| 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 |
1.000 |
| 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) |
| 2026-06-01 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 |
| 2026-06-02 12:00 |
16:37:29.23 |
-08:48:39.4 |
HIP 81360 |
9.37 |
| 2026-06-03 00:00 |
16:37:20.95 |
-08:48:29.8 |
HIP 81360 |
7.74 |
| 2026-06-03 12:00 |
16:37:12.67 |
-08:48:20.4 |
HIP 81360 |
6.36 |
| 2026-06-04 00:00 |
16:37:04.40 |
-08:48:11.1 |
HIP 81360 |
5.42 |
| 2026-06-04 12:00 |
16:36:56.13 |
-08:48:02.1 |
HIP 81360 |
5.16 |
| 2026-06-05 00:00 |
16:36:47.87 |
-08:47:53.4 |
HIP 81318 |
5.27 |
| 2026-06-05 12:00 |
16:36:39.62 |
-08:47:44.8 |
HIP 81318 |
4.04 |
| 2026-06-06 00:00 |
16:36:31.38 |
-08:47:36.5 |
HIP 81318 |
3.63 |
| 2026-06-06 12:00 |
16:36:23.14 |
-08:47:28.3 |
HIP 81318 |
4.29 |
| 2026-06-07 00:00 |
16:36:14.91 |
-08:47:20.4 |
HIP 81318 |
5.64 |
| 2026-06-07 12:00 |
16:36:06.69 |
-08:47:12.8 |
HIP 81318 |
7.32 |
| 2026-06-08 00:00 |
16:35:58.49 |
-08:47:05.3 |
HIP 81318 |
9.13 |
| 2026-06-08 12:00 |
16:35:50.29 |
-08:46:58.1 |
HIP 81318 |
11.02 |
| 2026-06-09 00:00 |
16:35:42.10 |
-08:46:51.1 |
HIP 81318 |
12.95 |
| 2026-06-09 12:00 |
16:35:33.93 |
-08:46:44.3 |
HIP 81318 |
14.90 |
| 2026-06-10 00:00 |
16:35:25.77 |
-08:46:37.8 |
HIP 81318 |
16.86 |
| 2026-06-10 12:00 |
16:35:17.62 |
-08:46:31.5 |
HIP 81318 |
18.83 |
| 2026-06-11 00:00 |
16:35:09.48 |
-08:46:25.4 |
HIP 81318 |
20.81 |
| 2026-06-11 12:00 |
16:35:01.37 |
-08:46:19.5 |
HIP 81318 |
22.78 |
| 2026-06-12 00:00 |
16:34:53.26 |
-08:46:13.9 |
HIP 81318 |
24.76 |
| 2026-06-12 12:00 |
16:34:45.17 |
-08:46:08.5 |
HIP 81318 |
26.74 |
| 2026-06-13 00:00 |
16:34:37.10 |
-08:46:03.4 |
HIP 81318 |
28.71 |
| 2026-06-13 12:00 |
16:34:29.05 |
-08:45:58.5 |
HIP 81318 |
30.69 |
| 2026-06-14 00:00 |
16:34:21.01 |
-08:45:53.8 |
HIP 81318 |
32.66 |
| 2026-06-14 12:00 |
16:34:12.99 |
-08:45:49.3 |
HIP 81318 |
34.62 |
| 2026-06-15 00:00 |
16:34:04.99 |
-08:45:45.1 |
HIP 81318 |
36.59 |
| 2026-06-15 12:00 |
16:33:57.02 |
-08:45:41.2 |
HIP 81159 |
37.83 |
| 2026-06-16 00:00 |
16:33:49.06 |
-08:45:37.4 |
HIP 81159 |
38.29 |
| 2026-06-16 12:00 |
16:33:41.12 |
-08:45:34.0 |
HIP 81159 |
38.85 |
| 2026-06-17 00:00 |
16:33:33.21 |
-08:45:30.7 |
HIP 81159 |
39.50 |
| 2026-06-17 12:00 |
16:33:25.31 |
-08:45:27.7 |
HIP 81159 |
40.23 |
| 2026-06-18 00:00 |
16:33:17.44 |
-08:45:24.9 |
HIP 81159 |
41.05 |
| 2026-06-18 12:00 |
16:33:09.60 |
-08:45:22.4 |
HIP 80873 |
40.33 |
| 2026-06-19 00:00 |
16:33:01.78 |
-08:45:20.1 |
HIP 80873 |
38.70 |
| 2026-06-19 12:00 |
16:32:53.98 |
-08:45:18.1 |
HIP 80873 |
37.11 |
| 2026-06-20 00:00 |
16:32:46.21 |
-08:45:16.3 |
HIP 80873 |
35.55 |
| 2026-06-20 12:00 |
16:32:38.46 |
-08:45:14.7 |
HIP 80873 |
34.03 |
| 2026-06-21 00:00 |
16:32:30.75 |
-08:45:13.4 |
HIP 80873 |
32.56 |
| 2026-06-21 12:00 |
16:32:23.06 |
-08:45:12.3 |
HIP 80873 |
31.13 |
| 2026-06-22 00:00 |
16:32:15.39 |
-08:45:11.5 |
HIP 80873 |
29.76 |