| Parameter |
Value |
| Designation |
P/2020 S7 (PANSTARRS) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2020-11-18T00:51:10.647360Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:34:12Z |
| Obs used |
126 |
| NEO |
- |
| M1 |
14.600 |
| K1 |
10.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2020-09-16T08:31:24.960000Z |
| Discovery magnitude (MPC) |
20.80 w |
| Discovery observatory (MPC) |
F51 · Pan-STARRS 1, Haleakala |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2020-09-29.0000000 |
| e |
0.41057912 |
| q (au) |
2.961017 |
| a (au) |
5.023604 |
| i (deg) |
16.091824 |
| Ω (om, deg) |
328.018227 |
| ω (w, deg) |
40.397306 |
| M (ma, deg) |
355.620147 |
Magnitude
Scatter + Global Linear
$$
M_a = (11.245 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
11.245 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.500 |
| 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) |
| 2026-05-12 00:00 |
11:37:14.92 |
-09:23:02.5 |
HIP 56631 |
9.46 |
| 2026-05-12 12:00 |
11:37:09.85 |
-09:22:06.2 |
HIP 56631 |
7.93 |
| 2026-05-13 00:00 |
11:37:04.91 |
-09:21:10.6 |
HIP 56631 |
6.44 |
| 2026-05-13 12:00 |
11:37:00.10 |
-09:20:15.5 |
HIP 56631 |
5.01 |
| 2026-05-14 00:00 |
11:36:55.42 |
-09:19:21.1 |
HIP 56631 |
3.68 |
| 2026-05-14 12:00 |
11:36:50.87 |
-09:18:27.3 |
HIP 56631 |
2.54 |
| 2026-05-15 00:00 |
11:36:46.46 |
-09:17:34.2 |
HIP 56631 |
1.87 |
| 2026-05-15 12:00 |
11:36:42.18 |
-09:16:41.7 |
HIP 56631 |
2.12 |
| 2026-05-16 00:00 |
11:36:38.04 |
-09:15:49.8 |
HIP 56631 |
3.02 |
| 2026-05-16 12:00 |
11:36:34.03 |
-09:14:58.6 |
HIP 56631 |
4.14 |
| 2026-05-17 00:00 |
11:36:30.15 |
-09:14:08.1 |
HIP 56631 |
5.32 |
| 2026-05-17 12:00 |
11:36:26.41 |
-09:13:18.2 |
HIP 56631 |
6.51 |
| 2026-05-18 00:00 |
11:36:22.80 |
-09:12:29.0 |
HIP 56631 |
7.69 |
| 2026-05-18 12:00 |
11:36:19.33 |
-09:11:40.5 |
HIP 56631 |
8.85 |
| 2026-05-19 00:00 |
11:36:15.99 |
-09:10:52.7 |
HIP 56631 |
9.98 |
| 2026-05-19 12:00 |
11:36:12.79 |
-09:10:05.6 |
HIP 56631 |
11.08 |
| 2026-05-20 00:00 |
11:36:09.72 |
-09:09:19.2 |
HIP 56631 |
12.16 |
| 2026-05-20 12:00 |
11:36:06.79 |
-09:08:33.5 |
HIP 56631 |
13.21 |
| 2026-05-21 00:00 |
11:36:03.99 |
-09:07:48.5 |
HIP 56631 |
14.23 |
| 2026-05-21 12:00 |
11:36:01.33 |
-09:07:04.3 |
HIP 56517 |
15.02 |
| 2026-05-22 00:00 |
11:35:58.80 |
-09:06:20.7 |
HIP 56517 |
15.00 |
| 2026-05-22 12:00 |
11:35:56.41 |
-09:05:37.9 |
HIP 56517 |
15.06 |
| 2026-05-23 00:00 |
11:35:54.15 |
-09:04:55.8 |
HIP 56517 |
15.19 |
| 2026-05-23 12:00 |
11:35:52.03 |
-09:04:14.5 |
HIP 56517 |
15.38 |
| 2026-05-24 00:00 |
11:35:50.04 |
-09:03:33.8 |
HIP 56517 |
15.63 |
| 2026-05-24 12:00 |
11:35:48.19 |
-09:02:54.0 |
HIP 56517 |
15.92 |
| 2026-05-25 00:00 |
11:35:46.47 |
-09:02:14.8 |
HIP 56517 |
16.25 |
| 2026-05-25 12:00 |
11:35:44.88 |
-09:01:36.4 |
HIP 56517 |
16.62 |
| 2026-05-26 00:00 |
11:35:43.43 |
-09:00:58.8 |
HIP 56517 |
17.02 |
| 2026-05-26 12:00 |
11:35:42.12 |
-09:00:21.9 |
HIP 56517 |
17.44 |
| 2026-05-27 00:00 |
11:35:40.93 |
-08:59:45.8 |
HIP 56517 |
17.88 |
| 2026-05-27 12:00 |
11:35:39.89 |
-08:59:10.5 |
HIP 56643 |
18.21 |
| 2026-05-28 00:00 |
11:35:38.97 |
-08:58:35.9 |
HIP 56643 |
18.32 |
| 2026-05-28 12:00 |
11:35:38.19 |
-08:58:02.0 |
HIP 56643 |
18.41 |
| 2026-05-29 00:00 |
11:35:37.54 |
-08:57:29.0 |
HIP 56643 |
18.50 |
| 2026-05-29 12:00 |
11:35:37.02 |
-08:56:56.7 |
HIP 56643 |
18.57 |
| 2026-05-30 00:00 |
11:35:36.64 |
-08:56:25.2 |
HIP 56643 |
18.63 |
| 2026-05-30 12:00 |
11:35:36.39 |
-08:55:54.5 |
HIP 56643 |
18.66 |
| 2026-05-31 00:00 |
11:35:36.27 |
-08:55:24.5 |
HIP 56643 |
18.68 |
| 2026-05-31 12:00 |
11:35:36.29 |
-08:54:55.4 |
HIP 56643 |
18.68 |
| 2026-06-01 00:00 |
11:35:36.43 |
-08:54:27.0 |
HIP 56643 |
18.66 |
| 2026-06-01 12:00 |
11:35:36.71 |
-08:53:59.4 |
HIP 56643 |
18.62 |
| 2026-06-02 00:00 |
11:35:37.12 |
-08:53:32.6 |
HIP 56643 |
18.56 |