| Parameter |
Value |
| Designation |
C/2020 Q1 (Borisov) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2020-08-14T15:47:50.138880Z |
| Orbit solution date (soln_date, UTC) |
2022-06-07T21:44:52Z |
| Obs used |
280 |
| NEO |
- |
| M1 |
11.700 |
| K1 |
41.250 |
| PC |
0.030 |
| Discovery observation (MPC, UTC) |
2020-08-17T23:14:45.312000Z |
| Discovery magnitude (MPC) |
17.80 R |
| Discovery observatory (MPC) |
L51 · MARGO, Nauchnyi |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2020-09-06.0000000 |
| e |
0.97788684 |
| q (au) |
1.314974 |
| a (au) |
59.465667 |
| i (deg) |
142.923814 |
| Ω (om, deg) |
52.379273 |
| ω (w, deg) |
9.884895 |
| M (ma, deg) |
0.048020 |
Magnitude
Scatter + Global Linear
$$
M_a = (15.650 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
15.650 |
| n |
6.000 |
| gf |
0.997 |
| gb |
-1.000 |
| 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) |
| 2026-05-12 00:00 |
16:43:20.63 |
-08:58:41.0 |
HIP 81843 |
5.04 |
| 2026-05-12 12:00 |
16:43:12.76 |
-08:58:23.3 |
HIP 81843 |
3.12 |
| 2026-05-13 00:00 |
16:43:04.87 |
-08:58:05.8 |
HIP 81843 |
1.35 |
| 2026-05-13 12:00 |
16:42:56.96 |
-08:57:48.3 |
HIP 81843 |
1.30 |
| 2026-05-14 00:00 |
16:42:49.02 |
-08:57:31.1 |
HIP 81843 |
3.07 |
| 2026-05-14 12:00 |
16:42:41.06 |
-08:57:14.0 |
HIP 81843 |
5.00 |
| 2026-05-15 00:00 |
16:42:33.08 |
-08:56:57.1 |
HIP 81843 |
6.97 |
| 2026-05-15 12:00 |
16:42:25.08 |
-08:56:40.3 |
HIP 81843 |
8.96 |
| 2026-05-16 00:00 |
16:42:17.06 |
-08:56:23.7 |
HIP 81843 |
10.95 |
| 2026-05-16 12:00 |
16:42:09.02 |
-08:56:07.3 |
HIP 81843 |
12.95 |
| 2026-05-17 00:00 |
16:42:00.96 |
-08:55:51.0 |
HIP 81843 |
14.95 |
| 2026-05-17 12:00 |
16:41:52.88 |
-08:55:34.9 |
HIP 81843 |
16.96 |
| 2026-05-18 00:00 |
16:41:44.79 |
-08:55:19.0 |
HIP 81843 |
18.98 |
| 2026-05-18 12:00 |
16:41:36.68 |
-08:55:03.2 |
HIP 81843 |
21.00 |
| 2026-05-19 00:00 |
16:41:28.56 |
-08:54:47.7 |
HIP 81843 |
23.02 |
| 2026-05-19 12:00 |
16:41:20.42 |
-08:54:32.3 |
HIP 81843 |
25.05 |
| 2026-05-20 00:00 |
16:41:12.27 |
-08:54:17.1 |
HIP 81843 |
27.07 |
| 2026-05-20 12:00 |
16:41:04.10 |
-08:54:02.1 |
HIP 81843 |
29.11 |
| 2026-05-21 00:00 |
16:40:55.92 |
-08:53:47.2 |
HIP 81843 |
31.14 |
| 2026-05-21 12:00 |
16:40:47.73 |
-08:53:32.6 |
HIP 81843 |
33.18 |
| 2026-05-22 00:00 |
16:40:39.53 |
-08:53:18.1 |
HIP 81499 |
32.02 |
| 2026-05-22 12:00 |
16:40:31.31 |
-08:53:03.8 |
HIP 81499 |
30.16 |
| 2026-05-23 00:00 |
16:40:23.09 |
-08:52:49.7 |
HIP 81499 |
28.32 |
| 2026-05-23 12:00 |
16:40:14.86 |
-08:52:35.8 |
HIP 81499 |
26.52 |
| 2026-05-24 00:00 |
16:40:06.62 |
-08:52:22.1 |
HIP 81499 |
24.75 |
| 2026-05-24 12:00 |
16:39:58.37 |
-08:52:08.6 |
HIP 81499 |
23.03 |
| 2026-05-25 00:00 |
16:39:50.11 |
-08:51:55.3 |
HIP 81499 |
21.37 |
| 2026-05-25 12:00 |
16:39:41.85 |
-08:51:42.1 |
HIP 81499 |
19.79 |
| 2026-05-26 00:00 |
16:39:33.58 |
-08:51:29.2 |
HIP 81499 |
18.30 |
| 2026-05-26 12:00 |
16:39:25.30 |
-08:51:16.4 |
HIP 81499 |
16.93 |
| 2026-05-27 00:00 |
16:39:17.02 |
-08:51:03.9 |
HIP 81499 |
15.72 |
| 2026-05-27 12:00 |
16:39:08.74 |
-08:50:51.6 |
HIP 81499 |
14.69 |
| 2026-05-28 00:00 |
16:39:00.45 |
-08:50:39.4 |
HIP 81499 |
13.90 |
| 2026-05-28 12:00 |
16:38:52.16 |
-08:50:27.5 |
HIP 81499 |
13.39 |
| 2026-05-29 00:00 |
16:38:43.87 |
-08:50:15.7 |
HIP 81499 |
13.18 |
| 2026-05-29 12:00 |
16:38:35.57 |
-08:50:04.2 |
HIP 81499 |
13.30 |
| 2026-05-30 00:00 |
16:38:27.28 |
-08:49:52.9 |
HIP 81499 |
13.73 |
| 2026-05-30 12:00 |
16:38:18.98 |
-08:49:41.8 |
HIP 81499 |
14.45 |
| 2026-05-31 00:00 |
16:38:10.68 |
-08:49:30.9 |
HIP 81499 |
15.41 |
| 2026-05-31 12:00 |
16:38:02.39 |
-08:49:20.1 |
HIP 81499 |
16.58 |
| 2026-06-01 00:00 |
16:37:54.10 |
-08:49:09.6 |
HIP 81360 |
14.89 |
| 2026-06-01 12:00 |
16:37:45.80 |
-08:48:59.4 |
HIP 81360 |
12.99 |
| 2026-06-02 00:00 |
16:37:37.52 |
-08:48:49.3 |
HIP 81360 |
11.13 |