| 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) |
| 2026-07-29 00:00 |
07:05:23.93 |
+10:07:59.1 |
HIP 34272 |
15.34 |
| 2026-07-29 12:00 |
07:05:54.95 |
+10:04:59.7 |
HIP 34272 |
12.29 |
| 2026-07-30 00:00 |
07:06:25.91 |
+10:01:59.6 |
HIP 34337 |
13.44 |
| 2026-07-30 12:00 |
07:06:56.79 |
+09:58:58.9 |
HIP 34337 |
6.59 |
| 2026-07-31 00:00 |
07:07:27.61 |
+09:55:57.4 |
HIP 34337 |
6.29 |
| 2026-07-31 12:00 |
07:07:58.36 |
+09:52:55.3 |
HIP 34337 |
13.00 |
| 2026-08-01 00:00 |
07:08:29.04 |
+09:49:52.5 |
HIP 34474 |
12.04 |
| 2026-08-01 12:00 |
07:08:59.65 |
+09:46:49.0 |
HIP 34474 |
15.21 |
| 2026-08-02 00:00 |
07:09:30.19 |
+09:43:44.8 |
HIP 34474 |
21.22 |
| 2026-08-02 12:00 |
07:10:00.65 |
+09:40:39.9 |
HIP 34672 |
21.70 |
| 2026-08-03 00:00 |
07:10:31.05 |
+09:37:34.3 |
HIP 34672 |
15.60 |
| 2026-08-03 12:00 |
07:11:01.37 |
+09:34:28.1 |
HIP 34672 |
12.13 |
| 2026-08-04 00:00 |
07:11:31.62 |
+09:31:21.2 |
HIP 34672 |
13.47 |
| 2026-08-04 12:00 |
07:12:01.80 |
+09:28:13.6 |
HIP 34672 |
18.59 |
| 2026-08-05 00:00 |
07:12:31.91 |
+09:25:05.3 |
HIP 34672 |
25.28 |
| 2026-08-05 12:00 |
07:13:01.94 |
+09:21:56.3 |
HIP 34672 |
32.59 |
| 2026-08-06 00:00 |
07:13:31.89 |
+09:18:46.7 |
HIP 35101 |
31.21 |
| 2026-08-06 12:00 |
07:14:01.77 |
+09:15:36.4 |
HIP 35101 |
26.05 |
| 2026-08-07 00:00 |
07:14:31.57 |
+09:12:25.4 |
HIP 35101 |
22.65 |
| 2026-08-07 12:00 |
07:15:01.30 |
+09:09:13.7 |
HIP 35101 |
21.82 |
| 2026-08-08 00:00 |
07:15:30.94 |
+09:06:01.4 |
HIP 35215 |
22.90 |
| 2026-08-08 12:00 |
07:16:00.51 |
+09:02:48.4 |
HIP 35215 |
15.53 |
| 2026-08-09 00:00 |
07:16:30.00 |
+08:59:34.7 |
HIP 35215 |
9.23 |
| 2026-08-09 12:00 |
07:16:59.41 |
+08:56:20.3 |
HIP 35215 |
7.46 |
| 2026-08-10 00:00 |
07:17:28.73 |
+08:53:05.3 |
HIP 35215 |
12.34 |
| 2026-08-10 12:00 |
07:17:57.98 |
+08:49:49.6 |
HIP 35215 |
19.34 |
| 2026-08-11 00:00 |
07:18:27.14 |
+08:46:33.2 |
HIP 35419 |
17.97 |
| 2026-08-11 12:00 |
07:18:56.22 |
+08:43:16.2 |
HIP 35419 |
14.27 |
| 2026-08-12 00:00 |
07:19:25.22 |
+08:39:58.5 |
HIP 35419 |
14.45 |
| 2026-08-12 12:00 |
07:19:54.13 |
+08:36:40.2 |
HIP 35419 |
18.37 |
| 2026-08-13 00:00 |
07:20:22.95 |
+08:33:21.2 |
HIP 35482 |
21.72 |
| 2026-08-13 12:00 |
07:20:51.69 |
+08:30:01.5 |
HIP 35482 |
25.06 |
| 2026-08-14 00:00 |
07:21:20.34 |
+08:26:41.2 |
HIP 35756 |
28.59 |
| 2026-08-14 12:00 |
07:21:48.91 |
+08:23:20.3 |
HIP 35756 |
27.96 |
| 2026-08-15 00:00 |
07:22:17.38 |
+08:19:58.6 |
HIP 35756 |
29.48 |
| 2026-08-15 12:00 |
07:22:45.77 |
+08:16:36.4 |
HIP 35756 |
32.84 |
| 2026-08-16 00:00 |
07:23:14.06 |
+08:13:13.5 |
HIP 35756 |
37.55 |
| 2026-08-16 12:00 |
07:23:42.27 |
+08:09:50.0 |
HIP 35808 |
39.21 |
| 2026-08-17 00:00 |
07:24:10.38 |
+08:06:25.8 |
HIP 35808 |
38.21 |
| 2026-08-17 12:00 |
07:24:38.40 |
+08:03:01.0 |
HIP 36042 |
32.98 |
| 2026-08-18 00:00 |
07:25:06.33 |
+07:59:35.6 |
HIP 36042 |
27.17 |
| 2026-08-18 12:00 |
07:25:34.16 |
+07:56:09.5 |
HIP 36042 |
22.54 |
| 2026-08-19 00:00 |
07:26:01.90 |
+07:52:42.8 |
HIP 36042 |
19.89 |