| Parameter |
Value |
| Designation |
P/2020 V4 (Rankin) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2021-07-17T22:00:33.958080Z |
| Orbit solution date (soln_date, UTC) |
2025-09-09T12:42:49Z |
| Obs used |
619 |
| NEO |
- |
| M1 |
6.900 |
| K1 |
12.250 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2020-11-15T08:54:34.099200Z |
| Discovery magnitude (MPC) |
19.23 G |
| Discovery observatory (MPC) |
G96 · Mt. Lemmon Survey |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2021-07-15.0000000 |
| e |
0.44887531 |
| q (au) |
5.148536 |
| a (au) |
9.341871 |
| i (deg) |
14.243119 |
| Ω (om, deg) |
203.507931 |
| ω (w, deg) |
256.995659 |
| M (ma, deg) |
359.899307 |
Magnitude
Scatter + Global Linear
$$
M_a = (3.987 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
3.987 |
| n |
6.000 |
| gf |
0.897 |
| gb |
-0.891 |
| k |
1.000 |
| δ90 |
4.956 |
| 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 |
| 2015-10-10 |
2019-11-02 |
-11.2590 |
+10.593 |
| 2019-11-02 |
2021-04-21 |
+31.2874 |
-22.459 |
| 2021-08-30 |
2023-03-21 |
+28.4984 |
-21.118 |
| 2023-03-21 |
2024-03-17 |
-8.3402 |
+7.840 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-03-26 00:00 |
14:15:06.93 |
-11:00:59.3 |
HIP 69691 |
16.56 |
| 2026-03-26 12:00 |
14:14:59.35 |
-10:59:58.3 |
HIP 69691 |
18.62 |
| 2026-03-27 00:00 |
14:14:51.70 |
-10:58:56.9 |
HIP 69691 |
20.71 |
| 2026-03-27 12:00 |
14:14:43.99 |
-10:57:55.2 |
HIP 69691 |
22.82 |
| 2026-03-28 00:00 |
14:14:36.21 |
-10:56:53.3 |
HIP 69691 |
24.96 |
| 2026-03-28 12:00 |
14:14:28.37 |
-10:55:51.1 |
HIP 69691 |
27.11 |
| 2026-03-29 00:00 |
14:14:20.47 |
-10:54:48.6 |
HIP 69691 |
29.29 |
| 2026-03-29 12:00 |
14:14:12.51 |
-10:53:45.8 |
HIP 69691 |
31.48 |
| 2026-03-30 00:00 |
14:14:04.49 |
-10:52:42.8 |
HIP 69691 |
33.69 |
| 2026-03-30 12:00 |
14:13:56.42 |
-10:51:39.5 |
HIP 69691 |
35.92 |
| 2026-03-31 00:00 |
14:13:48.28 |
-10:50:36.0 |
HIP 69427 |
36.69 |
| 2026-03-31 12:00 |
14:13:40.09 |
-10:49:32.2 |
HIP 69338 |
34.63 |
| 2026-04-01 00:00 |
14:13:31.84 |
-10:48:28.2 |
HIP 69338 |
32.35 |
| 2026-04-01 12:00 |
14:13:23.54 |
-10:47:24.0 |
HIP 69338 |
30.06 |
| 2026-04-02 00:00 |
14:13:15.19 |
-10:46:19.5 |
HIP 69338 |
27.76 |
| 2026-04-02 12:00 |
14:13:06.79 |
-10:45:14.8 |
HIP 69338 |
25.45 |
| 2026-04-03 00:00 |
14:12:58.33 |
-10:44:09.9 |
HIP 69338 |
23.13 |
| 2026-04-03 12:00 |
14:12:49.83 |
-10:43:04.8 |
HIP 69338 |
20.80 |
| 2026-04-04 00:00 |
14:12:41.27 |
-10:41:59.5 |
HIP 69338 |
18.46 |
| 2026-04-04 12:00 |
14:12:32.67 |
-10:40:54.0 |
HIP 69338 |
16.12 |
| 2026-04-05 00:00 |
14:12:24.03 |
-10:39:48.3 |
HIP 69338 |
13.78 |
| 2026-04-05 12:00 |
14:12:15.33 |
-10:38:42.4 |
HIP 69338 |
11.45 |
| 2026-04-06 00:00 |
14:12:06.60 |
-10:37:36.3 |
HIP 69338 |
9.14 |
| 2026-04-06 12:00 |
14:11:57.82 |
-10:36:30.1 |
HIP 69338 |
6.89 |
| 2026-04-07 00:00 |
14:11:49.00 |
-10:35:23.7 |
HIP 69338 |
4.81 |
| 2026-04-07 12:00 |
14:11:40.14 |
-10:34:17.2 |
HIP 69338 |
3.26 |
| 2026-04-08 00:00 |
14:11:31.24 |
-10:33:10.5 |
HIP 69338 |
3.16 |
| 2026-04-08 12:00 |
14:11:22.31 |
-10:32:03.7 |
HIP 69325 |
3.41 |
| 2026-04-09 00:00 |
14:11:13.33 |
-10:30:56.7 |
HIP 69325 |
2.64 |
| 2026-04-09 12:00 |
14:11:04.32 |
-10:29:49.6 |
HIP 69325 |
3.82 |
| 2026-04-10 00:00 |
14:10:55.28 |
-10:28:42.4 |
HIP 69325 |
5.89 |
| 2026-04-10 12:00 |
14:10:46.20 |
-10:27:35.1 |
HIP 69325 |
8.20 |
| 2026-04-11 00:00 |
14:10:37.09 |
-10:26:27.6 |
HIP 69325 |
10.61 |
| 2026-04-11 12:00 |
14:10:27.95 |
-10:25:20.1 |
HIP 69325 |
13.06 |
| 2026-04-12 00:00 |
14:10:18.78 |
-10:24:12.5 |
HIP 69325 |
15.54 |
| 2026-04-12 12:00 |
14:10:09.59 |
-10:23:04.8 |
HIP 69127 |
17.23 |
| 2026-04-13 00:00 |
14:10:00.36 |
-10:21:57.0 |
HIP 69127 |
14.82 |
| 2026-04-13 12:00 |
14:09:51.11 |
-10:20:49.1 |
HIP 69127 |
12.45 |
| 2026-04-14 00:00 |
14:09:41.84 |
-10:19:41.2 |
HIP 69127 |
10.15 |
| 2026-04-14 12:00 |
14:09:32.54 |
-10:18:33.2 |
HIP 69127 |
8.00 |
| 2026-04-15 00:00 |
14:09:23.22 |
-10:17:25.2 |
HIP 69127 |
6.17 |
| 2026-04-15 12:00 |
14:09:13.88 |
-10:16:17.1 |
HIP 69127 |
5.00 |
| 2026-04-16 00:00 |
14:09:04.52 |
-10:15:09.0 |
HIP 69127 |
5.02 |