| Parameter |
Value |
| Designation |
C/2024 V1 (Borisov) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2025-04-04T02:28:15.268800Z |
| Orbit solution date (soln_date, UTC) |
2025-06-26T10:13:10Z |
| Obs used |
422 |
| NEO |
- |
| M1 |
13.600 |
| K1 |
9.250 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2024-11-08T01:11:04.704000Z |
| Discovery magnitude (MPC) |
19.30 G |
| Discovery observatory (MPC) |
L51 · MARGO, Nauchnyi |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2025-02-14.0000000 |
| e |
0.99016034 |
| q (au) |
2.318468 |
| a (au) |
235.624767 |
| i (deg) |
54.623265 |
| Ω (om, deg) |
328.195162 |
| ω (w, deg) |
168.663803 |
| M (ma, deg) |
359.986619 |
Magnitude
Scatter + Global Linear
$$
M_a = (14.076 + 4.289\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
14.076 |
| n |
4.289 |
| gf |
1.000 |
| gb |
-0.585 |
| 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) |
| 2026-07-29 00:00 |
11:39:18.89 |
-61:51:57.3 |
HIP 56754 |
8.76 |
| 2026-07-29 12:00 |
11:39:58.11 |
-61:51:14.5 |
HIP 56754 |
13.17 |
| 2026-07-30 00:00 |
11:40:37.46 |
-61:50:33.2 |
HIP 56986 |
14.97 |
| 2026-07-30 12:00 |
11:41:16.93 |
-61:49:53.4 |
HIP 56986 |
15.76 |
| 2026-07-31 00:00 |
11:41:56.51 |
-61:49:14.9 |
HIP 56986 |
17.77 |
| 2026-07-31 12:00 |
11:42:36.22 |
-61:48:37.9 |
HIP 56986 |
20.66 |
| 2026-08-01 00:00 |
11:43:16.04 |
-61:48:02.3 |
HIP 57316 |
21.41 |
| 2026-08-01 12:00 |
11:43:55.97 |
-61:47:28.0 |
HIP 57316 |
18.40 |
| 2026-08-02 00:00 |
11:44:36.02 |
-61:46:55.2 |
HIP 57316 |
16.27 |
| 2026-08-02 12:00 |
11:45:16.18 |
-61:46:23.9 |
HIP 57476 |
12.56 |
| 2026-08-03 00:00 |
11:45:56.46 |
-61:45:53.9 |
HIP 57476 |
8.04 |
| 2026-08-03 12:00 |
11:46:36.85 |
-61:45:25.2 |
HIP 57476 |
4.21 |
| 2026-08-04 00:00 |
11:47:17.35 |
-61:44:58.0 |
HIP 57476 |
4.15 |
| 2026-08-04 12:00 |
11:47:57.96 |
-61:44:32.2 |
HIP 57476 |
7.96 |
| 2026-08-05 00:00 |
11:48:38.68 |
-61:44:07.8 |
HIP 57610 |
10.29 |
| 2026-08-05 12:00 |
11:49:19.51 |
-61:43:44.7 |
HIP 57610 |
10.88 |
| 2026-08-06 00:00 |
11:50:00.45 |
-61:43:23.0 |
HIP 57808 |
11.32 |
| 2026-08-06 12:00 |
11:50:41.50 |
-61:43:02.7 |
HIP 57808 |
8.57 |
| 2026-08-07 00:00 |
11:51:22.65 |
-61:42:43.8 |
HIP 57808 |
8.12 |
| 2026-08-07 12:00 |
11:52:03.92 |
-61:42:26.2 |
HIP 57808 |
10.28 |
| 2026-08-08 00:00 |
11:52:45.28 |
-61:42:10.0 |
HIP 57895 |
10.90 |
| 2026-08-08 12:00 |
11:53:26.76 |
-61:41:55.1 |
HIP 57895 |
12.54 |
| 2026-08-09 00:00 |
11:54:08.34 |
-61:41:41.7 |
HIP 57895 |
15.65 |
| 2026-08-09 12:00 |
11:54:50.02 |
-61:41:29.5 |
HIP 57895 |
19.57 |
| 2026-08-10 00:00 |
11:55:31.80 |
-61:41:18.8 |
HIP 57895 |
23.89 |
| 2026-08-10 12:00 |
11:56:13.69 |
-61:41:09.3 |
HIP 58468 |
24.68 |
| 2026-08-11 00:00 |
11:56:55.68 |
-61:41:01.3 |
HIP 58468 |
20.30 |
| 2026-08-11 12:00 |
11:57:37.77 |
-61:40:54.5 |
HIP 58468 |
16.22 |
| 2026-08-12 00:00 |
11:58:19.96 |
-61:40:49.1 |
HIP 58468 |
12.78 |
| 2026-08-12 12:00 |
11:59:02.25 |
-61:40:45.1 |
HIP 58468 |
10.63 |
| 2026-08-13 00:00 |
11:59:44.64 |
-61:40:42.3 |
HIP 58468 |
10.59 |
| 2026-08-13 12:00 |
12:00:27.12 |
-61:40:40.9 |
HIP 58468 |
12.70 |
| 2026-08-14 00:00 |
12:01:09.70 |
-61:40:40.8 |
HIP 58468 |
16.14 |
| 2026-08-14 12:00 |
12:01:52.37 |
-61:40:42.1 |
HIP 58563 |
19.30 |
| 2026-08-15 00:00 |
12:02:35.14 |
-61:40:44.6 |
HIP 58563 |
22.36 |
| 2026-08-15 12:00 |
12:03:18.01 |
-61:40:48.5 |
HIP 58909 |
21.43 |
| 2026-08-16 00:00 |
12:04:00.96 |
-61:40:53.6 |
HIP 58909 |
19.34 |
| 2026-08-16 12:00 |
12:04:44.01 |
-61:41:00.1 |
HIP 58909 |
18.42 |
| 2026-08-17 00:00 |
12:05:27.15 |
-61:41:07.8 |
HIP 58909 |
18.86 |
| 2026-08-17 12:00 |
12:06:10.37 |
-61:41:16.8 |
HIP 58909 |
20.57 |
| 2026-08-18 00:00 |
12:06:53.69 |
-61:41:27.1 |
HIP 58909 |
23.29 |
| 2026-08-18 12:00 |
12:07:37.10 |
-61:41:38.7 |
HIP 59101 |
25.96 |
| 2026-08-19 00:00 |
12:08:20.59 |
-61:41:51.5 |
HIP 59101 |
27.28 |