| 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) |
| 2026-03-26 00:00 |
18:43:30.77 |
-02:24:39.2 |
HIP 91925 |
13.71 |
| 2026-03-26 12:00 |
18:43:32.42 |
-02:24:00.6 |
HIP 91925 |
13.56 |
| 2026-03-27 00:00 |
18:43:34.02 |
-02:23:22.1 |
HIP 91925 |
13.47 |
| 2026-03-27 12:00 |
18:43:35.56 |
-02:22:43.5 |
HIP 91925 |
13.43 |
| 2026-03-28 00:00 |
18:43:37.04 |
-02:22:05.0 |
HIP 91925 |
13.45 |
| 2026-03-28 12:00 |
18:43:38.46 |
-02:21:26.5 |
HIP 91925 |
13.52 |
| 2026-03-29 00:00 |
18:43:39.81 |
-02:20:48.1 |
HIP 91925 |
13.63 |
| 2026-03-29 12:00 |
18:43:41.11 |
-02:20:09.6 |
HIP 91925 |
13.80 |
| 2026-03-30 00:00 |
18:43:42.35 |
-02:19:31.2 |
HIP 91925 |
14.01 |
| 2026-03-30 12:00 |
18:43:43.53 |
-02:18:52.8 |
HIP 91925 |
14.27 |
| 2026-03-31 00:00 |
18:43:44.65 |
-02:18:14.5 |
HIP 91925 |
14.56 |
| 2026-03-31 12:00 |
18:43:45.71 |
-02:17:36.2 |
HIP 91925 |
14.89 |
| 2026-04-01 00:00 |
18:43:46.71 |
-02:16:58.0 |
HIP 91925 |
15.25 |
| 2026-04-01 12:00 |
18:43:47.65 |
-02:16:19.8 |
HIP 91925 |
15.64 |
| 2026-04-02 00:00 |
18:43:48.53 |
-02:15:41.6 |
HIP 91925 |
16.06 |
| 2026-04-02 12:00 |
18:43:49.35 |
-02:15:03.5 |
HIP 91925 |
16.50 |
| 2026-04-03 00:00 |
18:43:50.11 |
-02:14:25.4 |
HIP 91925 |
16.96 |
| 2026-04-03 12:00 |
18:43:50.81 |
-02:13:47.4 |
HIP 91925 |
17.44 |
| 2026-04-04 00:00 |
18:43:51.45 |
-02:13:09.5 |
HIP 91925 |
17.94 |
| 2026-04-04 12:00 |
18:43:52.03 |
-02:12:31.6 |
HIP 91925 |
18.45 |
| 2026-04-05 00:00 |
18:43:52.55 |
-02:11:53.8 |
HIP 91925 |
18.98 |
| 2026-04-05 12:00 |
18:43:53.01 |
-02:11:16.0 |
HIP 91925 |
19.51 |
| 2026-04-06 00:00 |
18:43:53.41 |
-02:10:38.4 |
HIP 91925 |
20.06 |
| 2026-04-06 12:00 |
18:43:53.75 |
-02:10:00.7 |
HIP 91925 |
20.62 |
| 2026-04-07 00:00 |
18:43:54.03 |
-02:09:23.2 |
HIP 91925 |
21.18 |
| 2026-04-07 12:00 |
18:43:54.25 |
-02:08:45.7 |
HIP 91925 |
21.75 |
| 2026-04-08 00:00 |
18:43:54.41 |
-02:08:08.4 |
HIP 91925 |
22.33 |
| 2026-04-08 12:00 |
18:43:54.51 |
-02:07:31.1 |
HIP 91925 |
22.91 |
| 2026-04-09 00:00 |
18:43:54.55 |
-02:06:53.8 |
HIP 91925 |
23.50 |
| 2026-04-09 12:00 |
18:43:54.52 |
-02:06:16.7 |
HIP 91925 |
24.10 |
| 2026-04-10 00:00 |
18:43:54.44 |
-02:05:39.7 |
HIP 91925 |
24.69 |
| 2026-04-10 12:00 |
18:43:54.30 |
-02:05:02.7 |
HIP 91925 |
25.30 |
| 2026-04-11 00:00 |
18:43:54.10 |
-02:04:25.9 |
HIP 91925 |
25.90 |
| 2026-04-11 12:00 |
18:43:53.84 |
-02:03:49.1 |
HIP 91925 |
26.51 |
| 2026-04-12 00:00 |
18:43:53.52 |
-02:03:12.5 |
HIP 91822 |
26.03 |
| 2026-04-12 12:00 |
18:43:53.14 |
-02:02:36.0 |
HIP 91822 |
25.43 |
| 2026-04-13 00:00 |
18:43:52.70 |
-02:01:59.5 |
HIP 91822 |
24.82 |
| 2026-04-13 12:00 |
18:43:52.19 |
-02:01:23.2 |
HIP 91822 |
24.21 |
| 2026-04-14 00:00 |
18:43:51.63 |
-02:00:47.0 |
HIP 91822 |
23.60 |
| 2026-04-14 12:00 |
18:43:51.01 |
-02:00:10.9 |
HIP 91822 |
22.98 |
| 2026-04-15 00:00 |
18:43:50.33 |
-01:59:34.9 |
HIP 91822 |
22.36 |
| 2026-04-15 12:00 |
18:43:49.59 |
-01:58:59.1 |
HIP 91822 |
21.74 |
| 2026-04-16 00:00 |
18:43:48.79 |
-01:58:23.4 |
HIP 91822 |
21.11 |