| Parameter |
Value |
| Designation |
C/2026 M5 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2026-10-08T17:03:59.800320Z |
| Orbit solution date (soln_date, UTC) |
2026-09-28T14:42:09Z |
| Obs used |
69 |
| NEO |
- |
| M1 |
7.500 |
| K1 |
14.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2026-06-22T12:29:24.028800Z |
| Discovery magnitude (MPC) |
21.52 w |
| Discovery observatory (MPC) |
F52 · Pan-STARRS 2, Haleakala |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2026-07-07.0000000 |
| e |
0.93605914 |
| q (au) |
4.983700 |
| a (au) |
77.942335 |
| i (deg) |
147.455266 |
| Ω (om, deg) |
114.499663 |
| ω (w, deg) |
144.272170 |
| M (ma, deg) |
359.865774 |
Magnitude
Scatter + Global Linear
$$
M_a = (6.903 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
6.903 |
| n |
6.000 |
| gf |
0.994 |
| gb |
-1.000 |
| k |
1.000 |
| δ90 |
9.965 |
| 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) |
| 2026-09-25 00:00 |
20:58:16.92 |
+06:22:58.5 |
HIP 103490 |
31.03 |
| 2026-09-25 12:00 |
20:57:48.23 |
+06:16:31.1 |
HIP 103327 |
26.65 |
| 2026-09-26 00:00 |
20:57:19.81 |
+06:10:04.6 |
HIP 103431 |
21.20 |
| 2026-09-26 12:00 |
20:56:51.66 |
+06:03:38.8 |
HIP 103431 |
16.25 |
| 2026-09-27 00:00 |
20:56:23.77 |
+05:57:13.9 |
HIP 103396 |
13.56 |
| 2026-09-27 12:00 |
20:55:56.16 |
+05:50:49.8 |
HIP 103396 |
14.79 |
| 2026-09-28 00:00 |
20:55:28.81 |
+05:44:26.7 |
HIP 103396 |
20.66 |
| 2026-09-28 12:00 |
20:55:01.73 |
+05:38:04.5 |
HIP 103367 |
26.27 |
| 2026-09-29 00:00 |
20:54:34.93 |
+05:31:43.2 |
HIP 103367 |
29.96 |
| 2026-09-29 12:00 |
20:54:08.40 |
+05:25:22.9 |
HIP 103209 |
25.39 |
| 2026-09-30 00:00 |
20:53:42.14 |
+05:19:03.7 |
HIP 103209 |
22.61 |
| 2026-09-30 12:00 |
20:53:16.15 |
+05:12:45.5 |
HIP 103209 |
23.24 |
| 2026-10-01 00:00 |
20:52:50.44 |
+05:06:28.3 |
HIP 103209 |
27.01 |
| 2026-10-01 12:00 |
20:52:25.00 |
+05:00:12.3 |
HIP 102867 |
29.64 |
| 2026-10-02 00:00 |
20:51:59.84 |
+04:53:57.4 |
HIP 102867 |
25.12 |
| 2026-10-02 12:00 |
20:51:34.95 |
+04:47:43.6 |
HIP 102867 |
23.29 |
| 2026-10-03 00:00 |
20:51:10.35 |
+04:41:31.0 |
HIP 102867 |
24.67 |
| 2026-10-03 12:00 |
20:50:46.01 |
+04:35:19.6 |
HIP 102867 |
28.75 |
| 2026-10-04 00:00 |
20:50:21.96 |
+04:29:09.5 |
HIP 102774 |
31.51 |
| 2026-10-04 12:00 |
20:49:58.19 |
+04:23:00.6 |
HIP 102774 |
23.31 |
| 2026-10-05 00:00 |
20:49:34.69 |
+04:16:53.0 |
HIP 102774 |
15.52 |
| 2026-10-05 12:00 |
20:49:11.47 |
+04:10:46.7 |
HIP 102774 |
9.05 |
| 2026-10-06 00:00 |
20:48:48.54 |
+04:04:41.7 |
HIP 102774 |
7.98 |
| 2026-10-06 12:00 |
20:48:25.88 |
+03:58:38.1 |
HIP 102774 |
13.53 |
| 2026-10-07 00:00 |
20:48:03.50 |
+03:52:35.8 |
HIP 102680 |
14.63 |
| 2026-10-07 12:00 |
20:47:41.41 |
+03:46:34.9 |
HIP 102680 |
13.20 |
| 2026-10-08 00:00 |
20:47:19.59 |
+03:40:35.5 |
HIP 102680 |
16.29 |
| 2026-10-08 12:00 |
20:46:58.05 |
+03:34:37.5 |
HIP 102631 |
20.45 |
| 2026-10-09 00:00 |
20:46:36.80 |
+03:28:40.9 |
HIP 102631 |
20.51 |
| 2026-10-09 12:00 |
20:46:15.82 |
+03:22:45.8 |
HIP 102438 |
17.39 |
| 2026-10-10 00:00 |
20:45:55.13 |
+03:16:52.3 |
HIP 102438 |
9.57 |
| 2026-10-10 12:00 |
20:45:34.71 |
+03:11:00.2 |
HIP 102438 |
1.90 |
| 2026-10-11 00:00 |
20:45:14.58 |
+03:05:09.7 |
HIP 102438 |
5.98 |
| 2026-10-11 12:00 |
20:44:54.72 |
+02:59:20.7 |
HIP 102438 |
13.60 |
| 2026-10-12 00:00 |
20:44:35.14 |
+02:53:33.3 |
HIP 102438 |
21.17 |
| 2026-10-12 12:00 |
20:44:15.85 |
+02:47:47.5 |
HIP 102221 |
25.61 |
| 2026-10-13 00:00 |
20:43:56.83 |
+02:42:03.2 |
HIP 102221 |
25.16 |
| 2026-10-13 12:00 |
20:43:38.09 |
+02:36:20.6 |
HIP 102221 |
26.86 |
| 2026-10-14 00:00 |
20:43:19.62 |
+02:30:39.7 |
HIP 102221 |
30.31 |
| 2026-10-14 12:00 |
20:43:01.44 |
+02:25:00.3 |
HIP 102221 |
34.95 |
| 2026-10-15 00:00 |
20:42:43.53 |
+02:19:22.7 |
HIP 102350 |
38.07 |
| 2026-10-15 12:00 |
20:42:25.89 |
+02:13:46.7 |
HIP 102350 |
36.95 |
| 2026-10-16 00:00 |
20:42:08.53 |
+02:08:12.3 |
HIP 102350 |
37.14 |