| Parameter |
Value |
| Designation |
C/2020 R6 (Rankin) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2019-09-09T23:50:03.036480Z |
| Orbit solution date (soln_date, UTC) |
2021-12-17T03:12:50Z |
| Obs used |
56 |
| NEO |
- |
| M1 |
14.800 |
| K1 |
4.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2020-09-15T10:08:55.968000Z |
| Discovery magnitude (MPC) |
20.20 G |
| Discovery observatory (MPC) |
G96 · University of Arizona Mt. Lemmon Survey |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2020-08-21.0000000 |
| e |
0.99221066 |
| q (au) |
3.129707 |
| a (au) |
401.793824 |
| i (deg) |
82.814904 |
| Ω (om, deg) |
12.177097 |
| ω (w, deg) |
272.005055 |
| M (ma, deg) |
0.042343 |
Magnitude
Scatter + Global Linear
$$
M_a = (17.617 + 2.630\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
17.617 |
| n |
2.630 |
| gf |
1.000 |
| gb |
-0.821 |
| k |
0.800 |
| δ90 |
9.998 |
| 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 |
23:42:26.38 |
+48:13:49.2 |
HIP 116911 |
9.51 |
| 2026-09-20 12:00 |
23:42:16.39 |
+48:13:31.3 |
HIP 116911 |
8.95 |
| 2026-09-21 00:00 |
23:42:06.41 |
+48:13:12.8 |
HIP 116911 |
8.71 |
| 2026-09-21 12:00 |
23:41:56.44 |
+48:12:53.5 |
HIP 116911 |
8.80 |
| 2026-09-22 00:00 |
23:41:46.47 |
+48:12:33.6 |
HIP 116911 |
9.22 |
| 2026-09-22 12:00 |
23:41:36.51 |
+48:12:12.9 |
HIP 116911 |
9.92 |
| 2026-09-23 00:00 |
23:41:26.57 |
+48:11:51.5 |
HIP 116911 |
10.86 |
| 2026-09-23 12:00 |
23:41:16.63 |
+48:11:29.4 |
HIP 116911 |
11.97 |
| 2026-09-24 00:00 |
23:41:06.70 |
+48:11:06.6 |
HIP 116911 |
13.22 |
| 2026-09-24 12:00 |
23:40:56.78 |
+48:10:43.1 |
HIP 116911 |
14.56 |
| 2026-09-25 00:00 |
23:40:46.88 |
+48:10:18.9 |
HIP 116911 |
15.98 |
| 2026-09-25 12:00 |
23:40:36.99 |
+48:09:54.0 |
HIP 116911 |
17.45 |
| 2026-09-26 00:00 |
23:40:27.11 |
+48:09:28.4 |
HIP 116911 |
18.97 |
| 2026-09-26 12:00 |
23:40:17.25 |
+48:09:02.2 |
HIP 116911 |
20.52 |
| 2026-09-27 00:00 |
23:40:07.40 |
+48:08:35.2 |
HIP 116911 |
22.10 |
| 2026-09-27 12:00 |
23:39:57.57 |
+48:08:07.6 |
HIP 116911 |
23.70 |
| 2026-09-28 00:00 |
23:39:47.76 |
+48:07:39.3 |
HIP 116895 |
25.24 |
| 2026-09-28 12:00 |
23:39:37.96 |
+48:07:10.3 |
HIP 116895 |
26.79 |
| 2026-09-29 00:00 |
23:39:28.19 |
+48:06:40.7 |
HIP 116605 |
25.85 |
| 2026-09-29 12:00 |
23:39:18.43 |
+48:06:10.3 |
HIP 116605 |
24.46 |
| 2026-09-30 00:00 |
23:39:08.69 |
+48:05:39.3 |
HIP 116605 |
23.09 |
| 2026-09-30 12:00 |
23:38:58.98 |
+48:05:07.7 |
HIP 116605 |
21.77 |
| 2026-10-01 00:00 |
23:38:49.29 |
+48:04:35.4 |
HIP 116605 |
20.50 |
| 2026-10-01 12:00 |
23:38:39.62 |
+48:04:02.4 |
HIP 116605 |
19.29 |
| 2026-10-02 00:00 |
23:38:29.98 |
+48:03:28.8 |
HIP 116605 |
18.15 |
| 2026-10-02 12:00 |
23:38:20.36 |
+48:02:54.5 |
HIP 116605 |
17.09 |
| 2026-10-03 00:00 |
23:38:10.76 |
+48:02:19.6 |
HIP 116605 |
16.14 |
| 2026-10-03 12:00 |
23:38:01.19 |
+48:01:44.0 |
HIP 116605 |
15.31 |
| 2026-10-04 00:00 |
23:37:51.65 |
+48:01:07.8 |
HIP 116605 |
14.62 |
| 2026-10-04 12:00 |
23:37:42.14 |
+48:00:30.9 |
HIP 116605 |
14.09 |
| 2026-10-05 00:00 |
23:37:32.66 |
+47:59:53.5 |
HIP 116605 |
13.75 |
| 2026-10-05 12:00 |
23:37:23.21 |
+47:59:15.4 |
HIP 116605 |
13.60 |
| 2026-10-06 00:00 |
23:37:13.78 |
+47:58:36.6 |
HIP 116605 |
13.66 |
| 2026-10-06 12:00 |
23:37:04.39 |
+47:57:57.3 |
HIP 116605 |
13.91 |
| 2026-10-07 00:00 |
23:36:55.03 |
+47:57:17.3 |
HIP 116605 |
14.35 |
| 2026-10-07 12:00 |
23:36:45.71 |
+47:56:36.8 |
HIP 116605 |
14.97 |
| 2026-10-08 00:00 |
23:36:36.42 |
+47:55:55.6 |
HIP 116605 |
15.73 |
| 2026-10-08 12:00 |
23:36:27.16 |
+47:55:13.8 |
HIP 116605 |
16.63 |
| 2026-10-09 00:00 |
23:36:17.94 |
+47:54:31.5 |
HIP 116605 |
17.63 |
| 2026-10-09 12:00 |
23:36:08.76 |
+47:53:48.5 |
HIP 116605 |
18.73 |
| 2026-10-10 00:00 |
23:35:59.61 |
+47:53:05.0 |
HIP 116605 |
19.90 |
| 2026-10-10 12:00 |
23:35:50.50 |
+47:52:20.8 |
HIP 116605 |
21.14 |
| 2026-10-11 00:00 |
23:35:41.44 |
+47:51:36.1 |
HIP 116605 |
22.43 |