP 73566 |
12.14 |
| 2026-06-10 12:00 |
15:02:29.97 |
-28:03:17.6 |
HIP 73566 |
5.22 |
| 2026-06-11 00:00 |
15:01:58.71 |
-28:02:47.7 |
HIP 73566 |
1.89 |
| 2026-06-11 12:00 |
15:01:27.60 |
-28:02:17.3 |
HIP 73566 |
8.66 |
| 2026-06-12 00:00 |
15:00:56.64 |
-28:01:46.6 |
HIP 73566 |
15.50 |
| 2026-06-12 12:00 |
15:00:25.84 |
-28:01:15.4 |
HIP 73566 |
22.31 |
| 2026-06-13 00:00 |
14:59:55.20 |
-28:00:43.9 |
HIP 73386 |
26.94 |
| 2026-06-13 12:00 |
14:59:24.71 |
-28:00:11.9 |
HIP 73284 |
23.06 |
| 2026-06-14 00:00 |
14:58:54.39 |
-27:59:39.6 |
HIP 73284 |
20.50 |
| 2026-06-14 12:00 |
14:58:24.24 |
-27:59:07.0 |
HIP 73284 |
19.96 |
| 2026-06-15 00:00 |
14:57:54.25 |
-27:58:34.0 |
HIP 73284 |
21.57 |
| 2026-06-15 12:00 |
14:57:24.43 |
-27:58:00.7 |
HIP 73284 |
24.88 |
| 2026-06-16 00:00 |
14:56:54.78 |
-27:57:27.1 |
HIP 73284 |
29.30 |
| 2026-06-16 12:00 |
14:56:25.30 |
-27:56:53.2 |
HIP 72962 |
26.55 |
| 2026-06-17 00:00 |
14:55:56.00 |
-27:56:19.1 |
HIP 72962 |
21.50 |
| 2026-06-17 12:00 |
14:55:26.88 |
-27:55:44.7 |
HIP 72962 |
17.46 |
| 2026-06-18 00:00 |
14:54:57.94 |
-27:55:10.1 |
HIP 72962 |
15.21 |
| 2026-06-18 12:00 |
14:54:29.17 |
-27:54:35.2 |
HIP 72962 |
15.48 |
| 2026-06-19 00:00 |
14:54:00.59 |
-27:54:00.1 |
HIP 72962 |
18.13 |
| 2026-06-19 12:00 |
14:53:32.20 |
-27:53:24.9 |
HIP 72962 |
22.29 |
| 2026-06-20 00:00 |
14:53:03.98 |
-27:52:49.5 |
HIP 72704 |
23.09 |
| 2026-06-20 12:00 |
14:52:35.96 |
-27:52:13.9 |
HIP 72704 |
18.95 |
| 2026-06-21 00:00 |
14:52:08.12 |
-27:51:38.2 |
HIP 72704 |
16.22 |
| 2026-06-21 12:00 |
14:51:40.48 |
-27:51:02.3 |
HIP 72704 |
15.60 |
| 2026-06-22 00:00 |
14:51:13.02 |
-27:50:26.3 |
HIP 72571 |
14.22 |