C/2024 X2 (ATLAS)
| Parameter |
Value |
| Designation |
C/2024 X2 (ATLAS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2025-07-07T20:38:41.141760Z |
| Orbit solution date (soln_date, UTC) |
2026-01-13T08:12:18Z |
| Obs used |
390 |
| NEO |
- |
| M1 |
6.700 |
| 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) |
2025-04-30.0000000 |
| e |
0.92726929 |
| q (au) |
3.676331 |
| a (au) |
50.547167 |
| i (deg) |
109.221098 |
| Ω (om, deg) |
122.522866 |
| ω (w, deg) |
315.777604 |
| M (ma, deg) |
359.811146 |
Magnitude
Scatter + Global Linear
$$
M_a = (5.339 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
5.339 |
| n |
6.000 |
| gf |
0.999 |
| gb |
-0.520 |
| 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) |
| 2026-02-03 00:00 |
08:08:41.77 |
+12:11:05.0 |
HIP 39740 |
20.14 |
| 2026-02-03 12:00 |
08:08:02.09 |
+12:19:28.9 |
HIP 39740 |
12.48 |
| 2026-02-04 00:00 |
08:07:22.54 |
+12:27:51.7 |
HIP 39740 |
15.30 |
| 2026-02-04 12:00 |
08:06:43.12 |
+12:36:13.4 |
HIP 39740 |
25.27 |
| 2026-02-05 00:00 |
08:06:03.84 |
+12:44:33.8 |
HIP 39567 |
26.78 |
| 2026-02-05 12:00 |
08:05:24.72 |
+12:52:52.9 |
HIP 39567 |
15.05 |
| 2026-02-06 00:00 |
08:04:45.74 |
+13:01:10.7 |
HIP 39567 |
7.48 |
| 2026-02-06 12:00 |
08:04:06.92 |
+13:09:27.1 |
HIP 39567 |
14.22 |
| 2026-02-07 00:00 |
08:03:28.27 |
+13:17:42.0 |
HIP 39412 |
22.47 |
| 2026-02-07 12:00 |
08:02:49.79 |
+13:25:55.5 |
HIP 39412 |
16.55 |
| 2026-02-08 00:00 |
08:02:11.48 |
+13:34:07.5 |
HIP 39412 |
18.76 |
| 2026-02-08 12:00 |
08:01:33.35 |
+13:42:17.9 |
HIP 39127 |
19.67 |
| 2026-02-09 00:00 |
08:00:55.40 |
+13:50:26.6 |
HIP 39127 |
10.01 |
| 2026-02-09 12:00 |
08:00:17.65 |
+13:58:33.7 |
HIP 39127 |
10.76 |
| 2026-02-10 00:00 |
07:59:40.09 |
+14:06:39.1 |
HIP 39127 |
20.72 |
| 2026-02-10 12:00 |
07:59:02.73 |
+14:14:42.8 |
HIP 39127 |
32.19 |
| 2026-02-11 00:00 |
07:58:25.58 |
+14:22:44.6 |
HIP 38819 |
25.25 |
| 2026-02-11 12:00 |
07:57:48.63 |
+14:30:44.6 |
HIP 38819 |
19.15 |
| 2026-02-12 00:00 |
07:57:11.91 |
+14:38:42.7 |
HIP 38819 |
19.59 |
| 2026-02-12 12:00 |
07:56:35.40 |
+14:46:38.9 |
HIP 38837 |
12.07 |
| 2026-02-13 00:00 |
07:55:59.11 |
+14:54:33.1 |
HIP 38837 |
13.39 |
| 2026-02-13 12:00 |
07:55:23.06 |
+15:02:25.4 |
HIP 38837 |
22.10 |
| 2026-02-14 00:00 |
07:54:47.24 |
+15:10:15.6 |
HIP 38638 |
15.92 |
| 2026-02-14 12:00 |
07:54:11.66 |
+15:18:03.8 |
HIP 38638 |
10.89 |
| 2026-02-15 00:00 |
07:53:36.32 |
+15:25:49.9 |
HIP 38503 |
8.11 |
| 2026-02-15 12:00 |
07:53:01.23 |
+15:33:33.8 |
HIP 38517 |
4.28 |
| 2026-02-16 00:00 |
07:52:26.39 |
+15:41:15.6 |
HIP 38519 |
12.64 |
| 2026-02-16 12:00 |
07:51:51.80 |
+15:48:55.2 |
HIP 38288 |
19.17 |
| 2026-02-17 00:00 |
07:51:17.47 |
+15:56:32.5 |
HIP 38288 |
9.02 |
| 2026-02-17 12:00 |
07:50:43.41 |
+16:04:07.6 |
HIP 38284 |
6.15 |
| 2026-02-18 00:00 |
07:50:09.61 |
+16:11:40.5 |
HIP 38284 |
15.23 |
| 2026-02-18 12:00 |
07:49:36.09 |
+16:19:11.0 |
HIP 38284 |
25.85 |
| 2026-02-19 00:00 |
07:49:02.83 |
+16:26:39.2 |
HIP 38281 |
34.31 |
| 2026-02-19 12:00 |
07:48:29.86 |
+16:34:05.1 |
HIP 37947 |
26.88 |
| 2026-02-20 00:00 |
07:47:57.17 |
+16:41:28.6 |
HIP 37947 |
18.78 |
| 2026-02-20 12:00 |
07:47:24.76 |
+16:48:49.7 |
HIP 37947 |
14.69 |
| 2026-02-21 00:00 |
07:46:52.64 |
+16:56:08.4 |
HIP 37922 |
9.86 |
| 2026-02-21 12:00 |
07:46:20.81 |
+17:03:24.6 |
HIP 37922 |
2.76 |
| 2026-02-22 00:00 |
07:45:49.27 |
+17:10:38.4 |
HIP 37922 |
11.74 |
| 2026-02-22 12:00 |
07:45:18.03 |
+17:17:49.7 |
HIP 37759 |
14.58 |
| 2026-02-23 00:00 |
07:44:47.09 |
+17:24:58.6 |
HIP 37759 |
4.38 |
| 2026-02-23 12:00 |
07:44:16.45 |
+17:32:04.9 |
HIP 37759 |
6.00 |
| 2026-02-24 00:00 |
07:43:46.11 |
+17:39:08.8 |
HIP 37759 |
16.05 |