| 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) |
| 2026-03-26 00:00 |
15:02:45.71 |
-04:35:41.5 |
HIP 73601 |
2.33 |
| 2026-03-26 12:00 |
15:02:35.11 |
-04:35:06.1 |
HIP 73601 |
1.72 |
| 2026-03-27 00:00 |
15:02:24.36 |
-04:34:30.5 |
HIP 73601 |
3.93 |
| 2026-03-27 12:00 |
15:02:13.46 |
-04:33:54.8 |
HIP 73601 |
6.59 |
| 2026-03-28 00:00 |
15:02:02.42 |
-04:33:19.0 |
HIP 73601 |
9.36 |
| 2026-03-28 12:00 |
15:01:51.23 |
-04:32:43.0 |
HIP 73601 |
12.19 |
| 2026-03-29 00:00 |
15:01:39.90 |
-04:32:07.0 |
HIP 73465 |
12.59 |
| 2026-03-29 12:00 |
15:01:28.43 |
-04:31:30.8 |
HIP 73465 |
9.73 |
| 2026-03-30 00:00 |
15:01:16.82 |
-04:30:54.5 |
HIP 73465 |
6.89 |
| 2026-03-30 12:00 |
15:01:05.06 |
-04:30:18.2 |
HIP 73465 |
4.19 |
| 2026-03-31 00:00 |
15:00:53.17 |
-04:29:41.8 |
HIP 73465 |
2.36 |
| 2026-03-31 12:00 |
15:00:41.15 |
-04:29:05.3 |
HIP 73465 |
3.47 |
| 2026-04-01 00:00 |
15:00:28.98 |
-04:28:28.8 |
HIP 73465 |
6.14 |
| 2026-04-01 12:00 |
15:00:16.68 |
-04:27:52.2 |
HIP 73465 |
9.11 |
| 2026-04-02 00:00 |
15:00:04.25 |
-04:27:15.5 |
HIP 73465 |
12.19 |
| 2026-04-02 12:00 |
14:59:51.69 |
-04:26:38.9 |
HIP 73465 |
15.34 |
| 2026-04-03 00:00 |
14:59:39.00 |
-04:26:02.2 |
HIP 73465 |
18.53 |
| 2026-04-03 12:00 |
14:59:26.18 |
-04:25:25.5 |
HIP 73465 |
21.77 |
| 2026-04-04 00:00 |
14:59:13.23 |
-04:24:48.8 |
HIP 73465 |
25.04 |
| 2026-04-04 12:00 |
14:59:00.15 |
-04:24:12.1 |
HIP 73165 |
27.41 |
| 2026-04-05 00:00 |
14:58:46.95 |
-04:23:35.4 |
HIP 73165 |
24.07 |
| 2026-04-05 12:00 |
14:58:33.63 |
-04:22:58.8 |
HIP 73165 |
20.70 |
| 2026-04-06 00:00 |
14:58:20.18 |
-04:22:22.1 |
HIP 73165 |
17.31 |
| 2026-04-06 12:00 |
14:58:06.62 |
-04:21:45.6 |
HIP 73165 |
13.89 |
| 2026-04-07 00:00 |
14:57:52.93 |
-04:21:09.0 |
HIP 73165 |
10.45 |
| 2026-04-07 12:00 |
14:57:39.13 |
-04:20:32.6 |
HIP 73165 |
7.00 |
| 2026-04-08 00:00 |
14:57:25.21 |
-04:19:56.2 |
HIP 73165 |
3.63 |
| 2026-04-08 12:00 |
14:57:11.18 |
-04:19:19.9 |
HIP 73165 |
1.43 |
| 2026-04-09 00:00 |
14:56:57.04 |
-04:18:43.7 |
HIP 73165 |
4.04 |
| 2026-04-09 12:00 |
14:56:42.79 |
-04:18:07.6 |
HIP 73165 |
7.53 |
| 2026-04-10 00:00 |
14:56:28.42 |
-04:17:31.6 |
HIP 73165 |
11.11 |
| 2026-04-10 12:00 |
14:56:13.95 |
-04:16:55.7 |
HIP 73165 |
14.74 |
| 2026-04-11 00:00 |
14:55:59.38 |
-04:16:19.9 |
HIP 73014 |
12.03 |
| 2026-04-11 12:00 |
14:55:44.70 |
-04:15:44.3 |
HIP 73014 |
9.45 |
| 2026-04-12 00:00 |
14:55:29.92 |
-04:15:08.9 |
HIP 73014 |
7.82 |
| 2026-04-12 12:00 |
14:55:15.04 |
-04:14:33.6 |
HIP 73014 |
7.80 |
| 2026-04-13 00:00 |
14:55:00.06 |
-04:13:58.5 |
HIP 73014 |
9.43 |
| 2026-04-13 12:00 |
14:54:44.98 |
-04:13:23.6 |
HIP 73014 |
12.08 |
| 2026-04-14 00:00 |
14:54:29.82 |
-04:12:48.9 |
HIP 73014 |
15.24 |
| 2026-04-14 12:00 |
14:54:14.56 |
-04:12:14.4 |
HIP 73014 |
18.67 |
| 2026-04-15 00:00 |
14:53:59.21 |
-04:11:40.1 |
HIP 73014 |
22.25 |
| 2026-04-15 12:00 |
14:53:43.77 |
-04:11:06.0 |
HIP 72739 |
24.16 |
| 2026-04-16 00:00 |
14:53:28.24 |
-04:10:32.2 |
HIP 72739 |
20.44 |