| Parameter |
Value |
| Designation |
C/2026 P2 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2027-11-21T16:33:00.869760Z |
| Orbit solution date (soln_date, UTC) |
2026-10-01T14:42:11Z |
| Obs used |
347 |
| NEO |
- |
| M1 |
6.000 |
| K1 |
13.250 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2026-08-11T13:20:08.073600Z |
| Discovery magnitude (MPC) |
19.94 w |
| Discovery observatory (MPC) |
F51 · Pan-STARRS 1, Haleakala |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2026-08-08.0000000 |
| e |
0.99982447 |
| q (au) |
2.480289 |
| a (au) |
14130.128393 |
| i (deg) |
63.013982 |
| Ω (om, deg) |
23.444588 |
| ω (w, deg) |
78.880157 |
| M (ma, deg) |
359.999724 |
Magnitude
Scatter + Global Linear
$$
M_a = (6.738 + 5.389\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
6.738 |
| n |
5.389 |
| gf |
0.998 |
| gb |
-0.513 |
| k |
0.800 |
| δ90 |
9.973 |
| 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 |
01:41:56.78 |
-01:58:57.8 |
HIP 7971 |
12.79 |
| 2026-09-25 12:00 |
01:41:33.95 |
-01:58:40.2 |
HIP 7971 |
16.83 |
| 2026-09-26 00:00 |
01:41:10.93 |
-01:58:22.4 |
HIP 7971 |
21.67 |
| 2026-09-26 12:00 |
01:40:47.75 |
-01:58:04.2 |
HIP 7810 |
22.58 |
| 2026-09-27 00:00 |
01:40:24.39 |
-01:57:45.8 |
HIP 7810 |
21.68 |
| 2026-09-27 12:00 |
01:40:00.86 |
-01:57:27.1 |
HIP 7810 |
22.33 |
| 2026-09-28 00:00 |
01:39:37.16 |
-01:57:08.1 |
HIP 7810 |
24.44 |
| 2026-09-28 12:00 |
01:39:13.30 |
-01:56:48.8 |
HIP 7810 |
27.71 |
| 2026-09-29 00:00 |
01:38:49.27 |
-01:56:29.2 |
HIP 7810 |
31.80 |
| 2026-09-29 12:00 |
01:38:25.08 |
-01:56:09.2 |
HIP 7810 |
36.46 |
| 2026-09-30 00:00 |
01:38:00.74 |
-01:55:48.8 |
HIP 7596 |
37.63 |
| 2026-09-30 12:00 |
01:37:36.23 |
-01:55:28.1 |
HIP 7596 |
37.40 |
| 2026-10-01 00:00 |
01:37:11.57 |
-01:55:07.0 |
HIP 7354 |
36.87 |
| 2026-10-01 12:00 |
01:36:46.76 |
-01:54:45.5 |
HIP 7354 |
30.88 |
| 2026-10-02 00:00 |
01:36:21.81 |
-01:54:23.6 |
HIP 7354 |
24.97 |
| 2026-10-02 12:00 |
01:35:56.70 |
-01:54:01.2 |
HIP 7354 |
19.25 |
| 2026-10-03 00:00 |
01:35:31.45 |
-01:53:38.5 |
HIP 7354 |
13.98 |
| 2026-10-03 12:00 |
01:35:06.06 |
-01:53:15.2 |
HIP 7354 |
10.02 |
| 2026-10-04 00:00 |
01:34:40.53 |
-01:52:51.5 |
HIP 7354 |
9.28 |
| 2026-10-04 12:00 |
01:34:14.87 |
-01:52:27.3 |
HIP 7267 |
9.61 |
| 2026-10-05 00:00 |
01:33:49.07 |
-01:52:02.7 |
HIP 7267 |
3.15 |
| 2026-10-05 12:00 |
01:33:23.15 |
-01:51:37.5 |
HIP 7267 |
3.34 |
| 2026-10-06 00:00 |
01:32:57.09 |
-01:51:11.7 |
HIP 7267 |
9.86 |
| 2026-10-06 12:00 |
01:32:30.92 |
-01:50:45.5 |
HIP 7267 |
16.42 |
| 2026-10-07 00:00 |
01:32:04.63 |
-01:50:18.6 |
HIP 7267 |
23.00 |
| 2026-10-07 12:00 |
01:31:38.22 |
-01:49:51.2 |
HIP 7267 |
29.62 |
| 2026-10-08 00:00 |
01:31:11.69 |
-01:49:23.3 |
HIP 7085 |
30.62 |
| 2026-10-08 12:00 |
01:30:45.06 |
-01:48:54.7 |
HIP 7085 |
32.02 |
| 2026-10-09 00:00 |
01:30:18.32 |
-01:48:25.5 |
HIP 7085 |
34.70 |
| 2026-10-09 12:00 |
01:29:51.48 |
-01:47:55.6 |
HIP 6840 |
31.01 |
| 2026-10-10 00:00 |
01:29:24.54 |
-01:47:25.1 |
HIP 6833 |
25.27 |
| 2026-10-10 12:00 |
01:28:57.51 |
-01:46:54.0 |
HIP 6833 |
19.92 |
| 2026-10-11 00:00 |
01:28:30.38 |
-01:46:22.1 |
HIP 6833 |
15.71 |
| 2026-10-11 12:00 |
01:28:03.16 |
-01:45:49.6 |
HIP 6833 |
13.77 |
| 2026-10-12 00:00 |
01:27:35.87 |
-01:45:16.3 |
HIP 6833 |
15.03 |
| 2026-10-12 12:00 |
01:27:08.49 |
-01:44:42.4 |
HIP 6833 |
18.89 |
| 2026-10-13 00:00 |
01:26:41.03 |
-01:44:07.7 |
HIP 6833 |
24.15 |
| 2026-10-13 12:00 |
01:26:13.50 |
-01:43:32.2 |
HIP 6700 |
28.58 |
| 2026-10-14 00:00 |
01:25:45.90 |
-01:42:56.0 |
HIP 6700 |
29.56 |
| 2026-10-14 12:00 |
01:25:18.24 |
-01:42:19.0 |
HIP 6700 |
32.07 |
| 2026-10-15 00:00 |
01:24:50.51 |
-01:41:41.2 |
HIP 6700 |
35.78 |
| 2026-10-15 12:00 |
01:24:22.73 |
-01:41:02.7 |
HIP 6639 |
39.29 |
| 2026-10-16 00:00 |
01:23:54.90 |
-01:40:23.3 |
HIP 6368 |
37.10 |