| Parameter |
Value |
| Designation |
C/2024 X2 (ATLAS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2025-07-07T21:15:45.933120Z |
| Orbit solution date (soln_date, UTC) |
2026-04-14T13:42:19Z |
| Obs used |
502 |
| NEO |
- |
| M1 |
6.900 |
| K1 |
14.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2024-12-12T07:14:54.009600Z |
| Discovery magnitude (MPC) |
18.84 o |
| Discovery observatory (MPC) |
W68 · ATLAS Chile, Rio Hurtado |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2025-07-05.0000000 |
| e |
0.92731330 |
| q (au) |
3.676303 |
| a (au) |
50.577374 |
| i (deg) |
109.221297 |
| Ω (om, deg) |
122.522625 |
| ω (w, deg) |
315.782593 |
| M (ma, deg) |
359.992092 |
Magnitude
Scatter + Global Linear
$$
M_a = (5.435 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
5.435 |
| 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 |
07:26:07.15 |
+28:38:22.7 |
HIP 36220 |
22.02 |
| 2026-05-12 12:00 |
07:26:18.72 |
+28:40:45.8 |
HIP 36220 |
21.39 |
| 2026-05-13 00:00 |
07:26:30.44 |
+28:43:08.1 |
HIP 36220 |
21.29 |
| 2026-05-13 12:00 |
07:26:42.32 |
+28:45:29.5 |
HIP 36220 |
21.73 |
| 2026-05-14 00:00 |
07:26:54.35 |
+28:47:50.2 |
HIP 36220 |
22.69 |
| 2026-05-14 12:00 |
07:27:06.53 |
+28:50:10.1 |
HIP 36220 |
24.11 |
| 2026-05-15 00:00 |
07:27:18.85 |
+28:52:29.2 |
HIP 36220 |
25.92 |
| 2026-05-15 12:00 |
07:27:31.33 |
+28:54:47.5 |
HIP 36221 |
24.02 |
| 2026-05-16 00:00 |
07:27:43.95 |
+28:57:05.0 |
HIP 36221 |
21.86 |
| 2026-05-16 12:00 |
07:27:56.72 |
+28:59:21.8 |
HIP 36221 |
20.14 |
| 2026-05-17 00:00 |
07:28:09.63 |
+29:01:37.9 |
HIP 36221 |
18.97 |
| 2026-05-17 12:00 |
07:28:22.68 |
+29:03:53.2 |
HIP 36221 |
18.48 |
| 2026-05-18 00:00 |
07:28:35.87 |
+29:06:07.8 |
HIP 36221 |
18.72 |
| 2026-05-18 12:00 |
07:28:49.21 |
+29:08:21.7 |
HIP 36291 |
18.95 |
| 2026-05-19 00:00 |
07:29:02.67 |
+29:10:34.9 |
HIP 36479 |
17.41 |
| 2026-05-19 12:00 |
07:29:16.27 |
+29:12:47.4 |
HIP 36479 |
14.47 |
| 2026-05-20 00:00 |
07:29:30.01 |
+29:14:59.2 |
HIP 36479 |
11.93 |
| 2026-05-20 12:00 |
07:29:43.88 |
+29:17:10.3 |
HIP 36479 |
10.13 |
| 2026-05-21 00:00 |
07:29:57.88 |
+29:19:20.8 |
HIP 36480 |
6.39 |
| 2026-05-21 12:00 |
07:30:12.01 |
+29:21:30.6 |
HIP 36480 |
2.63 |
| 2026-05-22 00:00 |
07:30:26.26 |
+29:23:39.8 |
HIP 36480 |
1.16 |
| 2026-05-22 12:00 |
07:30:40.64 |
+29:25:48.3 |
HIP 36480 |
4.95 |
| 2026-05-23 00:00 |
07:30:55.15 |
+29:27:56.2 |
HIP 36480 |
8.75 |
| 2026-05-23 12:00 |
07:31:09.78 |
+29:30:03.4 |
HIP 36480 |
12.58 |
| 2026-05-24 00:00 |
07:31:24.53 |
+29:32:10.1 |
HIP 36480 |
16.42 |
| 2026-05-24 12:00 |
07:31:39.40 |
+29:34:16.1 |
HIP 36480 |
20.27 |
| 2026-05-25 00:00 |
07:31:54.39 |
+29:36:21.6 |
HIP 36454 |
23.92 |
| 2026-05-25 12:00 |
07:32:09.50 |
+29:38:26.5 |
HIP 36454 |
27.38 |
| 2026-05-26 00:00 |
07:32:24.72 |
+29:40:30.7 |
HIP 36815 |
30.27 |
| 2026-05-26 12:00 |
07:32:40.06 |
+29:42:34.4 |
HIP 36815 |
28.96 |
| 2026-05-27 00:00 |
07:32:55.51 |
+29:44:37.6 |
HIP 36815 |
28.11 |
| 2026-05-27 12:00 |
07:33:11.08 |
+29:46:40.2 |
HIP 36815 |
27.78 |
| 2026-05-28 00:00 |
07:33:26.75 |
+29:48:42.2 |
HIP 36815 |
27.99 |
| 2026-05-28 12:00 |
07:33:42.54 |
+29:50:43.7 |
HIP 36815 |
28.74 |
| 2026-05-29 00:00 |
07:33:58.43 |
+29:52:44.7 |
HIP 36815 |
29.99 |
| 2026-05-29 12:00 |
07:34:14.43 |
+29:54:45.1 |
HIP 36815 |
31.69 |
| 2026-05-30 00:00 |
07:34:30.54 |
+29:56:45.0 |
HIP 37035 |
29.55 |
| 2026-05-30 12:00 |
07:34:46.75 |
+29:58:44.4 |
HIP 37035 |
27.07 |
| 2026-05-31 00:00 |
07:35:03.06 |
+30:00:43.4 |
HIP 37035 |
24.98 |
| 2026-05-31 12:00 |
07:35:19.48 |
+30:02:41.8 |
HIP 37071 |
22.89 |
| 2026-06-01 00:00 |
07:35:36.00 |
+30:04:39.7 |
HIP 37071 |
19.61 |
| 2026-06-01 12:00 |
07:35:52.62 |
+30:06:37.1 |
HIP 37071 |
16.65 |
| 2026-06-02 00:00 |
07:36:09.34 |
+30:08:34.1 |
HIP 37071 |
14.26 |