C/2020 K7 (PANSTARRS)
| 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
$$
M_a = (10.874 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
10.874 |
| n |
2.000 |
| gf |
0.953 |
| gb |
-1.000 |
| k |
1.000 |
| δ90 |
9.377 |
| 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
Residuals (Piecewise)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| Start (UTC) |
End (UTC) |
a |
b |
| 2018-05-20 |
2019-07-11 |
+39.5647 |
-30.951 |
| 2020-05-30 |
2021-09-13 |
-7.7860 |
+6.407 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
00:24:53.11 |
+36:47:35.9 |
HIP 1882 |
14.94 |
| 2026-02-03 12:00 |
00:25:00.80 |
+36:47:18.5 |
HIP 2064 |
15.88 |
| 2026-02-04 00:00 |
00:25:08.54 |
+36:47:01.6 |
HIP 2064 |
14.78 |
| 2026-02-04 12:00 |
00:25:16.34 |
+36:46:45.4 |
HIP 2064 |
13.76 |
| 2026-02-05 00:00 |
00:25:24.18 |
+36:46:29.8 |
HIP 2064 |
12.84 |
| 2026-02-05 12:00 |
00:25:32.08 |
+36:46:14.8 |
HIP 2064 |
12.05 |
| 2026-02-06 00:00 |
00:25:40.03 |
+36:46:00.4 |
HIP 2064 |
11.41 |
| 2026-02-06 12:00 |
00:25:48.03 |
+36:45:46.7 |
HIP 2064 |
10.96 |
| 2026-02-07 00:00 |
00:25:56.08 |
+36:45:33.5 |
HIP 2064 |
10.73 |
| 2026-02-07 12:00 |
00:26:04.18 |
+36:45:20.9 |
HIP 2064 |
10.73 |
| 2026-02-08 00:00 |
00:26:12.33 |
+36:45:09.0 |
HIP 2064 |
10.96 |
| 2026-02-08 12:00 |
00:26:20.53 |
+36:44:57.7 |
HIP 2064 |
11.42 |
| 2026-02-09 00:00 |
00:26:28.77 |
+36:44:47.0 |
HIP 2064 |
12.09 |
| 2026-02-09 12:00 |
00:26:37.07 |
+36:44:36.9 |
HIP 2064 |
12.92 |
| 2026-02-10 00:00 |
00:26:45.41 |
+36:44:27.4 |
HIP 2064 |
13.91 |
| 2026-02-10 12:00 |
00:26:53.80 |
+36:44:18.5 |
HIP 2064 |
15.02 |
| 2026-02-11 00:00 |
00:27:02.23 |
+36:44:10.3 |
HIP 2064 |
16.23 |
| 2026-02-11 12:00 |
00:27:10.71 |
+36:44:02.6 |
HIP 2064 |
17.51 |
| 2026-02-12 00:00 |
00:27:19.24 |
+36:43:55.6 |
HIP 2064 |
18.87 |
| 2026-02-12 12:00 |
00:27:27.81 |
+36:43:49.2 |
HIP 2064 |
20.27 |
| 2026-02-13 00:00 |
00:27:36.43 |
+36:43:43.4 |
HIP 2270 |
19.06 |
| 2026-02-13 12:00 |
00:27:45.09 |
+36:43:38.2 |
HIP 2270 |
17.67 |
| 2026-02-14 00:00 |
00:27:53.80 |
+36:43:33.7 |
HIP 2270 |
16.34 |
| 2026-02-14 12:00 |
00:28:02.55 |
+36:43:29.7 |
HIP 2270 |
15.08 |
| 2026-02-15 00:00 |
00:28:11.34 |
+36:43:26.4 |
HIP 2270 |
13.91 |
| 2026-02-15 12:00 |
00:28:20.18 |
+36:43:23.6 |
HIP 2270 |
12.86 |
| 2026-02-16 00:00 |
00:28:29.05 |
+36:43:21.5 |
HIP 2270 |
11.98 |
| 2026-02-16 12:00 |
00:28:37.97 |
+36:43:20.0 |
HIP 2270 |
11.29 |
| 2026-02-17 00:00 |
00:28:46.93 |
+36:43:19.1 |
HIP 2270 |
10.84 |
| 2026-02-17 12:00 |
00:28:55.93 |
+36:43:18.8 |
HIP 2270 |
10.67 |
| 2026-02-18 00:00 |
00:29:04.97 |
+36:43:19.1 |
HIP 2270 |
10.79 |
| 2026-02-18 12:00 |
00:29:14.05 |
+36:43:20.1 |
HIP 2270 |
11.20 |
| 2026-02-19 00:00 |
00:29:23.17 |
+36:43:21.6 |
HIP 2270 |
11.87 |
| 2026-02-19 12:00 |
00:29:32.33 |
+36:43:23.7 |
HIP 2270 |
12.77 |
| 2026-02-20 00:00 |
00:29:41.52 |
+36:43:26.5 |
HIP 2270 |
13.85 |
| 2026-02-20 12:00 |
00:29:50.75 |
+36:43:29.8 |
HIP 2270 |
15.07 |
| 2026-02-21 00:00 |
00:30:00.02 |
+36:43:33.8 |
HIP 2270 |
16.41 |
| 2026-02-21 12:00 |
00:30:09.33 |
+36:43:38.3 |
HIP 2270 |
17.85 |
| 2026-02-22 00:00 |
00:30:18.67 |
+36:43:43.5 |
HIP 2270 |
19.35 |
| 2026-02-22 12:00 |
00:30:28.04 |
+36:43:49.2 |
HIP 2270 |
20.92 |
| 2026-02-23 00:00 |
00:30:37.45 |
+36:43:55.6 |
HIP 2509 |
20.16 |
| 2026-02-23 12:00 |
00:30:46.90 |
+36:44:02.5 |
HIP 2509 |
18.77 |
| 2026-02-24 00:00 |
00:30:56.37 |
+36:44:10.0 |
HIP 2509 |
17.46 |