C/2024 W1 (PANSTARRS)
| Parameter |
Value |
| Designation |
C/2024 W1 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2025-03-19T01:48:39.398400Z |
| Orbit solution date (soln_date, UTC) |
2025-02-13T09:13:00Z |
| Obs used |
27 |
| NEO |
- |
| M1 |
5.100 |
| K1 |
28.750 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2024-11-22T14:32:42.374400Z |
| Discovery magnitude (MPC) |
20.74 w |
| Discovery observatory (MPC) |
F51 · Pan-STARRS 1, Haleakala |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2024-12-13.0000000 |
| e |
0.94290668 |
| q (au) |
2.560778 |
| a (au) |
44.852495 |
| i (deg) |
83.200718 |
| Ω (om, deg) |
310.728342 |
| ω (w, deg) |
256.729174 |
| M (ma, deg) |
359.684763 |
Magnitude
Scatter + Global Linear
$$
M_a = (10.270 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
10.270 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.998 |
| 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) |
| 2026-02-03 00:00 |
21:12:40.71 |
-38:41:31.2 |
HIP 104712 |
0.64 |
| 2026-02-03 12:00 |
21:13:06.91 |
-38:36:50.0 |
HIP 104712 |
6.75 |
| 2026-02-04 00:00 |
21:13:33.03 |
-38:32:10.0 |
HIP 104835 |
8.83 |
| 2026-02-04 12:00 |
21:13:59.07 |
-38:27:31.2 |
HIP 104835 |
7.91 |
| 2026-02-05 00:00 |
21:14:25.03 |
-38:22:53.5 |
HIP 104835 |
11.91 |
| 2026-02-05 12:00 |
21:14:50.89 |
-38:18:16.9 |
HIP 104835 |
17.73 |
| 2026-02-06 00:00 |
21:15:16.68 |
-38:13:41.5 |
HIP 104835 |
24.08 |
| 2026-02-06 12:00 |
21:15:42.38 |
-38:09:07.3 |
HIP 105029 |
21.55 |
| 2026-02-07 00:00 |
21:16:07.99 |
-38:04:34.2 |
HIP 105029 |
15.62 |
| 2026-02-07 12:00 |
21:16:33.51 |
-38:00:02.3 |
HIP 105029 |
10.77 |
| 2026-02-08 00:00 |
21:16:58.95 |
-37:55:31.4 |
HIP 105029 |
8.94 |
| 2026-02-08 12:00 |
21:17:24.30 |
-37:51:01.8 |
HIP 105029 |
11.61 |
| 2026-02-09 00:00 |
21:17:49.56 |
-37:46:33.3 |
HIP 105029 |
16.72 |
| 2026-02-09 12:00 |
21:18:14.74 |
-37:42:05.9 |
HIP 105029 |
22.66 |
| 2026-02-10 00:00 |
21:18:39.82 |
-37:37:39.6 |
HIP 105029 |
28.91 |
| 2026-02-10 12:00 |
21:19:04.82 |
-37:33:14.5 |
HIP 105495 |
34.72 |
| 2026-02-11 00:00 |
21:19:29.72 |
-37:28:50.6 |
HIP 105392 |
29.16 |
| 2026-02-11 12:00 |
21:19:54.54 |
-37:24:27.7 |
HIP 105392 |
22.83 |
| 2026-02-12 00:00 |
21:20:19.26 |
-37:20:06.0 |
HIP 105392 |
16.72 |
| 2026-02-12 12:00 |
21:20:43.89 |
-37:15:45.5 |
HIP 105392 |
11.18 |
| 2026-02-13 00:00 |
21:21:08.43 |
-37:11:26.0 |
HIP 105392 |
7.52 |
| 2026-02-13 12:00 |
21:21:32.88 |
-37:07:07.7 |
HIP 105392 |
8.55 |
| 2026-02-14 00:00 |
21:21:57.23 |
-37:02:50.6 |
HIP 105392 |
13.18 |
| 2026-02-14 12:00 |
21:22:21.49 |
-36:58:34.5 |
HIP 105392 |
18.91 |
| 2026-02-15 00:00 |
21:22:45.65 |
-36:54:19.6 |
HIP 105392 |
24.98 |
| 2026-02-15 12:00 |
21:23:09.72 |
-36:50:05.8 |
HIP 105394 |
29.51 |
| 2026-02-16 00:00 |
21:23:33.69 |
-36:45:53.2 |
HIP 105473 |
29.75 |
| 2026-02-16 12:00 |
21:23:57.57 |
-36:41:41.6 |
HIP 105473 |
30.90 |
| 2026-02-17 00:00 |
21:24:21.34 |
-36:37:31.2 |
HIP 105865 |
27.75 |
| 2026-02-17 12:00 |
21:24:45.02 |
-36:33:22.0 |
HIP 105865 |
21.83 |
| 2026-02-18 00:00 |
21:25:08.60 |
-36:29:13.8 |
HIP 105865 |
16.24 |
| 2026-02-18 12:00 |
21:25:32.08 |
-36:25:06.8 |
HIP 105865 |
11.40 |
| 2026-02-19 00:00 |
21:25:55.46 |
-36:21:00.9 |
HIP 105865 |
8.64 |
| 2026-02-19 12:00 |
21:26:18.74 |
-36:16:56.1 |
HIP 105865 |
9.83 |
| 2026-02-20 00:00 |
21:26:41.92 |
-36:12:52.5 |
HIP 105865 |
13.98 |
| 2026-02-20 12:00 |
21:27:04.99 |
-36:08:50.0 |
HIP 105987 |
11.49 |
| 2026-02-21 00:00 |
21:27:27.97 |
-36:04:48.6 |
HIP 105987 |
10.96 |
| 2026-02-21 12:00 |
21:27:50.83 |
-36:00:48.3 |
HIP 105987 |
13.54 |
| 2026-02-22 00:00 |
21:28:13.60 |
-35:56:49.2 |
HIP 105987 |
17.90 |
| 2026-02-22 12:00 |
21:28:36.26 |
-35:52:51.1 |
HIP 105987 |
23.03 |
| 2026-02-23 00:00 |
21:28:58.81 |
-35:48:54.2 |
HIP 106188 |
21.60 |
| 2026-02-23 12:00 |
21:29:21.25 |
-35:44:58.4 |
HIP 106188 |
20.49 |
| 2026-02-24 00:00 |
21:29:43.59 |
-35:41:03.8 |
HIP 106188 |
21.09 |