C/2024 X4 (PANSTARRS)
| Parameter |
Value |
| Designation |
C/2024 X4 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2025-09-01T21:47:40.418880Z |
| Orbit solution date (soln_date, UTC) |
2026-01-13T08:12:18Z |
| Obs used |
55 |
| NEO |
- |
| M1 |
16.000 |
| K1 |
4.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2024-12-08T05:19:38.726400Z |
| Discovery magnitude (MPC) |
21.38 w |
| Discovery observatory (MPC) |
F51 · Pan-STARRS 1, Haleakala |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2025-04-26.0000000 |
| e |
0.64169311 |
| q (au) |
3.604579 |
| a (au) |
10.060034 |
| i (deg) |
34.669161 |
| Ω (om, deg) |
258.942729 |
| ω (w, deg) |
153.293972 |
| M (ma, deg) |
356.018148 |
Magnitude
Scatter + Global Linear
$$
M_a = (8.345 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
8.345 |
| 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
Finding Chart
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
04:15:18.67 |
+20:41:00.0 |
HIP 19870 |
9.89 |
| 2026-02-03 12:00 |
04:15:27.20 |
+20:38:05.5 |
HIP 19870 |
11.65 |
| 2026-02-04 00:00 |
04:15:36.00 |
+20:35:12.6 |
HIP 19870 |
14.06 |
| 2026-02-04 12:00 |
04:15:45.04 |
+20:32:21.2 |
HIP 19870 |
16.85 |
| 2026-02-05 00:00 |
04:15:54.34 |
+20:29:31.5 |
HIP 19990 |
19.74 |
| 2026-02-05 12:00 |
04:16:03.89 |
+20:26:43.3 |
HIP 19997 |
18.13 |
| 2026-02-06 00:00 |
04:16:13.69 |
+20:23:56.6 |
HIP 19997 |
16.82 |
| 2026-02-06 12:00 |
04:16:23.74 |
+20:21:11.6 |
HIP 19997 |
16.16 |
| 2026-02-07 00:00 |
04:16:34.04 |
+20:18:28.0 |
HIP 19997 |
16.24 |
| 2026-02-07 12:00 |
04:16:44.59 |
+20:15:46.0 |
HIP 19997 |
17.06 |
| 2026-02-08 00:00 |
04:16:55.38 |
+20:13:05.5 |
HIP 19997 |
18.54 |
| 2026-02-08 12:00 |
04:17:06.42 |
+20:10:26.6 |
HIP 19997 |
20.54 |
| 2026-02-09 00:00 |
04:17:17.70 |
+20:07:49.1 |
HIP 20084 |
20.24 |
| 2026-02-09 12:00 |
04:17:29.22 |
+20:05:13.2 |
HIP 20084 |
20.38 |
| 2026-02-10 00:00 |
04:17:40.99 |
+20:02:38.7 |
HIP 20130 |
19.86 |
| 2026-02-10 12:00 |
04:17:52.99 |
+20:00:05.7 |
HIP 20130 |
16.28 |
| 2026-02-11 00:00 |
04:18:05.23 |
+19:57:34.2 |
HIP 20130 |
12.78 |
| 2026-02-11 12:00 |
04:18:17.71 |
+19:55:04.1 |
HIP 20130 |
9.47 |
| 2026-02-12 00:00 |
04:18:30.43 |
+19:52:35.5 |
HIP 20130 |
6.71 |
| 2026-02-12 12:00 |
04:18:43.38 |
+19:50:08.3 |
HIP 20130 |
5.47 |
| 2026-02-13 00:00 |
04:18:56.56 |
+19:47:42.5 |
HIP 20130 |
6.71 |
| 2026-02-13 12:00 |
04:19:09.98 |
+19:45:18.2 |
HIP 20130 |
9.54 |
| 2026-02-14 00:00 |
04:19:23.63 |
+19:42:55.2 |
HIP 20130 |
12.98 |
| 2026-02-14 12:00 |
04:19:37.50 |
+19:40:33.7 |
HIP 20175 |
16.40 |
| 2026-02-15 00:00 |
04:19:51.61 |
+19:38:13.5 |
HIP 20175 |
19.32 |
| 2026-02-15 12:00 |
04:20:05.94 |
+19:35:54.7 |
HIP 20237 |
21.96 |
| 2026-02-16 00:00 |
04:20:20.50 |
+19:33:37.2 |
HIP 20237 |
19.69 |
| 2026-02-16 12:00 |
04:20:35.28 |
+19:31:21.1 |
HIP 20369 |
16.18 |
| 2026-02-17 00:00 |
04:20:50.29 |
+19:29:06.3 |
HIP 20369 |
12.36 |
| 2026-02-17 12:00 |
04:21:05.51 |
+19:26:52.8 |
HIP 20369 |
8.82 |
| 2026-02-18 00:00 |
04:21:20.96 |
+19:24:40.6 |
HIP 20369 |
6.14 |
| 2026-02-18 12:00 |
04:21:36.62 |
+19:22:29.7 |
HIP 20369 |
5.79 |
| 2026-02-19 00:00 |
04:21:52.51 |
+19:20:20.1 |
HIP 20369 |
8.12 |
| 2026-02-19 12:00 |
04:22:08.60 |
+19:18:11.8 |
HIP 20369 |
11.66 |
| 2026-02-20 00:00 |
04:22:24.92 |
+19:16:04.7 |
HIP 20369 |
15.64 |
| 2026-02-20 12:00 |
04:22:41.44 |
+19:13:58.8 |
HIP 20369 |
19.82 |
| 2026-02-21 00:00 |
04:22:58.18 |
+19:11:54.2 |
HIP 20369 |
24.10 |
| 2026-02-21 12:00 |
04:23:15.12 |
+19:09:50.8 |
HIP 20614 |
25.17 |
| 2026-02-22 00:00 |
04:23:32.27 |
+19:07:48.6 |
HIP 20614 |
20.72 |
| 2026-02-22 12:00 |
04:23:49.63 |
+19:05:47.5 |
HIP 20614 |
16.26 |
| 2026-02-23 00:00 |
04:24:07.20 |
+19:03:47.6 |
HIP 20614 |
11.85 |
| 2026-02-23 12:00 |
04:24:24.96 |
+19:01:48.9 |
HIP 20614 |
7.62 |
| 2026-02-24 00:00 |
04:24:42.93 |
+18:59:51.3 |
HIP 20614 |
4.28 |