| Parameter |
Value |
| Designation |
C/2025 M3 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2026-07-23T06:23:26.626560Z |
| Orbit solution date (soln_date, UTC) |
2026-06-18T16:12:20Z |
| Obs used |
34 |
| NEO |
- |
| M1 |
13.400 |
| K1 |
4.500 |
| 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) |
2025-10-07.0000000 |
| e |
0.99964607 |
| q (au) |
6.471304 |
| a (au) |
18283.904807 |
| i (deg) |
137.223220 |
| Ω (om, deg) |
65.355111 |
| ω (w, deg) |
197.024136 |
| M (ma, deg) |
359.999885 |
Magnitude
Scatter + Global Linear
$$
M_a = (12.286 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
12.286 |
| n |
2.000 |
| gf |
0.811 |
| gb |
-0.973 |
| k |
1.000 |
| δ90 |
4.179 |
| 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 |
14:26:57.12 |
-27:15:45.0 |
HIP 70774 |
20.73 |
| 2026-07-29 12:00 |
14:26:45.29 |
-27:15:34.6 |
HIP 70774 |
23.36 |
| 2026-07-30 00:00 |
14:26:33.67 |
-27:15:24.9 |
HIP 70614 |
24.00 |
| 2026-07-30 12:00 |
14:26:22.24 |
-27:15:15.8 |
HIP 70614 |
24.10 |
| 2026-07-31 00:00 |
14:26:11.00 |
-27:15:07.4 |
HIP 70614 |
24.47 |
| 2026-07-31 12:00 |
14:25:59.97 |
-27:14:59.7 |
HIP 70538 |
24.02 |
| 2026-08-01 00:00 |
14:25:49.12 |
-27:14:52.6 |
HIP 70538 |
23.75 |
| 2026-08-01 12:00 |
14:25:38.48 |
-27:14:46.2 |
HIP 70538 |
23.73 |
| 2026-08-02 00:00 |
14:25:28.02 |
-27:14:40.6 |
HIP 70538 |
23.96 |
| 2026-08-02 12:00 |
14:25:17.76 |
-27:14:35.6 |
HIP 70538 |
24.40 |
| 2026-08-03 00:00 |
14:25:07.69 |
-27:14:31.3 |
HIP 70538 |
25.04 |
| 2026-08-03 12:00 |
14:24:57.81 |
-27:14:27.6 |
HIP 70538 |
25.85 |
| 2026-08-04 00:00 |
14:24:48.12 |
-27:14:24.7 |
HIP 70538 |
26.81 |
| 2026-08-04 12:00 |
14:24:38.62 |
-27:14:22.5 |
HIP 70315 |
27.75 |
| 2026-08-05 00:00 |
14:24:29.31 |
-27:14:21.0 |
HIP 70315 |
26.31 |
| 2026-08-05 12:00 |
14:24:20.18 |
-27:14:20.3 |
HIP 70315 |
24.99 |
| 2026-08-06 00:00 |
14:24:11.24 |
-27:14:20.2 |
HIP 70315 |
23.81 |
| 2026-08-06 12:00 |
14:24:02.49 |
-27:14:20.8 |
HIP 70315 |
22.77 |
| 2026-08-07 00:00 |
14:23:53.93 |
-27:14:22.2 |
HIP 70315 |
21.89 |
| 2026-08-07 12:00 |
14:23:45.55 |
-27:14:24.3 |
HIP 70315 |
21.16 |
| 2026-08-08 00:00 |
14:23:37.35 |
-27:14:27.1 |
HIP 70315 |
20.61 |
| 2026-08-08 12:00 |
14:23:29.34 |
-27:14:30.7 |
HIP 70315 |
20.22 |
| 2026-08-09 00:00 |
14:23:21.51 |
-27:14:35.0 |
HIP 70315 |
20.01 |
| 2026-08-09 12:00 |
14:23:13.86 |
-27:14:40.0 |
HIP 70315 |
19.96 |
| 2026-08-10 00:00 |
14:23:06.39 |
-27:14:45.8 |
HIP 70315 |
20.06 |
| 2026-08-10 12:00 |
14:22:59.10 |
-27:14:52.3 |
HIP 70315 |
20.31 |
| 2026-08-11 00:00 |
14:22:51.98 |
-27:14:59.6 |
HIP 70205 |
19.40 |
| 2026-08-11 12:00 |
14:22:45.05 |
-27:15:07.6 |
HIP 70205 |
18.44 |
| 2026-08-12 00:00 |
14:22:38.29 |
-27:15:16.4 |
HIP 70205 |
17.59 |
| 2026-08-12 12:00 |
14:22:31.71 |
-27:15:25.9 |
HIP 70205 |
16.86 |
| 2026-08-13 00:00 |
14:22:25.30 |
-27:15:36.2 |
HIP 70205 |
16.27 |
| 2026-08-13 12:00 |
14:22:19.07 |
-27:15:47.2 |
HIP 70205 |
15.82 |
| 2026-08-14 00:00 |
14:22:13.01 |
-27:15:59.0 |
HIP 70205 |
15.50 |
| 2026-08-14 12:00 |
14:22:07.12 |
-27:16:11.5 |
HIP 70205 |
15.32 |
| 2026-08-15 00:00 |
14:22:01.40 |
-27:16:24.8 |
HIP 70205 |
15.27 |
| 2026-08-15 12:00 |
14:21:55.85 |
-27:16:38.9 |
HIP 70205 |
15.34 |
| 2026-08-16 00:00 |
14:21:50.47 |
-27:16:53.7 |
HIP 70205 |
15.53 |
| 2026-08-16 12:00 |
14:21:45.26 |
-27:17:09.3 |
HIP 70205 |
15.83 |
| 2026-08-17 00:00 |
14:21:40.21 |
-27:17:25.7 |
HIP 70205 |
16.21 |
| 2026-08-17 12:00 |
14:21:35.33 |
-27:17:42.8 |
HIP 70205 |
16.67 |
| 2026-08-18 00:00 |
14:21:30.61 |
-27:18:00.7 |
HIP 70205 |
17.19 |
| 2026-08-18 12:00 |
14:21:26.05 |
-27:18:19.3 |
HIP 70205 |
17.77 |
| 2026-08-19 00:00 |
14:21:21.65 |
-27:18:38.7 |
HIP 70205 |
18.39 |