| 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
$$
M_a = (13.194 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
13.194 |
| n |
2.000 |
| gf |
0.995 |
| gb |
-1.000 |
| k |
1.000 |
| δ90 |
9.982 |
| 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) |
| 2026-03-26 00:00 |
17:42:17.63 |
-21:35:18.8 |
HIP 86736 |
16.84 |
| 2026-03-26 12:00 |
17:42:16.83 |
-21:35:31.5 |
HIP 86736 |
16.94 |
| 2026-03-27 00:00 |
17:42:15.96 |
-21:35:44.2 |
HIP 86736 |
17.07 |
| 2026-03-27 12:00 |
17:42:15.02 |
-21:35:56.9 |
HIP 86736 |
17.21 |
| 2026-03-28 00:00 |
17:42:14.01 |
-21:36:09.6 |
HIP 86736 |
17.38 |
| 2026-03-28 12:00 |
17:42:12.93 |
-21:36:22.3 |
HIP 86736 |
17.56 |
| 2026-03-29 00:00 |
17:42:11.77 |
-21:36:34.9 |
HIP 86736 |
17.77 |
| 2026-03-29 12:00 |
17:42:10.54 |
-21:36:47.5 |
HIP 86736 |
17.99 |
| 2026-03-30 00:00 |
17:42:09.25 |
-21:37:00.2 |
HIP 86736 |
18.24 |
| 2026-03-30 12:00 |
17:42:07.88 |
-21:37:12.8 |
HIP 86736 |
18.51 |
| 2026-03-31 00:00 |
17:42:06.44 |
-21:37:25.4 |
HIP 86736 |
18.79 |
| 2026-03-31 12:00 |
17:42:04.93 |
-21:37:37.9 |
HIP 86736 |
19.10 |
| 2026-04-01 00:00 |
17:42:03.35 |
-21:37:50.5 |
HIP 86736 |
19.43 |
| 2026-04-01 12:00 |
17:42:01.69 |
-21:38:03.0 |
HIP 86736 |
19.77 |
| 2026-04-02 00:00 |
17:41:59.97 |
-21:38:15.6 |
HIP 86736 |
20.14 |
| 2026-04-02 12:00 |
17:41:58.18 |
-21:38:28.1 |
HIP 86736 |
20.53 |
| 2026-04-03 00:00 |
17:41:56.31 |
-21:38:40.6 |
HIP 86736 |
20.93 |
| 2026-04-03 12:00 |
17:41:54.38 |
-21:38:53.1 |
HIP 86736 |
21.36 |
| 2026-04-04 00:00 |
17:41:52.37 |
-21:39:05.6 |
HIP 86736 |
21.80 |
| 2026-04-04 12:00 |
17:41:50.30 |
-21:39:18.0 |
HIP 86736 |
22.26 |
| 2026-04-05 00:00 |
17:41:48.15 |
-21:39:30.5 |
HIP 86736 |
22.75 |
| 2026-04-05 12:00 |
17:41:45.94 |
-21:39:42.9 |
HIP 86736 |
23.25 |
| 2026-04-06 00:00 |
17:41:43.66 |
-21:39:55.3 |
HIP 86736 |
23.77 |
| 2026-04-06 12:00 |
17:41:41.30 |
-21:40:07.7 |
HIP 86736 |
24.31 |
| 2026-04-07 00:00 |
17:41:38.88 |
-21:40:20.1 |
HIP 86736 |
24.86 |
| 2026-04-07 12:00 |
17:41:36.39 |
-21:40:32.5 |
HIP 86736 |
25.44 |
| 2026-04-08 00:00 |
17:41:33.82 |
-21:40:44.9 |
HIP 86736 |
26.03 |
| 2026-04-08 12:00 |
17:41:31.19 |
-21:40:57.2 |
HIP 86736 |
26.64 |
| 2026-04-09 00:00 |
17:41:28.49 |
-21:41:09.6 |
HIP 86736 |
27.26 |
| 2026-04-09 12:00 |
17:41:25.72 |
-21:41:21.9 |
HIP 86736 |
27.91 |
| 2026-04-10 00:00 |
17:41:22.89 |
-21:41:34.2 |
HIP 86736 |
28.57 |
| 2026-04-10 12:00 |
17:41:19.98 |
-21:41:46.5 |
HIP 86736 |
29.25 |
| 2026-04-11 00:00 |
17:41:17.01 |
-21:41:58.8 |
HIP 86736 |
29.95 |
| 2026-04-11 12:00 |
17:41:13.97 |
-21:42:11.1 |
HIP 86736 |
30.66 |
| 2026-04-12 00:00 |
17:41:10.86 |
-21:42:23.4 |
HIP 86736 |
31.39 |
| 2026-04-12 12:00 |
17:41:07.68 |
-21:42:35.6 |
HIP 86736 |
32.14 |
| 2026-04-13 00:00 |
17:41:04.43 |
-21:42:47.9 |
HIP 86736 |
32.90 |
| 2026-04-13 12:00 |
17:41:01.12 |
-21:43:00.1 |
HIP 86736 |
33.68 |
| 2026-04-14 00:00 |
17:40:57.74 |
-21:43:12.3 |
HIP 86352 |
32.93 |
| 2026-04-14 12:00 |
17:40:54.30 |
-21:43:24.5 |
HIP 86352 |
32.11 |
| 2026-04-15 00:00 |
17:40:50.79 |
-21:43:36.7 |
HIP 86352 |
31.28 |
| 2026-04-15 12:00 |
17:40:47.21 |
-21:43:48.9 |
HIP 86352 |
30.43 |
| 2026-04-16 00:00 |
17:40:43.56 |
-21:44:01.0 |
HIP 86352 |
29.57 |