| 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
$$
M_a = (5.562 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
5.562 |
| 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) |
| 2026-06-01 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 |
| 2026-06-02 12:00 |
07:36:26.16 |
+30:10:30.6 |
HIP 37071 |
12.75 |
| 2026-06-03 00:00 |
07:36:43.07 |
+30:12:26.6 |
HIP 37071 |
12.46 |
| 2026-06-03 12:00 |
07:37:00.09 |
+30:14:22.2 |
HIP 37071 |
13.50 |
| 2026-06-04 00:00 |
07:37:17.19 |
+30:16:17.4 |
HIP 37071 |
15.61 |
| 2026-06-04 12:00 |
07:37:34.39 |
+30:18:12.1 |
HIP 37071 |
18.43 |
| 2026-06-05 00:00 |
07:37:51.68 |
+30:20:06.4 |
HIP 37071 |
21.69 |
| 2026-06-05 12:00 |
07:38:09.07 |
+30:22:00.2 |
HIP 37176 |
19.88 |
| 2026-06-06 00:00 |
07:38:26.54 |
+30:23:53.7 |
HIP 37176 |
17.93 |
| 2026-06-06 12:00 |
07:38:44.11 |
+30:25:46.7 |
HIP 37176 |
16.85 |
| 2026-06-07 00:00 |
07:39:01.76 |
+30:27:39.3 |
HIP 37176 |
16.80 |
| 2026-06-07 12:00 |
07:39:19.50 |
+30:29:31.6 |
HIP 37176 |
17.81 |
| 2026-06-08 00:00 |
07:39:37.33 |
+30:31:23.4 |
HIP 37176 |
19.73 |
| 2026-06-08 12:00 |
07:39:55.24 |
+30:33:14.9 |
HIP 37456 |
17.94 |
| 2026-06-09 00:00 |
07:40:13.24 |
+30:35:05.9 |
HIP 37456 |
14.17 |
| 2026-06-09 12:00 |
07:40:31.32 |
+30:36:56.7 |
HIP 37456 |
10.79 |
| 2026-06-10 00:00 |
07:40:49.48 |
+30:38:47.0 |
HIP 37456 |
8.31 |
| 2026-06-10 12:00 |
07:41:07.73 |
+30:40:37.0 |
HIP 37456 |
7.66 |
| 2026-06-11 00:00 |
07:41:26.05 |
+30:42:26.7 |
HIP 37456 |
9.26 |
| 2026-06-11 12:00 |
07:41:44.46 |
+30:44:16.0 |
HIP 37456 |
12.28 |
| 2026-06-12 00:00 |
07:42:02.94 |
+30:46:05.0 |
HIP 37456 |
15.93 |
| 2026-06-12 12:00 |
07:42:21.50 |
+30:47:53.7 |
HIP 37456 |
19.88 |
| 2026-06-13 00:00 |
07:42:40.14 |
+30:49:42.0 |
HIP 37456 |
23.99 |
| 2026-06-13 12:00 |
07:42:58.85 |
+30:51:30.0 |
HIP 37559 |
23.51 |
| 2026-06-14 00:00 |
07:43:17.63 |
+30:53:17.8 |
HIP 37761 |
21.93 |
| 2026-06-14 12:00 |
07:43:36.49 |
+30:55:05.2 |
HIP 37761 |
17.67 |
| 2026-06-15 00:00 |
07:43:55.42 |
+30:56:52.4 |
HIP 37761 |
13.52 |
| 2026-06-15 12:00 |
07:44:14.42 |
+30:58:39.3 |
HIP 37761 |
9.63 |
| 2026-06-16 00:00 |
07:44:33.49 |
+31:00:25.9 |
HIP 37761 |
6.48 |
| 2026-06-16 12:00 |
07:44:52.63 |
+31:02:12.2 |
HIP 37761 |
5.58 |
| 2026-06-17 00:00 |
07:45:11.83 |
+31:03:58.3 |
HIP 37761 |
7.77 |
| 2026-06-17 12:00 |
07:45:31.10 |
+31:05:44.1 |
HIP 37761 |
11.40 |
| 2026-06-18 00:00 |
07:45:50.43 |
+31:07:29.7 |
HIP 37761 |
15.49 |
| 2026-06-18 12:00 |
07:46:09.83 |
+31:09:15.1 |
HIP 37761 |
19.77 |
| 2026-06-19 00:00 |
07:46:29.29 |
+31:11:00.2 |
HIP 37761 |
24.15 |
| 2026-06-19 12:00 |
07:46:48.80 |
+31:12:45.2 |
HIP 37761 |
28.58 |
| 2026-06-20 00:00 |
07:47:08.38 |
+31:14:29.9 |
HIP 38122 |
28.61 |
| 2026-06-20 12:00 |
07:47:28.02 |
+31:16:14.4 |
HIP 38122 |
27.12 |
| 2026-06-21 00:00 |
07:47:47.72 |
+31:17:58.7 |
HIP 38122 |
26.34 |
| 2026-06-21 12:00 |
07:48:07.47 |
+31:19:42.8 |
HIP 38122 |
26.33 |
| 2026-06-22 00:00 |
07:48:27.28 |
+31:21:26.7 |
HIP 38122 |
27.09 |