| Parameter |
Value |
| Designation |
C/2020 B3 (Rankin) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2019-10-19T21:22:57Z |
| Orbit solution date (soln_date, UTC) |
2022-07-06T03:12:24Z |
| Obs used |
185 |
| NEO |
- |
| M1 |
14.600 |
| K1 |
4.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2020-03-13.0000000 |
| e |
0.99826805 |
| q (au) |
3.344460 |
| a (au) |
1931.033136 |
| i (deg) |
20.701635 |
| Ω (om, deg) |
185.824602 |
| ω (w, deg) |
325.092308 |
| M (ma, deg) |
0.001685 |
Magnitude
Scatter + Global Linear
$$
M_a = (16.046 + 2.957\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
16.046 |
| n |
2.957 |
| gf |
1.000 |
| gb |
-0.768 |
| k |
0.800 |
| 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) |
| 2026-06-01 00:00 |
18:38:49.88 |
-01:18:13.5 |
HIP 91452 |
13.02 |
| 2026-06-01 12:00 |
18:38:44.65 |
-01:18:00.0 |
HIP 91384 |
12.92 |
| 2026-06-02 00:00 |
18:38:39.39 |
-01:17:46.7 |
HIP 91384 |
12.12 |
| 2026-06-02 12:00 |
18:38:34.10 |
-01:17:33.7 |
HIP 91384 |
11.42 |
| 2026-06-03 00:00 |
18:38:28.78 |
-01:17:21.1 |
HIP 91384 |
10.85 |
| 2026-06-03 12:00 |
18:38:23.44 |
-01:17:08.8 |
HIP 91384 |
10.43 |
| 2026-06-04 00:00 |
18:38:18.06 |
-01:16:56.9 |
HIP 91384 |
10.17 |
| 2026-06-04 12:00 |
18:38:12.66 |
-01:16:45.3 |
HIP 91384 |
10.10 |
| 2026-06-05 00:00 |
18:38:07.23 |
-01:16:34.0 |
HIP 91384 |
10.22 |
| 2026-06-05 12:00 |
18:38:01.78 |
-01:16:23.0 |
HIP 91384 |
10.53 |
| 2026-06-06 00:00 |
18:37:56.30 |
-01:16:12.4 |
HIP 91384 |
11.01 |
| 2026-06-06 12:00 |
18:37:50.79 |
-01:16:02.0 |
HIP 91384 |
11.64 |
| 2026-06-07 00:00 |
18:37:45.26 |
-01:15:52.1 |
HIP 91384 |
12.40 |
| 2026-06-07 12:00 |
18:37:39.71 |
-01:15:42.4 |
HIP 91384 |
13.28 |
| 2026-06-08 00:00 |
18:37:34.13 |
-01:15:33.1 |
HIP 91384 |
14.24 |
| 2026-06-08 12:00 |
18:37:28.53 |
-01:15:24.1 |
HIP 91384 |
15.28 |
| 2026-06-09 00:00 |
18:37:22.91 |
-01:15:15.5 |
HIP 91384 |
16.39 |
| 2026-06-09 12:00 |
18:37:17.26 |
-01:15:07.2 |
HIP 91199 |
16.50 |
| 2026-06-10 00:00 |
18:37:11.59 |
-01:14:59.2 |
HIP 91199 |
15.20 |
| 2026-06-10 12:00 |
18:37:05.91 |
-01:14:51.6 |
HIP 91199 |
13.92 |
| 2026-06-11 00:00 |
18:37:00.20 |
-01:14:44.3 |
HIP 91199 |
12.67 |
| 2026-06-11 12:00 |
18:36:54.47 |
-01:14:37.4 |
HIP 91199 |
11.45 |
| 2026-06-12 00:00 |
18:36:48.72 |
-01:14:30.8 |
HIP 91199 |
10.28 |
| 2026-06-12 12:00 |
18:36:42.95 |
-01:14:24.5 |
HIP 91199 |
9.18 |
| 2026-06-13 00:00 |
18:36:37.17 |
-01:14:18.6 |
HIP 91199 |
8.18 |
| 2026-06-13 12:00 |
18:36:31.37 |
-01:14:13.0 |
HIP 91199 |
7.32 |
| 2026-06-14 00:00 |
18:36:25.55 |
-01:14:07.8 |
HIP 91199 |
6.67 |
| 2026-06-14 12:00 |
18:36:19.71 |
-01:14:02.9 |
HIP 91199 |
6.29 |
| 2026-06-15 00:00 |
18:36:13.86 |
-01:13:58.3 |
HIP 91199 |
6.22 |
| 2026-06-15 12:00 |
18:36:07.99 |
-01:13:54.1 |
HIP 91199 |
6.50 |
| 2026-06-16 00:00 |
18:36:02.11 |
-01:13:50.3 |
HIP 91199 |
7.07 |
| 2026-06-16 12:00 |
18:35:56.21 |
-01:13:46.8 |
HIP 91199 |
7.87 |
| 2026-06-17 00:00 |
18:35:50.30 |
-01:13:43.6 |
HIP 91199 |
8.85 |
| 2026-06-17 12:00 |
18:35:44.38 |
-01:13:40.8 |
HIP 91199 |
9.95 |
| 2026-06-18 00:00 |
18:35:38.44 |
-01:13:38.3 |
HIP 91199 |
11.13 |
| 2026-06-18 12:00 |
18:35:32.50 |
-01:13:36.2 |
HIP 91199 |
12.39 |
| 2026-06-19 00:00 |
18:35:26.54 |
-01:13:34.4 |
HIP 91199 |
13.68 |
| 2026-06-19 12:00 |
18:35:20.57 |
-01:13:33.0 |
HIP 91199 |
15.02 |
| 2026-06-20 00:00 |
18:35:14.60 |
-01:13:31.9 |
HIP 91199 |
16.38 |
| 2026-06-20 12:00 |
18:35:08.61 |
-01:13:31.1 |
HIP 91199 |
17.76 |
| 2026-06-21 00:00 |
18:35:02.61 |
-01:13:30.7 |
HIP 91199 |
19.16 |
| 2026-06-21 12:00 |
18:34:56.61 |
-01:13:30.7 |
HIP 91199 |
20.57 |
| 2026-06-22 00:00 |
18:34:50.60 |
-01:13:30.9 |
HIP 91199 |
22.00 |