| Parameter |
Value |
| Designation |
C/2024 U1 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2024-06-30T16:18:58.452480Z |
| Orbit solution date (soln_date, UTC) |
2025-09-23T14:42:08Z |
| Obs used |
119 |
| NEO |
- |
| M1 |
14.300 |
| K1 |
4.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2024-10-30T13:14:09.859200Z |
| Discovery magnitude (MPC) |
20.81 w |
| Discovery observatory (MPC) |
F51 · Pan-STARRS 1, Haleakala |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2024-10-01.0000000 |
| e |
0.99368257 |
| q (au) |
4.835875 |
| a (au) |
765.481304 |
| i (deg) |
128.723018 |
| Ω (om, deg) |
270.243999 |
| ω (w, deg) |
188.077278 |
| M (ma, deg) |
0.004296 |
Magnitude
Scatter + Global Linear
$$
M_a = (12.950 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
12.950 |
| n |
2.000 |
| gf |
0.946 |
| gb |
-0.984 |
| k |
1.000 |
| δ90 |
9.106 |
| 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) |
| 2026-09-20 00:00 |
02:42:21.29 |
-45:39:13.5 |
HIP 12583 |
6.61 |
| 2026-09-20 12:00 |
02:41:57.92 |
-45:43:17.7 |
HIP 12583 |
7.34 |
| 2026-09-21 00:00 |
02:41:34.35 |
-45:47:20.4 |
HIP 12583 |
11.42 |
| 2026-09-21 12:00 |
02:41:10.61 |
-45:51:21.6 |
HIP 12583 |
16.52 |
| 2026-09-22 00:00 |
02:40:46.68 |
-45:55:21.3 |
HIP 12583 |
21.95 |
| 2026-09-22 12:00 |
02:40:22.57 |
-45:59:19.4 |
HIP 12583 |
27.51 |
| 2026-09-23 00:00 |
02:39:58.28 |
-46:03:16.0 |
HIP 12583 |
33.14 |
| 2026-09-23 12:00 |
02:39:33.81 |
-46:07:11.0 |
HIP 12611 |
36.08 |
| 2026-09-24 00:00 |
02:39:09.17 |
-46:11:04.4 |
HIP 12120 |
31.61 |
| 2026-09-24 12:00 |
02:38:44.36 |
-46:14:56.1 |
HIP 12120 |
27.02 |
| 2026-09-25 00:00 |
02:38:19.37 |
-46:18:46.2 |
HIP 12229 |
21.92 |
| 2026-09-25 12:00 |
02:37:54.21 |
-46:22:34.7 |
HIP 12229 |
16.85 |
| 2026-09-26 00:00 |
02:37:28.88 |
-46:26:21.4 |
HIP 12229 |
12.42 |
| 2026-09-26 12:00 |
02:37:03.39 |
-46:30:06.4 |
HIP 12229 |
9.59 |
| 2026-09-27 00:00 |
02:36:37.72 |
-46:33:49.6 |
HIP 12229 |
9.84 |
| 2026-09-27 12:00 |
02:36:11.90 |
-46:37:31.1 |
HIP 12229 |
12.99 |
| 2026-09-28 00:00 |
02:35:45.91 |
-46:41:10.9 |
HIP 12156 |
15.99 |
| 2026-09-28 12:00 |
02:35:19.77 |
-46:44:48.8 |
HIP 12156 |
16.56 |
| 2026-09-29 00:00 |
02:34:53.47 |
-46:48:24.9 |
HIP 12156 |
18.98 |
| 2026-09-29 12:00 |
02:34:27.01 |
-46:51:59.1 |
HIP 12156 |
22.66 |
| 2026-09-30 00:00 |
02:34:00.39 |
-46:55:31.5 |
HIP 12156 |
27.10 |
| 2026-09-30 12:00 |
02:33:33.63 |
-46:59:02.0 |
HIP 11711 |
30.50 |
| 2026-10-01 00:00 |
02:33:06.72 |
-47:02:30.6 |
HIP 11711 |
29.27 |
| 2026-10-01 12:00 |
02:32:39.65 |
-47:05:57.3 |
HIP 11704 |
26.60 |
| 2026-10-02 00:00 |
02:32:12.45 |
-47:09:22.0 |
HIP 11704 |
21.08 |
| 2026-10-02 12:00 |
02:31:45.10 |
-47:12:44.8 |
HIP 11704 |
15.73 |
| 2026-10-03 00:00 |
02:31:17.61 |
-47:16:05.5 |
HIP 11704 |
10.81 |
| 2026-10-03 12:00 |
02:30:49.98 |
-47:19:24.3 |
HIP 11704 |
7.27 |
| 2026-10-04 00:00 |
02:30:22.21 |
-47:22:41.0 |
HIP 11704 |
7.42 |
| 2026-10-04 12:00 |
02:29:54.31 |
-47:25:55.7 |
HIP 11704 |
11.11 |
| 2026-10-05 00:00 |
02:29:26.28 |
-47:29:08.4 |
HIP 11704 |
16.05 |
| 2026-10-05 12:00 |
02:28:58.12 |
-47:32:18.9 |
HIP 11704 |
21.39 |
| 2026-10-06 00:00 |
02:28:29.84 |
-47:35:27.4 |
HIP 11407 |
16.72 |
| 2026-10-06 12:00 |
02:28:01.43 |
-47:38:33.7 |
HIP 11407 |
11.11 |
| 2026-10-07 00:00 |
02:27:32.90 |
-47:41:37.9 |
HIP 11407 |
5.72 |
| 2026-10-07 12:00 |
02:27:04.25 |
-47:44:39.9 |
HIP 11407 |
2.58 |
| 2026-10-08 00:00 |
02:26:35.49 |
-47:47:39.8 |
HIP 11407 |
6.73 |
| 2026-10-08 12:00 |
02:26:06.61 |
-47:50:37.4 |
HIP 11407 |
12.18 |
| 2026-10-09 00:00 |
02:25:37.63 |
-47:53:32.9 |
HIP 11181 |
16.47 |
| 2026-10-09 12:00 |
02:25:08.54 |
-47:56:26.1 |
HIP 11181 |
11.60 |
| 2026-10-10 00:00 |
02:24:39.35 |
-47:59:17.1 |
HIP 11181 |
7.85 |
| 2026-10-10 12:00 |
02:24:10.05 |
-48:02:05.9 |
HIP 11181 |
7.22 |
| 2026-10-11 00:00 |
02:23:40.66 |
-48:04:52.4 |
HIP 11181 |
10.30 |