| Parameter |
Value |
| Designation |
C/2020 K7 (PANSTARRS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2019-10-28T18:33:30.147840Z |
| Orbit solution date (soln_date, UTC) |
2023-01-14T00:12:34Z |
| Obs used |
114 |
| NEO |
- |
| M1 |
12.200 |
| K1 |
4.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2020-05-30T13:09:12.211200Z |
| Discovery magnitude (MPC) |
20.21 w |
| Discovery observatory (MPC) |
F51 · Pan-STARRS 1, Haleakala |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2020-09-01.0000000 |
| e |
0.94160673 |
| q (au) |
6.383959 |
| a (au) |
109.326969 |
| i (deg) |
32.066780 |
| Ω (om, deg) |
286.109728 |
| ω (w, deg) |
358.125971 |
| M (ma, deg) |
0.265756 |
Magnitude
Scatter + Global Linear
$$
M_a = (10.865 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
10.865 |
| n |
2.000 |
| gf |
0.996 |
| gb |
-1.000 |
| 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) |
| 2026-09-20 00:00 |
01:01:45.37 |
+42:38:41.9 |
HIP 4883 |
15.22 |
| 2026-09-20 12:00 |
01:01:38.30 |
+42:38:36.9 |
HIP 4883 |
16.22 |
| 2026-09-21 00:00 |
01:01:31.20 |
+42:38:31.2 |
HIP 4883 |
17.28 |
| 2026-09-21 12:00 |
01:01:24.07 |
+42:38:24.8 |
HIP 4883 |
18.38 |
| 2026-09-22 00:00 |
01:01:16.91 |
+42:38:17.8 |
HIP 4883 |
19.52 |
| 2026-09-22 12:00 |
01:01:09.72 |
+42:38:10.1 |
HIP 4883 |
20.69 |
| 2026-09-23 00:00 |
01:01:02.51 |
+42:38:01.6 |
HIP 4883 |
21.88 |
| 2026-09-23 12:00 |
01:00:55.28 |
+42:37:52.5 |
HIP 4621 |
21.63 |
| 2026-09-24 00:00 |
01:00:48.02 |
+42:37:42.7 |
HIP 4621 |
20.70 |
| 2026-09-24 12:00 |
01:00:40.74 |
+42:37:32.3 |
HIP 4621 |
19.81 |
| 2026-09-25 00:00 |
01:00:33.43 |
+42:37:21.1 |
HIP 4621 |
18.99 |
| 2026-09-25 12:00 |
01:00:26.11 |
+42:37:09.3 |
HIP 4621 |
18.24 |
| 2026-09-26 00:00 |
01:00:18.76 |
+42:36:56.8 |
HIP 4621 |
17.56 |
| 2026-09-26 12:00 |
01:00:11.39 |
+42:36:43.6 |
HIP 4621 |
16.98 |
| 2026-09-27 00:00 |
01:00:04.00 |
+42:36:29.8 |
HIP 4621 |
16.50 |
| 2026-09-27 12:00 |
00:59:56.60 |
+42:36:15.2 |
HIP 4621 |
16.13 |
| 2026-09-28 00:00 |
00:59:49.18 |
+42:36:00.0 |
HIP 4621 |
15.88 |
| 2026-09-28 12:00 |
00:59:41.73 |
+42:35:44.1 |
HIP 4621 |
15.76 |
| 2026-09-29 00:00 |
00:59:34.28 |
+42:35:27.6 |
HIP 4621 |
15.78 |
| 2026-09-29 12:00 |
00:59:26.81 |
+42:35:10.3 |
HIP 4621 |
15.92 |
| 2026-09-30 00:00 |
00:59:19.32 |
+42:34:52.4 |
HIP 4621 |
16.21 |
| 2026-09-30 12:00 |
00:59:11.82 |
+42:34:33.9 |
HIP 4621 |
16.61 |
| 2026-10-01 00:00 |
00:59:04.31 |
+42:34:14.6 |
HIP 4621 |
17.14 |
| 2026-10-01 12:00 |
00:58:56.78 |
+42:33:54.7 |
HIP 4621 |
17.77 |
| 2026-10-02 00:00 |
00:58:49.24 |
+42:33:34.1 |
HIP 4621 |
18.51 |
| 2026-10-02 12:00 |
00:58:41.69 |
+42:33:12.9 |
HIP 4621 |
19.33 |
| 2026-10-03 00:00 |
00:58:34.14 |
+42:32:51.0 |
HIP 4621 |
20.23 |
| 2026-10-03 12:00 |
00:58:26.57 |
+42:32:28.4 |
HIP 4621 |
21.20 |
| 2026-10-04 00:00 |
00:58:19.00 |
+42:32:05.2 |
HIP 4621 |
22.23 |
| 2026-10-04 12:00 |
00:58:11.42 |
+42:31:41.3 |
HIP 4621 |
23.32 |
| 2026-10-05 00:00 |
00:58:03.83 |
+42:31:16.8 |
HIP 4621 |
24.45 |
| 2026-10-05 12:00 |
00:57:56.24 |
+42:30:51.6 |
HIP 4621 |
25.62 |
| 2026-10-06 00:00 |
00:57:48.64 |
+42:30:25.7 |
HIP 4621 |
26.84 |
| 2026-10-06 12:00 |
00:57:41.04 |
+42:29:59.2 |
HIP 4621 |
28.08 |
| 2026-10-07 00:00 |
00:57:33.43 |
+42:29:32.0 |
HIP 4315 |
27.81 |
| 2026-10-07 12:00 |
00:57:25.83 |
+42:29:04.2 |
HIP 4315 |
26.72 |
| 2026-10-08 00:00 |
00:57:18.22 |
+42:28:35.8 |
HIP 4315 |
25.67 |
| 2026-10-08 12:00 |
00:57:10.62 |
+42:28:06.7 |
HIP 4315 |
24.66 |
| 2026-10-09 00:00 |
00:57:03.01 |
+42:27:37.0 |
HIP 4315 |
23.72 |
| 2026-10-09 12:00 |
00:56:55.41 |
+42:27:06.6 |
HIP 4315 |
22.84 |
| 2026-10-10 00:00 |
00:56:47.81 |
+42:26:35.7 |
HIP 4307 |
21.42 |
| 2026-10-10 12:00 |
00:56:40.22 |
+42:26:04.0 |
HIP 4307 |
19.96 |
| 2026-10-11 00:00 |
00:56:32.62 |
+42:25:31.8 |
HIP 4307 |
18.49 |