C/2020 K6 (Rankin)
| Parameter |
Value |
| Designation |
C/2020 K6 (Rankin) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2021-09-15T13:36:00.020160Z |
| Orbit solution date (soln_date, UTC) |
2023-06-30T22:15:05Z |
| Obs used |
180 |
| NEO |
- |
| M1 |
12.000 |
| K1 |
5.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2020-05-26T08:55:19.200000Z |
| Discovery magnitude (MPC) |
20.50 G |
| Discovery observatory (MPC) |
G96 · Mt. Lemmon Survey |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2022-01-04.0000000 |
| e |
1.00320001 |
| q (au) |
5.868420 |
| a (au) |
-1833.877552 |
| i (deg) |
103.645272 |
| Ω (om, deg) |
291.528614 |
| ω (w, deg) |
44.307127 |
| M (ma, deg) |
0.001386 |
Magnitude
Scatter + Global Linear
$$
M_a = (10.183 + 2.419\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
10.183 |
| n |
2.419 |
| gf |
0.999 |
| 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 |
09:51:50.33 |
+63:18:14.2 |
HIP 48034 |
29.38 |
| 2026-02-03 12:00 |
09:51:23.52 |
+63:18:40.3 |
HIP 48034 |
26.44 |
| 2026-02-04 00:00 |
09:50:56.68 |
+63:19:05.0 |
HIP 48034 |
23.53 |
| 2026-02-04 12:00 |
09:50:29.81 |
+63:19:28.5 |
HIP 48034 |
20.64 |
| 2026-02-05 00:00 |
09:50:02.91 |
+63:19:50.6 |
HIP 48034 |
17.81 |
| 2026-02-05 12:00 |
09:49:35.98 |
+63:20:11.4 |
HIP 48034 |
15.04 |
| 2026-02-06 00:00 |
09:49:09.03 |
+63:20:30.8 |
HIP 48034 |
12.40 |
| 2026-02-06 12:00 |
09:48:42.06 |
+63:20:48.9 |
HIP 48034 |
9.97 |
| 2026-02-07 00:00 |
09:48:15.07 |
+63:21:05.7 |
HIP 48034 |
7.96 |
| 2026-02-07 12:00 |
09:47:48.07 |
+63:21:21.1 |
HIP 48034 |
6.75 |
| 2026-02-08 00:00 |
09:47:21.05 |
+63:21:35.2 |
HIP 48034 |
6.79 |
| 2026-02-08 12:00 |
09:46:54.03 |
+63:21:47.9 |
HIP 48034 |
8.05 |
| 2026-02-09 00:00 |
09:46:27.01 |
+63:21:59.3 |
HIP 48034 |
10.08 |
| 2026-02-09 12:00 |
09:45:59.98 |
+63:22:09.3 |
HIP 48034 |
12.52 |
| 2026-02-10 00:00 |
09:45:32.95 |
+63:22:18.0 |
HIP 48034 |
15.16 |
| 2026-02-10 12:00 |
09:45:05.93 |
+63:22:25.3 |
HIP 47911 |
17.67 |
| 2026-02-11 00:00 |
09:44:38.91 |
+63:22:31.2 |
HIP 47911 |
18.74 |
| 2026-02-11 12:00 |
09:44:11.91 |
+63:22:35.7 |
HIP 47911 |
20.22 |
| 2026-02-12 00:00 |
09:43:44.92 |
+63:22:38.9 |
HIP 47911 |
22.04 |
| 2026-02-12 12:00 |
09:43:17.94 |
+63:22:40.8 |
HIP 47911 |
24.11 |
| 2026-02-13 00:00 |
09:42:50.99 |
+63:22:41.2 |
HIP 47911 |
26.37 |
| 2026-02-13 12:00 |
09:42:24.06 |
+63:22:40.3 |
HIP 47675 |
27.68 |
| 2026-02-14 00:00 |
09:41:57.15 |
+63:22:38.0 |
HIP 47675 |
28.43 |
| 2026-02-14 12:00 |
09:41:30.27 |
+63:22:34.3 |
HIP 47675 |
29.46 |
| 2026-02-15 00:00 |
09:41:03.43 |
+63:22:29.3 |
HIP 47675 |
30.74 |
| 2026-02-15 12:00 |
09:40:36.62 |
+63:22:22.9 |
HIP 47675 |
32.23 |
| 2026-02-16 00:00 |
09:40:09.85 |
+63:22:15.1 |
HIP 47062 |
33.81 |
| 2026-02-16 12:00 |
09:39:43.12 |
+63:22:06.0 |
HIP 47062 |
30.95 |
| 2026-02-17 00:00 |
09:39:16.44 |
+63:21:55.4 |
HIP 47062 |
28.12 |
| 2026-02-17 12:00 |
09:38:49.80 |
+63:21:43.5 |
HIP 47062 |
25.31 |
| 2026-02-18 00:00 |
09:38:23.22 |
+63:21:30.3 |
HIP 47062 |
22.56 |
| 2026-02-18 12:00 |
09:37:56.68 |
+63:21:15.7 |
HIP 47062 |
19.86 |
| 2026-02-19 00:00 |
09:37:30.21 |
+63:20:59.7 |
HIP 47062 |
17.25 |
| 2026-02-19 12:00 |
09:37:03.80 |
+63:20:42.3 |
HIP 47062 |
14.78 |
| 2026-02-20 00:00 |
09:36:37.44 |
+63:20:23.6 |
HIP 47062 |
12.52 |
| 2026-02-20 12:00 |
09:36:11.16 |
+63:20:03.5 |
HIP 47062 |
10.60 |
| 2026-02-21 00:00 |
09:35:44.94 |
+63:19:42.1 |
HIP 47062 |
9.24 |
| 2026-02-21 12:00 |
09:35:18.80 |
+63:19:19.4 |
HIP 47062 |
8.70 |
| 2026-02-22 00:00 |
09:34:52.73 |
+63:18:55.3 |
HIP 47062 |
9.11 |
| 2026-02-22 12:00 |
09:34:26.73 |
+63:18:29.8 |
HIP 47062 |
10.37 |
| 2026-02-23 00:00 |
09:34:00.82 |
+63:18:03.0 |
HIP 47062 |
12.21 |
| 2026-02-23 12:00 |
09:33:34.99 |
+63:17:34.9 |
HIP 47062 |
14.40 |
| 2026-02-24 00:00 |
09:33:09.25 |
+63:17:05.5 |
HIP 47062 |
16.81 |