| Parameter |
Value |
| Designation |
P/2020 X1 (ATLAS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2020-07-20T02:53:09.418560Z |
| Orbit solution date (soln_date, UTC) |
2024-04-16T14:26:07Z |
| Obs used |
96 |
| NEO |
- |
| M1 |
7.300 |
| K1 |
21.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2020-12-04T10:41:02.601600Z |
| Discovery magnitude (MPC) |
18.92 o |
| Discovery observatory (MPC) |
T05 · ATLAS-HKO, Haleakala |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2021-01-23.0000000 |
| e |
0.36528017 |
| q (au) |
2.871814 |
| a (au) |
4.524538 |
| i (deg) |
31.703026 |
| Ω (om, deg) |
56.028268 |
| ω (w, deg) |
323.208571 |
| M (ma, deg) |
19.138368 |
Magnitude
Scatter + Global Linear
$$
M_a = (15.087 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
15.087 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
0.800 |
| 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 |
14:38:58.94 |
-03:50:49.0 |
HIP 71589 |
16.01 |
| 2026-05-12 12:00 |
14:38:42.11 |
-03:50:41.4 |
HIP 71589 |
14.40 |
| 2026-05-13 00:00 |
14:38:25.33 |
-03:50:34.5 |
HIP 71589 |
13.94 |
| 2026-05-13 12:00 |
14:38:08.58 |
-03:50:28.3 |
HIP 71589 |
14.72 |
| 2026-05-14 00:00 |
14:37:51.87 |
-03:50:22.9 |
HIP 71486 |
11.23 |
| 2026-05-14 12:00 |
14:37:35.21 |
-03:50:18.2 |
HIP 71486 |
7.37 |
| 2026-05-15 00:00 |
14:37:18.59 |
-03:50:14.2 |
HIP 71486 |
4.12 |
| 2026-05-15 12:00 |
14:37:02.03 |
-03:50:11.0 |
HIP 71486 |
3.73 |
| 2026-05-16 00:00 |
14:36:45.51 |
-03:50:08.5 |
HIP 71486 |
6.69 |
| 2026-05-16 12:00 |
14:36:29.05 |
-03:50:06.8 |
HIP 71410 |
5.65 |
| 2026-05-17 00:00 |
14:36:12.64 |
-03:50:05.9 |
HIP 71410 |
3.28 |
| 2026-05-17 12:00 |
14:35:56.29 |
-03:50:05.7 |
HIP 71410 |
4.80 |
| 2026-05-18 00:00 |
14:35:40.00 |
-03:50:06.3 |
HIP 71410 |
8.27 |
| 2026-05-18 12:00 |
14:35:23.78 |
-03:50:07.8 |
HIP 71410 |
12.11 |
| 2026-05-19 00:00 |
14:35:07.61 |
-03:50:09.9 |
HIP 71410 |
16.03 |
| 2026-05-19 12:00 |
14:34:51.52 |
-03:50:12.9 |
HIP 71410 |
19.99 |
| 2026-05-20 00:00 |
14:34:35.49 |
-03:50:16.7 |
HIP 71173 |
18.50 |
| 2026-05-20 12:00 |
14:34:19.54 |
-03:50:21.3 |
HIP 71173 |
14.71 |
| 2026-05-21 00:00 |
14:34:03.66 |
-03:50:26.7 |
HIP 71173 |
11.07 |
| 2026-05-21 12:00 |
14:33:47.85 |
-03:50:32.9 |
HIP 71173 |
7.77 |
| 2026-05-22 00:00 |
14:33:32.12 |
-03:50:39.9 |
HIP 71173 |
5.44 |
| 2026-05-22 12:00 |
14:33:16.48 |
-03:50:47.8 |
HIP 71173 |
5.45 |
| 2026-05-23 00:00 |
14:33:00.91 |
-03:50:56.4 |
HIP 71173 |
7.76 |
| 2026-05-23 12:00 |
14:32:45.42 |
-03:51:05.9 |
HIP 71173 |
10.99 |
| 2026-05-24 00:00 |
14:32:30.02 |
-03:51:16.2 |
HIP 71173 |
14.51 |
| 2026-05-24 12:00 |
14:32:14.71 |
-03:51:27.4 |
HIP 71173 |
18.16 |
| 2026-05-25 00:00 |
14:31:59.48 |
-03:51:39.3 |
HIP 71173 |
21.84 |
| 2026-05-25 12:00 |
14:31:44.35 |
-03:51:52.1 |
HIP 70937 |
21.99 |
| 2026-05-26 00:00 |
14:31:29.31 |
-03:52:05.8 |
HIP 70937 |
18.82 |
| 2026-05-26 12:00 |
14:31:14.36 |
-03:52:20.3 |
HIP 70937 |
15.91 |
| 2026-05-27 00:00 |
14:30:59.51 |
-03:52:35.6 |
HIP 70937 |
13.42 |
| 2026-05-27 12:00 |
14:30:44.75 |
-03:52:51.8 |
HIP 70937 |
11.60 |
| 2026-05-28 00:00 |
14:30:30.09 |
-03:53:08.8 |
HIP 70937 |
10.76 |
| 2026-05-28 12:00 |
14:30:15.54 |
-03:53:26.7 |
HIP 70937 |
11.12 |
| 2026-05-29 00:00 |
14:30:01.08 |
-03:53:45.4 |
HIP 70937 |
12.54 |
| 2026-05-29 12:00 |
14:29:46.73 |
-03:54:05.0 |
HIP 70937 |
14.70 |
| 2026-05-30 00:00 |
14:29:32.49 |
-03:54:25.4 |
HIP 70937 |
17.31 |
| 2026-05-30 12:00 |
14:29:18.35 |
-03:54:46.7 |
HIP 70937 |
20.19 |
| 2026-05-31 00:00 |
14:29:04.32 |
-03:55:08.8 |
HIP 70937 |
23.22 |
| 2026-05-31 12:00 |
14:28:50.39 |
-03:55:31.8 |
HIP 70906 |
25.99 |
| 2026-06-01 00:00 |
14:28:36.58 |
-03:55:55.7 |
HIP 70906 |
28.14 |
| 2026-06-01 12:00 |
14:28:22.89 |
-03:56:20.4 |
HIP 70906 |
30.51 |
| 2026-06-02 00:00 |
14:28:09.30 |
-03:56:46.0 |
HIP 70906 |
33.03 |