| Parameter |
Value |
| Designation |
C/2020 F5 (MASTER) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2021-03-22T10:15:53.521920Z |
| Orbit solution date (soln_date, UTC) |
2024-10-31T13:12:14Z |
| Obs used |
1861 |
| NEO |
- |
| M1 |
7.200 |
| K1 |
7.750 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2022-03-27.0000000 |
| e |
0.99509246 |
| q (au) |
4.324799 |
| a (au) |
881.256429 |
| i (deg) |
52.256923 |
| Ω (om, deg) |
350.527461 |
| ω (w, deg) |
310.997698 |
| M (ma, deg) |
0.013924 |
Magnitude
Scatter + Global Linear
$$
M_a = (5.786 + 3.334\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
5.786 |
| n |
3.334 |
| gf |
1.000 |
| gb |
-1.000 |
| 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) |
| 2026-05-12 00:00 |
01:14:41.38 |
+54:03:22.8 |
HIP 5683 |
25.10 |
| 2026-05-12 12:00 |
01:14:53.95 |
+54:04:59.8 |
HIP 5683 |
24.89 |
| 2026-05-13 00:00 |
01:15:06.47 |
+54:06:37.3 |
HIP 5683 |
24.92 |
| 2026-05-13 12:00 |
01:15:18.95 |
+54:08:15.2 |
HIP 5683 |
25.17 |
| 2026-05-14 00:00 |
01:15:31.39 |
+54:09:53.5 |
HIP 5683 |
25.65 |
| 2026-05-14 12:00 |
01:15:43.78 |
+54:11:32.1 |
HIP 6080 |
26.10 |
| 2026-05-15 00:00 |
01:15:56.12 |
+54:13:11.2 |
HIP 6080 |
25.85 |
| 2026-05-15 12:00 |
01:16:08.42 |
+54:14:50.7 |
HIP 6080 |
25.84 |
| 2026-05-16 00:00 |
01:16:20.67 |
+54:16:30.5 |
HIP 6080 |
26.08 |
| 2026-05-16 12:00 |
01:16:32.87 |
+54:18:10.7 |
HIP 6080 |
26.55 |
| 2026-05-17 00:00 |
01:16:45.02 |
+54:19:51.3 |
HIP 6080 |
27.25 |
| 2026-05-17 12:00 |
01:16:57.13 |
+54:21:32.3 |
HIP 6080 |
28.15 |
| 2026-05-18 00:00 |
01:17:09.18 |
+54:23:13.6 |
HIP 6080 |
29.23 |
| 2026-05-18 12:00 |
01:17:21.19 |
+54:24:55.3 |
HIP 6080 |
30.48 |
| 2026-05-19 00:00 |
01:17:33.14 |
+54:26:37.3 |
HIP 6045 |
30.84 |
| 2026-05-19 12:00 |
01:17:45.04 |
+54:28:19.7 |
HIP 6045 |
29.15 |
| 2026-05-20 00:00 |
01:17:56.88 |
+54:30:02.5 |
HIP 6045 |
27.56 |
| 2026-05-20 12:00 |
01:18:08.68 |
+54:31:45.6 |
HIP 6045 |
26.09 |
| 2026-05-21 00:00 |
01:18:20.42 |
+54:33:29.0 |
HIP 6311 |
24.12 |
| 2026-05-21 12:00 |
01:18:32.10 |
+54:35:12.8 |
HIP 6311 |
22.19 |
| 2026-05-22 00:00 |
01:18:43.73 |
+54:36:56.9 |
HIP 6311 |
20.37 |
| 2026-05-22 12:00 |
01:18:55.30 |
+54:38:41.4 |
HIP 6311 |
18.70 |
| 2026-05-23 00:00 |
01:19:06.82 |
+54:40:26.1 |
HIP 6311 |
17.21 |
| 2026-05-23 12:00 |
01:19:18.28 |
+54:42:11.2 |
HIP 6311 |
15.97 |
| 2026-05-24 00:00 |
01:19:29.68 |
+54:43:56.6 |
HIP 6311 |
15.03 |
| 2026-05-24 12:00 |
01:19:41.03 |
+54:45:42.3 |
HIP 6311 |
14.44 |
| 2026-05-25 00:00 |
01:19:52.31 |
+54:47:28.4 |
HIP 6285 |
12.13 |
| 2026-05-25 12:00 |
01:20:03.54 |
+54:49:14.7 |
HIP 6285 |
9.78 |
| 2026-05-26 00:00 |
01:20:14.71 |
+54:51:01.3 |
HIP 6285 |
7.46 |
| 2026-05-26 12:00 |
01:20:25.82 |
+54:52:48.3 |
HIP 6285 |
5.20 |
| 2026-05-27 00:00 |
01:20:36.86 |
+54:54:35.5 |
HIP 6285 |
3.16 |
| 2026-05-27 12:00 |
01:20:47.85 |
+54:56:23.0 |
HIP 6285 |
2.07 |
| 2026-05-28 00:00 |
01:20:58.77 |
+54:58:10.8 |
HIP 6285 |
3.15 |
| 2026-05-28 12:00 |
01:21:09.63 |
+54:59:58.9 |
HIP 6285 |
5.18 |
| 2026-05-29 00:00 |
01:21:20.43 |
+55:01:47.2 |
HIP 6285 |
7.42 |
| 2026-05-29 12:00 |
01:21:31.16 |
+55:03:35.9 |
HIP 6285 |
9.71 |
| 2026-05-30 00:00 |
01:21:41.83 |
+55:05:24.8 |
HIP 6285 |
12.04 |
| 2026-05-30 12:00 |
01:21:52.44 |
+55:07:14.0 |
HIP 6285 |
14.37 |
| 2026-05-31 00:00 |
01:22:02.98 |
+55:09:03.4 |
HIP 6285 |
16.71 |
| 2026-05-31 12:00 |
01:22:13.45 |
+55:10:53.1 |
HIP 6285 |
19.05 |
| 2026-06-01 00:00 |
01:22:23.86 |
+55:12:43.0 |
HIP 6285 |
21.39 |
| 2026-06-01 12:00 |
01:22:34.20 |
+55:14:33.3 |
HIP 6473 |
22.27 |
| 2026-06-02 00:00 |
01:22:44.47 |
+55:16:23.7 |
HIP 6473 |
20.13 |