| Parameter |
Value |
| Designation |
C/2020 X2 (ATLAS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2020-11-15T21:24:26.968320Z |
| Orbit solution date (soln_date, UTC) |
2024-01-04T23:42:39Z |
| Obs used |
253 |
| NEO |
- |
| M1 |
7.000 |
| K1 |
16.250 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2020-12-10T12:05:53.462400Z |
| Discovery magnitude (MPC) |
18.27 o |
| Discovery observatory (MPC) |
T08 · ATLAS-MLO, Mauna Loa |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2020-12-19.0000000 |
| e |
0.76624465 |
| q (au) |
3.828504 |
| a (au) |
16.378251 |
| i (deg) |
18.191452 |
| Ω (om, deg) |
105.458856 |
| ω (w, deg) |
347.357421 |
| M (ma, deg) |
0.492307 |
Magnitude
Scatter + Global Linear
$$
M_a = (7.671 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
7.671 |
| n |
6.000 |
| gf |
0.993 |
| gb |
-0.845 |
| k |
0.998 |
| δ90 |
1.012 |
| 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) |
| 2026-07-29 00:00 |
14:38:53.00 |
+01:53:11.9 |
HIP 71575 |
12.50 |
| 2026-07-29 12:00 |
14:38:53.98 |
+01:52:22.1 |
HIP 71575 |
13.24 |
| 2026-07-30 00:00 |
14:38:55.03 |
+01:51:32.0 |
HIP 71575 |
14.02 |
| 2026-07-30 12:00 |
14:38:56.16 |
+01:50:41.6 |
HIP 71575 |
14.82 |
| 2026-07-31 00:00 |
14:38:57.35 |
+01:49:50.9 |
HIP 71575 |
15.65 |
| 2026-07-31 12:00 |
14:38:58.62 |
+01:49:00.0 |
HIP 71575 |
16.50 |
| 2026-08-01 00:00 |
14:38:59.96 |
+01:48:08.7 |
HIP 71575 |
17.37 |
| 2026-08-01 12:00 |
14:39:01.37 |
+01:47:17.2 |
HIP 71575 |
18.26 |
| 2026-08-02 00:00 |
14:39:02.85 |
+01:46:25.4 |
HIP 71575 |
19.17 |
| 2026-08-02 12:00 |
14:39:04.40 |
+01:45:33.3 |
HIP 71575 |
20.09 |
| 2026-08-03 00:00 |
14:39:06.02 |
+01:44:41.0 |
HIP 71575 |
21.03 |
| 2026-08-03 12:00 |
14:39:07.72 |
+01:43:48.4 |
HIP 71575 |
21.99 |
| 2026-08-04 00:00 |
14:39:09.48 |
+01:42:55.5 |
HIP 71663 |
22.43 |
| 2026-08-04 12:00 |
14:39:11.32 |
+01:42:02.4 |
HIP 71663 |
21.47 |
| 2026-08-05 00:00 |
14:39:13.22 |
+01:41:09.0 |
HIP 71663 |
20.50 |
| 2026-08-05 12:00 |
14:39:15.20 |
+01:40:15.3 |
HIP 71663 |
19.54 |
| 2026-08-06 00:00 |
14:39:17.24 |
+01:39:21.4 |
HIP 71663 |
18.57 |
| 2026-08-06 12:00 |
14:39:19.36 |
+01:38:27.2 |
HIP 71663 |
17.61 |
| 2026-08-07 00:00 |
14:39:21.55 |
+01:37:32.8 |
HIP 71663 |
16.65 |
| 2026-08-07 12:00 |
14:39:23.80 |
+01:36:38.1 |
HIP 71663 |
15.69 |
| 2026-08-08 00:00 |
14:39:26.13 |
+01:35:43.2 |
HIP 71663 |
14.75 |
| 2026-08-08 12:00 |
14:39:28.53 |
+01:34:48.1 |
HIP 71663 |
13.82 |
| 2026-08-09 00:00 |
14:39:30.99 |
+01:33:52.7 |
HIP 71663 |
12.92 |
| 2026-08-09 12:00 |
14:39:33.53 |
+01:32:57.1 |
HIP 71663 |
12.05 |
| 2026-08-10 00:00 |
14:39:36.13 |
+01:32:01.3 |
HIP 71663 |
11.23 |
| 2026-08-10 12:00 |
14:39:38.81 |
+01:31:05.2 |
HIP 71663 |
10.47 |
| 2026-08-11 00:00 |
14:39:41.55 |
+01:30:09.0 |
HIP 71663 |
9.78 |
| 2026-08-11 12:00 |
14:39:44.36 |
+01:29:12.5 |
HIP 71663 |
9.19 |
| 2026-08-12 00:00 |
14:39:47.24 |
+01:28:15.7 |
HIP 71663 |
8.74 |
| 2026-08-12 12:00 |
14:39:50.19 |
+01:27:18.8 |
HIP 71663 |
8.43 |
| 2026-08-13 00:00 |
14:39:53.21 |
+01:26:21.7 |
HIP 71663 |
8.30 |
| 2026-08-13 12:00 |
14:39:56.29 |
+01:25:24.4 |
HIP 71663 |
8.35 |
| 2026-08-14 00:00 |
14:39:59.44 |
+01:24:26.8 |
HIP 71663 |
8.60 |
| 2026-08-14 12:00 |
14:40:02.66 |
+01:23:29.1 |
HIP 71663 |
9.03 |
| 2026-08-15 00:00 |
14:40:05.95 |
+01:22:31.2 |
HIP 71663 |
9.62 |
| 2026-08-15 12:00 |
14:40:09.31 |
+01:21:33.1 |
HIP 71663 |
10.35 |
| 2026-08-16 00:00 |
14:40:12.73 |
+01:20:34.8 |
HIP 71663 |
11.20 |
| 2026-08-16 12:00 |
14:40:16.22 |
+01:19:36.3 |
HIP 71663 |
12.14 |
| 2026-08-17 00:00 |
14:40:19.77 |
+01:18:37.7 |
HIP 71663 |
13.16 |
| 2026-08-17 12:00 |
14:40:23.39 |
+01:17:38.8 |
HIP 71663 |
14.25 |
| 2026-08-18 00:00 |
14:40:27.08 |
+01:16:39.8 |
HIP 71663 |
15.40 |
| 2026-08-18 12:00 |
14:40:30.83 |
+01:15:40.7 |
HIP 71663 |
16.59 |
| 2026-08-19 00:00 |
14:40:34.65 |
+01:14:41.4 |
HIP 71663 |
17.82 |