| 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 |
-1.000 |
| 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) |
| 2026-07-29 00:00 |
21:05:47.44 |
-28:08:16.1 |
HIP 104226 |
24.15 |
| 2026-07-29 12:00 |
21:05:16.05 |
-28:07:26.9 |
HIP 104001 |
23.35 |
| 2026-07-30 00:00 |
21:04:44.66 |
-28:06:36.8 |
HIP 104001 |
19.36 |
| 2026-07-30 12:00 |
21:04:13.30 |
-28:05:45.7 |
HIP 104001 |
17.36 |
| 2026-07-31 00:00 |
21:03:41.97 |
-28:04:53.8 |
HIP 104001 |
18.01 |
| 2026-07-31 12:00 |
21:03:10.66 |
-28:04:00.9 |
HIP 103902 |
20.13 |
| 2026-08-01 00:00 |
21:02:39.38 |
-28:03:07.1 |
HIP 103902 |
20.40 |
| 2026-08-01 12:00 |
21:02:08.14 |
-28:02:12.4 |
HIP 103759 |
16.03 |
| 2026-08-02 00:00 |
21:01:36.94 |
-28:01:16.8 |
HIP 103759 |
13.11 |
| 2026-08-02 12:00 |
21:01:05.78 |
-28:00:20.2 |
HIP 103759 |
13.53 |
| 2026-08-03 00:00 |
21:00:34.67 |
-27:59:22.7 |
HIP 103759 |
17.03 |
| 2026-08-03 12:00 |
21:00:03.61 |
-27:58:24.2 |
HIP 103759 |
22.20 |
| 2026-08-04 00:00 |
20:59:32.61 |
-27:57:24.8 |
HIP 103547 |
20.31 |
| 2026-08-04 12:00 |
20:59:01.66 |
-27:56:24.5 |
HIP 103547 |
18.62 |
| 2026-08-05 00:00 |
20:58:30.77 |
-27:55:23.3 |
HIP 103459 |
15.44 |
| 2026-08-05 12:00 |
20:57:59.95 |
-27:54:21.1 |
HIP 103459 |
10.59 |
| 2026-08-06 00:00 |
20:57:29.19 |
-27:53:18.0 |
HIP 103459 |
8.98 |
| 2026-08-06 12:00 |
20:56:58.51 |
-27:52:13.9 |
HIP 103459 |
11.97 |
| 2026-08-07 00:00 |
20:56:27.91 |
-27:51:08.9 |
HIP 103459 |
17.30 |
| 2026-08-07 12:00 |
20:55:57.38 |
-27:50:03.0 |
HIP 103207 |
18.91 |
| 2026-08-08 00:00 |
20:55:26.94 |
-27:48:56.1 |
HIP 103207 |
13.22 |
| 2026-08-08 12:00 |
20:54:56.59 |
-27:47:48.3 |
HIP 103207 |
9.23 |
| 2026-08-09 00:00 |
20:54:26.32 |
-27:46:39.6 |
HIP 103207 |
9.41 |
| 2026-08-09 12:00 |
20:53:56.15 |
-27:45:29.9 |
HIP 103168 |
10.28 |
| 2026-08-10 00:00 |
20:53:26.08 |
-27:44:19.3 |
HIP 103168 |
14.33 |
| 2026-08-10 12:00 |
20:52:56.11 |
-27:43:07.8 |
HIP 103097 |
19.08 |
| 2026-08-11 00:00 |
20:52:26.25 |
-27:41:55.3 |
HIP 102959 |
20.95 |
| 2026-08-11 12:00 |
20:51:56.49 |
-27:40:41.9 |
HIP 102959 |
19.54 |
| 2026-08-12 00:00 |
20:51:26.85 |
-27:39:27.6 |
HIP 102959 |
20.36 |
| 2026-08-12 12:00 |
20:50:57.32 |
-27:38:12.4 |
HIP 102848 |
19.81 |
| 2026-08-13 00:00 |
20:50:27.91 |
-27:36:56.2 |
HIP 102845 |
15.72 |
| 2026-08-13 12:00 |
20:49:58.62 |
-27:35:39.2 |
HIP 102845 |
13.67 |
| 2026-08-14 00:00 |
20:49:29.46 |
-27:34:21.2 |
HIP 102845 |
14.61 |
| 2026-08-14 12:00 |
20:49:00.43 |
-27:33:02.3 |
HIP 102845 |
18.06 |
| 2026-08-15 00:00 |
20:48:31.54 |
-27:31:42.5 |
HIP 102641 |
15.83 |
| 2026-08-15 12:00 |
20:48:02.78 |
-27:30:21.9 |
HIP 102641 |
14.82 |
| 2026-08-16 00:00 |
20:47:34.15 |
-27:29:00.3 |
HIP 102581 |
13.47 |
| 2026-08-16 12:00 |
20:47:05.67 |
-27:27:37.8 |
HIP 102581 |
14.48 |
| 2026-08-17 00:00 |
20:46:37.34 |
-27:26:14.5 |
HIP 102471 |
14.38 |
| 2026-08-17 12:00 |
20:46:09.15 |
-27:24:50.3 |
HIP 102471 |
12.17 |
| 2026-08-18 00:00 |
20:45:41.12 |
-27:23:25.2 |
HIP 102414 |
10.60 |
| 2026-08-18 12:00 |
20:45:13.24 |
-27:21:59.3 |
HIP 102414 |
7.15 |
| 2026-08-19 00:00 |
20:44:45.51 |
-27:20:32.5 |
HIP 102414 |
8.38 |