| 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) |
| 2026-07-29 00:00 |
17:17:40.53 |
-22:22:29.7 |
HIP 84543 |
10.94 |
| 2026-07-29 12:00 |
17:17:35.48 |
-22:22:41.3 |
HIP 84543 |
9.85 |
| 2026-07-30 00:00 |
17:17:30.48 |
-22:22:53.0 |
HIP 84543 |
8.79 |
| 2026-07-30 12:00 |
17:17:25.54 |
-22:23:04.8 |
HIP 84543 |
7.78 |
| 2026-07-31 00:00 |
17:17:20.66 |
-22:23:16.6 |
HIP 84543 |
6.81 |
| 2026-07-31 12:00 |
17:17:15.83 |
-22:23:28.4 |
HIP 84543 |
5.92 |
| 2026-08-01 00:00 |
17:17:11.06 |
-22:23:40.3 |
HIP 84543 |
5.13 |
| 2026-08-01 12:00 |
17:17:06.34 |
-22:23:52.1 |
HIP 84543 |
4.49 |
| 2026-08-02 00:00 |
17:17:01.68 |
-22:24:04.1 |
HIP 84543 |
4.06 |
| 2026-08-02 12:00 |
17:16:57.08 |
-22:24:16.1 |
HIP 84543 |
3.89 |
| 2026-08-03 00:00 |
17:16:52.54 |
-22:24:28.1 |
HIP 84543 |
4.01 |
| 2026-08-03 12:00 |
17:16:48.05 |
-22:24:40.1 |
HIP 84543 |
4.39 |
| 2026-08-04 00:00 |
17:16:43.63 |
-22:24:52.2 |
HIP 84543 |
4.96 |
| 2026-08-04 12:00 |
17:16:39.26 |
-22:25:04.3 |
HIP 84543 |
5.65 |
| 2026-08-05 00:00 |
17:16:34.95 |
-22:25:16.5 |
HIP 84543 |
6.42 |
| 2026-08-05 12:00 |
17:16:30.70 |
-22:25:28.7 |
HIP 84543 |
7.24 |
| 2026-08-06 00:00 |
17:16:26.50 |
-22:25:41.0 |
HIP 84543 |
8.08 |
| 2026-08-06 12:00 |
17:16:22.37 |
-22:25:53.3 |
HIP 84543 |
8.94 |
| 2026-08-07 00:00 |
17:16:18.30 |
-22:26:05.6 |
HIP 84543 |
9.81 |
| 2026-08-07 12:00 |
17:16:14.29 |
-22:26:18.0 |
HIP 84543 |
10.69 |
| 2026-08-08 00:00 |
17:16:10.34 |
-22:26:30.4 |
HIP 84543 |
11.56 |
| 2026-08-08 12:00 |
17:16:06.45 |
-22:26:42.9 |
HIP 84543 |
12.42 |
| 2026-08-09 00:00 |
17:16:02.62 |
-22:26:55.4 |
HIP 84543 |
13.28 |
| 2026-08-09 12:00 |
17:15:58.85 |
-22:27:08.0 |
HIP 84543 |
14.13 |
| 2026-08-10 00:00 |
17:15:55.15 |
-22:27:20.6 |
HIP 84543 |
14.97 |
| 2026-08-10 12:00 |
17:15:51.50 |
-22:27:33.2 |
HIP 84543 |
15.80 |
| 2026-08-11 00:00 |
17:15:47.92 |
-22:27:45.9 |
HIP 84543 |
16.63 |
| 2026-08-11 12:00 |
17:15:44.40 |
-22:27:58.7 |
HIP 84543 |
17.43 |
| 2026-08-12 00:00 |
17:15:40.95 |
-22:28:11.5 |
HIP 84543 |
18.23 |
| 2026-08-12 12:00 |
17:15:37.56 |
-22:28:24.3 |
HIP 84543 |
19.02 |
| 2026-08-13 00:00 |
17:15:34.23 |
-22:28:37.2 |
HIP 84543 |
19.79 |
| 2026-08-13 12:00 |
17:15:30.97 |
-22:28:50.1 |
HIP 84543 |
20.55 |
| 2026-08-14 00:00 |
17:15:27.77 |
-22:29:03.1 |
HIP 84299 |
19.86 |
| 2026-08-14 12:00 |
17:15:24.63 |
-22:29:16.1 |
HIP 84299 |
19.11 |
| 2026-08-15 00:00 |
17:15:21.56 |
-22:29:29.2 |
HIP 84299 |
18.37 |
| 2026-08-15 12:00 |
17:15:18.55 |
-22:29:42.3 |
HIP 84299 |
17.64 |
| 2026-08-16 00:00 |
17:15:15.61 |
-22:29:55.5 |
HIP 84299 |
16.92 |
| 2026-08-16 12:00 |
17:15:12.73 |
-22:30:08.7 |
HIP 84299 |
16.22 |
| 2026-08-17 00:00 |
17:15:09.92 |
-22:30:22.0 |
HIP 84299 |
15.54 |
| 2026-08-17 12:00 |
17:15:07.17 |
-22:30:35.3 |
HIP 84299 |
14.87 |
| 2026-08-18 00:00 |
17:15:04.49 |
-22:30:48.7 |
HIP 84299 |
14.21 |
| 2026-08-18 12:00 |
17:15:01.87 |
-22:31:02.1 |
HIP 84299 |
13.57 |
| 2026-08-19 00:00 |
17:14:59.32 |
-22:31:15.6 |
HIP 84299 |
12.94 |