| Parameter |
Value |
| Designation |
C/2019 V1 (Borisov) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2020-07-16T14:09:27.541440Z |
| Orbit solution date (soln_date, UTC) |
2022-07-06T03:12:23Z |
| Obs used |
111 |
| NEO |
- |
| M1 |
14.500 |
| K1 |
4.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2019-11-01T23:39:17.568000Z |
| Discovery magnitude (MPC) |
19.00 R |
| Discovery observatory (MPC) |
L51 · MARGO, Nauchnyi |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2019-11-26.0000000 |
| e |
0.99902392 |
| q (au) |
3.097057 |
| a (au) |
3172.941013 |
| i (deg) |
61.867108 |
| Ω (om, deg) |
83.206671 |
| ω (w, deg) |
51.207673 |
| M (ma, deg) |
359.998712 |
Magnitude
Scatter + Global Linear
$$
M_a = (13.144 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
13.144 |
| n |
2.000 |
| gf |
0.982 |
| gb |
-0.862 |
| 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) |
| 2026-06-01 00:00 |
17:31:24.23 |
-22:01:42.0 |
HIP 85925 |
31.39 |
| 2026-06-01 12:00 |
17:31:16.51 |
-22:01:52.8 |
HIP 85724 |
32.90 |
| 2026-06-02 00:00 |
17:31:08.77 |
-22:02:03.7 |
HIP 85724 |
32.97 |
| 2026-06-02 12:00 |
17:31:01.01 |
-22:02:14.5 |
HIP 85724 |
33.13 |
| 2026-06-03 00:00 |
17:30:53.25 |
-22:02:25.3 |
HIP 85724 |
33.39 |
| 2026-06-03 12:00 |
17:30:45.47 |
-22:02:36.1 |
HIP 85724 |
33.75 |
| 2026-06-04 00:00 |
17:30:37.67 |
-22:02:46.8 |
HIP 85724 |
34.19 |
| 2026-06-04 12:00 |
17:30:29.87 |
-22:02:57.6 |
HIP 85724 |
34.73 |
| 2026-06-05 00:00 |
17:30:22.05 |
-22:03:08.4 |
HIP 85724 |
35.36 |
| 2026-06-05 12:00 |
17:30:14.22 |
-22:03:19.1 |
HIP 85724 |
36.06 |
| 2026-06-06 00:00 |
17:30:06.38 |
-22:03:29.8 |
HIP 85724 |
36.85 |
| 2026-06-06 12:00 |
17:29:58.54 |
-22:03:40.5 |
HIP 85526 |
35.92 |
| 2026-06-07 00:00 |
17:29:50.68 |
-22:03:51.2 |
HIP 85526 |
34.90 |
| 2026-06-07 12:00 |
17:29:42.82 |
-22:04:01.9 |
HIP 85526 |
33.95 |
| 2026-06-08 00:00 |
17:29:34.95 |
-22:04:12.6 |
HIP 85526 |
33.06 |
| 2026-06-08 12:00 |
17:29:27.07 |
-22:04:23.3 |
HIP 85526 |
32.26 |
| 2026-06-09 00:00 |
17:29:19.19 |
-22:04:33.9 |
HIP 85526 |
31.54 |
| 2026-06-09 12:00 |
17:29:11.30 |
-22:04:44.5 |
HIP 85526 |
30.91 |
| 2026-06-10 00:00 |
17:29:03.41 |
-22:04:55.2 |
HIP 85526 |
30.38 |
| 2026-06-10 12:00 |
17:28:55.51 |
-22:05:05.8 |
HIP 85526 |
29.96 |
| 2026-06-11 00:00 |
17:28:47.61 |
-22:05:16.4 |
HIP 85526 |
29.64 |
| 2026-06-11 12:00 |
17:28:39.71 |
-22:05:27.0 |
HIP 85526 |
29.43 |
| 2026-06-12 00:00 |
17:28:31.81 |
-22:05:37.6 |
HIP 85526 |
29.34 |
| 2026-06-12 12:00 |
17:28:23.90 |
-22:05:48.2 |
HIP 85526 |
29.36 |
| 2026-06-13 00:00 |
17:28:16.00 |
-22:05:58.8 |
HIP 85526 |
29.50 |
| 2026-06-13 12:00 |
17:28:08.10 |
-22:06:09.3 |
HIP 85526 |
29.75 |
| 2026-06-14 00:00 |
17:28:00.20 |
-22:06:19.9 |
HIP 85526 |
30.11 |
| 2026-06-14 12:00 |
17:27:52.30 |
-22:06:30.4 |
HIP 85526 |
30.57 |
| 2026-06-15 00:00 |
17:27:44.40 |
-22:06:41.0 |
HIP 85526 |
31.14 |
| 2026-06-15 12:00 |
17:27:36.51 |
-22:06:51.5 |
HIP 85526 |
31.80 |
| 2026-06-16 00:00 |
17:27:28.62 |
-22:07:02.1 |
HIP 85526 |
32.56 |
| 2026-06-16 12:00 |
17:27:20.74 |
-22:07:12.6 |
HIP 85247 |
32.82 |
| 2026-06-17 00:00 |
17:27:12.87 |
-22:07:23.1 |
HIP 85247 |
31.24 |
| 2026-06-17 12:00 |
17:27:05.00 |
-22:07:33.6 |
HIP 85247 |
29.69 |
| 2026-06-18 00:00 |
17:26:57.14 |
-22:07:44.1 |
HIP 85247 |
28.18 |
| 2026-06-18 12:00 |
17:26:49.29 |
-22:07:54.6 |
HIP 85247 |
26.71 |
| 2026-06-19 00:00 |
17:26:41.44 |
-22:08:05.1 |
HIP 85247 |
25.29 |
| 2026-06-19 12:00 |
17:26:33.61 |
-22:08:15.6 |
HIP 85247 |
23.92 |
| 2026-06-20 00:00 |
17:26:25.79 |
-22:08:26.1 |
HIP 85247 |
22.62 |
| 2026-06-20 12:00 |
17:26:17.98 |
-22:08:36.6 |
HIP 85247 |
21.40 |
| 2026-06-21 00:00 |
17:26:10.18 |
-22:08:47.1 |
HIP 85247 |
20.27 |
| 2026-06-21 12:00 |
17:26:02.39 |
-22:08:57.6 |
HIP 85247 |
19.25 |
| 2026-06-22 00:00 |
17:25:54.62 |
-22:09:08.1 |
HIP 85247 |
18.35 |