P/2020 S7 (PANSTARRS)
| 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) |
| 2026-02-03 00:00 |
12:12:47.87 |
-12:06:20.4 |
HIP 59410 |
22.86 |
| 2026-02-03 12:00 |
12:12:40.95 |
-12:06:36.3 |
HIP 59410 |
21.18 |
| 2026-02-04 00:00 |
12:12:33.90 |
-12:06:51.4 |
HIP 59410 |
19.47 |
| 2026-02-04 12:00 |
12:12:26.72 |
-12:07:05.4 |
HIP 59410 |
17.73 |
| 2026-02-05 00:00 |
12:12:19.42 |
-12:07:18.4 |
HIP 59410 |
15.97 |
| 2026-02-05 12:00 |
12:12:11.99 |
-12:07:30.4 |
HIP 59410 |
14.18 |
| 2026-02-06 00:00 |
12:12:04.43 |
-12:07:41.4 |
HIP 59410 |
12.38 |
| 2026-02-06 12:00 |
12:11:56.75 |
-12:07:51.5 |
HIP 59410 |
10.55 |
| 2026-02-07 00:00 |
12:11:48.94 |
-12:08:00.5 |
HIP 59410 |
8.73 |
| 2026-02-07 12:00 |
12:11:41.00 |
-12:08:08.5 |
HIP 59410 |
6.91 |
| 2026-02-08 00:00 |
12:11:32.95 |
-12:08:15.6 |
HIP 59410 |
5.15 |
| 2026-02-08 12:00 |
12:11:24.77 |
-12:08:21.6 |
HIP 59410 |
3.59 |
| 2026-02-09 00:00 |
12:11:16.46 |
-12:08:26.7 |
HIP 59410 |
2.67 |
| 2026-02-09 12:00 |
12:11:08.04 |
-12:08:30.7 |
HIP 59410 |
3.10 |
| 2026-02-10 00:00 |
12:10:59.50 |
-12:08:33.7 |
HIP 59410 |
4.55 |
| 2026-02-10 12:00 |
12:10:50.83 |
-12:08:35.7 |
HIP 59410 |
6.38 |
| 2026-02-11 00:00 |
12:10:42.05 |
-12:08:36.8 |
HIP 59410 |
8.38 |
| 2026-02-11 12:00 |
12:10:33.15 |
-12:08:36.8 |
HIP 59410 |
10.45 |
| 2026-02-12 00:00 |
12:10:24.14 |
-12:08:35.8 |
HIP 59410 |
12.59 |
| 2026-02-12 12:00 |
12:10:15.01 |
-12:08:33.8 |
HIP 59410 |
14.77 |
| 2026-02-13 00:00 |
12:10:05.76 |
-12:08:30.8 |
HIP 59410 |
16.98 |
| 2026-02-13 12:00 |
12:09:56.40 |
-12:08:26.8 |
HIP 59272 |
18.38 |
| 2026-02-14 00:00 |
12:09:46.93 |
-12:08:21.8 |
HIP 59272 |
17.56 |
| 2026-02-14 12:00 |
12:09:37.34 |
-12:08:15.8 |
HIP 59272 |
17.01 |
| 2026-02-15 00:00 |
12:09:27.65 |
-12:08:08.8 |
HIP 59272 |
16.75 |
| 2026-02-15 12:00 |
12:09:17.85 |
-12:08:00.8 |
HIP 59272 |
16.81 |
| 2026-02-16 00:00 |
12:09:07.93 |
-12:07:51.8 |
HIP 59272 |
17.20 |
| 2026-02-16 12:00 |
12:08:57.92 |
-12:07:41.8 |
HIP 59272 |
17.92 |
| 2026-02-17 00:00 |
12:08:47.79 |
-12:07:30.9 |
HIP 59272 |
18.92 |
| 2026-02-17 12:00 |
12:08:37.56 |
-12:07:18.9 |
HIP 59272 |
20.19 |
| 2026-02-18 00:00 |
12:08:27.23 |
-12:07:05.9 |
HIP 59272 |
21.68 |
| 2026-02-18 12:00 |
12:08:16.80 |
-12:06:52.0 |
HIP 59068 |
23.13 |
| 2026-02-19 00:00 |
12:08:06.26 |
-12:06:37.1 |
HIP 59068 |
20.81 |
| 2026-02-19 12:00 |
12:07:55.63 |
-12:06:21.2 |
HIP 59068 |
18.54 |
| 2026-02-20 00:00 |
12:07:44.90 |
-12:06:04.3 |
HIP 59068 |
16.36 |
| 2026-02-20 12:00 |
12:07:34.07 |
-12:05:46.4 |
HIP 59068 |
14.33 |
| 2026-02-21 00:00 |
12:07:23.15 |
-12:05:27.6 |
HIP 59068 |
12.54 |
| 2026-02-21 12:00 |
12:07:12.14 |
-12:05:07.9 |
HIP 59068 |
11.11 |
| 2026-02-22 00:00 |
12:07:01.03 |
-12:04:47.1 |
HIP 59068 |
10.22 |
| 2026-02-22 12:00 |
12:06:49.84 |
-12:04:25.4 |
HIP 59068 |
10.04 |
| 2026-02-23 00:00 |
12:06:38.55 |
-12:04:02.8 |
HIP 59068 |
10.63 |
| 2026-02-23 12:00 |
12:06:27.18 |
-12:03:39.2 |
HIP 59068 |
11.87 |
| 2026-02-24 00:00 |
12:06:15.72 |
-12:03:14.7 |
HIP 59068 |
13.62 |