| Parameter |
Value |
| Designation |
C/2024 X4 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2025-09-01T21:49:17.152320Z |
| Orbit solution date (soln_date, UTC) |
2026-03-07T14:43:10Z |
| Obs used |
57 |
| 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) |
2025-05-05.0000000 |
| e |
0.64171387 |
| q (au) |
3.604575 |
| a (au) |
10.060605 |
| i (deg) |
34.669175 |
| Ω (om, deg) |
258.942704 |
| ω (w, deg) |
153.294339 |
| M (ma, deg) |
356.296430 |
Magnitude
Scatter + Global Linear
$$
M_a = (14.731 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
14.731 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.552 |
| 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) |
| 2026-09-20 00:00 |
07:51:51.58 |
+03:52:22.9 |
HIP 38434 |
7.95 |
| 2026-09-20 12:00 |
07:52:11.72 |
+03:48:21.3 |
HIP 38434 |
3.52 |
| 2026-09-21 00:00 |
07:52:31.72 |
+03:44:19.3 |
HIP 38434 |
6.67 |
| 2026-09-21 12:00 |
07:52:51.58 |
+03:40:16.9 |
HIP 38434 |
12.59 |
| 2026-09-22 00:00 |
07:53:11.30 |
+03:36:14.1 |
HIP 38581 |
14.96 |
| 2026-09-22 12:00 |
07:53:30.87 |
+03:32:10.9 |
HIP 38581 |
14.72 |
| 2026-09-23 00:00 |
07:53:50.29 |
+03:28:07.4 |
HIP 38581 |
17.04 |
| 2026-09-23 12:00 |
07:54:09.57 |
+03:24:03.4 |
HIP 38581 |
21.08 |
| 2026-09-24 00:00 |
07:54:28.71 |
+03:19:59.1 |
HIP 38717 |
17.11 |
| 2026-09-24 12:00 |
07:54:47.69 |
+03:15:54.4 |
HIP 38717 |
11.98 |
| 2026-09-25 00:00 |
07:55:06.53 |
+03:11:49.3 |
HIP 38717 |
8.55 |
| 2026-09-25 12:00 |
07:55:25.22 |
+03:07:43.9 |
HIP 38717 |
8.98 |
| 2026-09-26 00:00 |
07:55:43.76 |
+03:03:38.1 |
HIP 38717 |
12.85 |
| 2026-09-26 12:00 |
07:56:02.15 |
+02:59:31.9 |
HIP 38855 |
15.64 |
| 2026-09-27 00:00 |
07:56:20.38 |
+02:55:25.4 |
HIP 38855 |
11.01 |
| 2026-09-27 12:00 |
07:56:38.47 |
+02:51:18.6 |
HIP 38855 |
8.58 |
| 2026-09-28 00:00 |
07:56:56.40 |
+02:47:11.4 |
HIP 38855 |
10.04 |
| 2026-09-28 12:00 |
07:57:14.18 |
+02:43:03.9 |
HIP 38876 |
10.49 |
| 2026-09-29 00:00 |
07:57:31.81 |
+02:38:56.0 |
HIP 38876 |
7.05 |
| 2026-09-29 12:00 |
07:57:49.28 |
+02:34:47.8 |
HIP 38876 |
7.85 |
| 2026-09-30 00:00 |
07:58:06.59 |
+02:30:39.3 |
HIP 38876 |
12.04 |
| 2026-09-30 12:00 |
07:58:23.75 |
+02:26:30.5 |
HIP 38962 |
13.06 |
| 2026-10-01 00:00 |
07:58:40.75 |
+02:22:21.4 |
HIP 38962 |
10.19 |
| 2026-10-01 12:00 |
07:58:57.59 |
+02:18:12.0 |
HIP 38962 |
10.35 |
| 2026-10-02 00:00 |
07:59:14.27 |
+02:14:02.3 |
HIP 38962 |
13.38 |
| 2026-10-02 12:00 |
07:59:30.80 |
+02:09:52.3 |
HIP 38962 |
17.87 |
| 2026-10-03 00:00 |
07:59:47.16 |
+02:05:42.0 |
HIP 39166 |
14.90 |
| 2026-10-03 12:00 |
08:00:03.35 |
+02:01:31.4 |
HIP 39166 |
9.48 |
| 2026-10-04 00:00 |
08:00:19.39 |
+01:57:20.5 |
HIP 39166 |
5.08 |
| 2026-10-04 12:00 |
08:00:35.26 |
+01:53:09.4 |
HIP 39166 |
5.37 |
| 2026-10-05 00:00 |
08:00:50.96 |
+01:48:58.1 |
HIP 39166 |
9.91 |
| 2026-10-05 12:00 |
08:01:06.50 |
+01:44:46.5 |
HIP 39166 |
15.27 |
| 2026-10-06 00:00 |
08:01:21.87 |
+01:40:34.6 |
HIP 39253 |
12.75 |
| 2026-10-06 12:00 |
08:01:37.08 |
+01:36:22.5 |
HIP 39253 |
7.78 |
| 2026-10-07 00:00 |
08:01:52.11 |
+01:32:10.2 |
HIP 39253 |
4.74 |
| 2026-10-07 12:00 |
08:02:06.97 |
+01:27:57.6 |
HIP 39253 |
6.88 |
| 2026-10-08 00:00 |
08:02:21.67 |
+01:23:44.9 |
HIP 39253 |
11.59 |
| 2026-10-08 12:00 |
08:02:36.19 |
+01:19:32.0 |
HIP 39253 |
16.82 |
| 2026-10-09 00:00 |
08:02:50.53 |
+01:15:18.8 |
HIP 39253 |
22.17 |
| 2026-10-09 12:00 |
08:03:04.71 |
+01:11:05.5 |
HIP 39500 |
24.50 |
| 2026-10-10 00:00 |
08:03:18.71 |
+01:06:52.0 |
HIP 39500 |
19.33 |
| 2026-10-10 12:00 |
08:03:32.53 |
+01:02:38.3 |
HIP 39500 |
14.43 |
| 2026-10-11 00:00 |
08:03:46.18 |
+00:58:24.5 |
HIP 39500 |
10.16 |