| 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) |
| 2026-05-12 00:00 |
21:58:39.52 |
-29:20:26.1 |
HIP 108416 |
17.38 |
| 2026-05-12 12:00 |
21:58:36.39 |
-29:19:23.3 |
HIP 108416 |
16.13 |
| 2026-05-13 00:00 |
21:58:33.02 |
-29:18:21.4 |
HIP 108416 |
14.87 |
| 2026-05-13 12:00 |
21:58:29.42 |
-29:17:20.5 |
HIP 108416 |
13.59 |
| 2026-05-14 00:00 |
21:58:25.59 |
-29:16:20.7 |
HIP 108416 |
12.29 |
| 2026-05-14 12:00 |
21:58:21.52 |
-29:15:21.8 |
HIP 108416 |
10.97 |
| 2026-05-15 00:00 |
21:58:17.22 |
-29:14:23.9 |
HIP 108416 |
9.63 |
| 2026-05-15 12:00 |
21:58:12.68 |
-29:13:27.1 |
HIP 108416 |
8.27 |
| 2026-05-16 00:00 |
21:58:07.91 |
-29:12:31.2 |
HIP 108416 |
6.89 |
| 2026-05-16 12:00 |
21:58:02.89 |
-29:11:36.2 |
HIP 108416 |
5.52 |
| 2026-05-17 00:00 |
21:57:57.64 |
-29:10:42.3 |
HIP 108416 |
4.17 |
| 2026-05-17 12:00 |
21:57:52.15 |
-29:09:49.3 |
HIP 108416 |
2.93 |
| 2026-05-18 00:00 |
21:57:46.42 |
-29:08:57.2 |
HIP 108416 |
2.08 |
| 2026-05-18 12:00 |
21:57:40.45 |
-29:08:06.1 |
HIP 108416 |
2.23 |
| 2026-05-19 00:00 |
21:57:34.24 |
-29:07:15.9 |
HIP 108416 |
3.29 |
| 2026-05-19 12:00 |
21:57:27.79 |
-29:06:26.7 |
HIP 108416 |
4.71 |
| 2026-05-20 00:00 |
21:57:21.10 |
-29:05:38.3 |
HIP 108416 |
6.28 |
| 2026-05-20 12:00 |
21:57:14.16 |
-29:04:50.9 |
HIP 108416 |
7.95 |
| 2026-05-21 00:00 |
21:57:06.98 |
-29:04:04.4 |
HIP 108416 |
9.67 |
| 2026-05-21 12:00 |
21:56:59.56 |
-29:03:18.8 |
HIP 108416 |
11.45 |
| 2026-05-22 00:00 |
21:56:51.89 |
-29:02:34.0 |
HIP 108416 |
13.27 |
| 2026-05-22 12:00 |
21:56:43.99 |
-29:01:50.2 |
HIP 108328 |
12.80 |
| 2026-05-23 00:00 |
21:56:35.83 |
-29:01:07.2 |
HIP 108328 |
12.33 |
| 2026-05-23 12:00 |
21:56:27.44 |
-29:00:25.1 |
HIP 108328 |
12.18 |
| 2026-05-24 00:00 |
21:56:18.79 |
-28:59:43.8 |
HIP 108328 |
12.38 |
| 2026-05-24 12:00 |
21:56:09.91 |
-28:59:03.3 |
HIP 108328 |
12.94 |
| 2026-05-25 00:00 |
21:56:00.78 |
-28:58:23.7 |
HIP 108328 |
13.84 |
| 2026-05-25 12:00 |
21:55:51.40 |
-28:57:44.9 |
HIP 108328 |
15.03 |
| 2026-05-26 00:00 |
21:55:41.78 |
-28:57:06.9 |
HIP 108328 |
16.48 |
| 2026-05-26 12:00 |
21:55:31.91 |
-28:56:29.7 |
HIP 108328 |
18.13 |
| 2026-05-27 00:00 |
21:55:21.80 |
-28:55:53.3 |
HIP 108328 |
19.95 |
| 2026-05-27 12:00 |
21:55:11.44 |
-28:55:17.7 |
HIP 108328 |
21.92 |
| 2026-05-28 00:00 |
21:55:00.83 |
-28:54:42.8 |
HIP 108065 |
22.61 |
| 2026-05-28 12:00 |
21:54:49.98 |
-28:54:08.7 |
HIP 108065 |
20.45 |
| 2026-05-29 00:00 |
21:54:38.88 |
-28:53:35.4 |
HIP 108065 |
18.33 |
| 2026-05-29 12:00 |
21:54:27.53 |
-28:53:02.8 |
HIP 108065 |
16.30 |
| 2026-05-30 00:00 |
21:54:15.94 |
-28:52:30.9 |
HIP 108065 |
14.42 |
| 2026-05-30 12:00 |
21:54:04.10 |
-28:51:59.8 |
HIP 108065 |
12.77 |
| 2026-05-31 00:00 |
21:53:52.01 |
-28:51:29.3 |
HIP 108065 |
11.51 |
| 2026-05-31 12:00 |
21:53:39.68 |
-28:50:59.6 |
HIP 108065 |
10.80 |
| 2026-06-01 00:00 |
21:53:27.10 |
-28:50:30.6 |
HIP 108009 |
8.19 |
| 2026-06-01 12:00 |
21:53:14.27 |
-28:50:02.2 |
HIP 108009 |
5.72 |
| 2026-06-02 00:00 |
21:53:01.19 |
-28:49:34.5 |
HIP 108009 |
3.80 |