C/2023 F2 (SOHO)
| Parameter |
Value |
| Designation |
C/2023 F2 (SOHO) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2023-03-21T03:59:23.654400Z |
| Orbit solution date (soln_date, UTC) |
2025-02-28T10:03:47Z |
| Obs used |
82 |
| NEO |
- |
| M1 |
20.800 |
| K1 |
10.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2023-03-21T00:06:17.568000Z |
| Discovery magnitude (MPC) |
4.90 V |
| Discovery observatory (MPC) |
249 · SOHO |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2023-03-21.0000000 |
| e |
1.01189649 |
| q (au) |
0.034240 |
| a (au) |
-2.878182 |
| i (deg) |
72.567452 |
| Ω (om, deg) |
71.422437 |
| ω (w, deg) |
57.765098 |
| M (ma, deg) |
-0.033557 |
Magnitude
Scatter + Global Linear
$$
M_a = (20.000 + 3.781\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
20.000 |
| n |
3.781 |
| gf |
0.800 |
| gb |
-1.000 |
| k |
0.800 |
| δ90 |
1.000 |
| 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) |
| 2026-02-03 00:00 |
18:20:58.52 |
-66:09:44.1 |
HIP 89886 |
5.90 |
| 2026-02-03 12:00 |
18:21:12.83 |
-66:10:34.6 |
HIP 89886 |
7.42 |
| 2026-02-04 00:00 |
18:21:27.06 |
-66:11:25.6 |
HIP 90049 |
8.20 |
| 2026-02-04 12:00 |
18:21:41.19 |
-66:12:17.0 |
HIP 90049 |
7.78 |
| 2026-02-05 00:00 |
18:21:55.23 |
-66:13:08.8 |
HIP 90049 |
7.71 |
| 2026-02-05 12:00 |
18:22:09.18 |
-66:14:01.1 |
HIP 90049 |
8.01 |
| 2026-02-06 00:00 |
18:22:23.03 |
-66:14:53.8 |
HIP 90049 |
8.63 |
| 2026-02-06 12:00 |
18:22:36.79 |
-66:15:47.0 |
HIP 90049 |
9.51 |
| 2026-02-07 00:00 |
18:22:50.45 |
-66:16:40.6 |
HIP 90049 |
10.58 |
| 2026-02-07 12:00 |
18:23:04.01 |
-66:17:34.6 |
HIP 90049 |
11.78 |
| 2026-02-08 00:00 |
18:23:17.48 |
-66:18:29.1 |
HIP 90049 |
13.09 |
| 2026-02-08 12:00 |
18:23:30.85 |
-66:19:24.0 |
HIP 90049 |
14.46 |
| 2026-02-09 00:00 |
18:23:44.11 |
-66:20:19.3 |
HIP 90049 |
15.88 |
| 2026-02-09 12:00 |
18:23:57.28 |
-66:21:15.0 |
HIP 90049 |
17.34 |
| 2026-02-10 00:00 |
18:24:10.35 |
-66:22:11.2 |
HIP 90049 |
18.82 |
| 2026-02-10 12:00 |
18:24:23.31 |
-66:23:07.8 |
HIP 90346 |
19.05 |
| 2026-02-11 00:00 |
18:24:36.17 |
-66:24:04.8 |
HIP 90346 |
17.58 |
| 2026-02-11 12:00 |
18:24:48.92 |
-66:25:02.3 |
HIP 90346 |
16.14 |
| 2026-02-12 00:00 |
18:25:01.57 |
-66:26:00.1 |
HIP 90346 |
14.73 |
| 2026-02-12 12:00 |
18:25:14.11 |
-66:26:58.4 |
HIP 90346 |
13.35 |
| 2026-02-13 00:00 |
18:25:26.55 |
-66:27:57.1 |
HIP 90346 |
12.02 |
| 2026-02-13 12:00 |
18:25:38.88 |
-66:28:56.1 |
HIP 90346 |
10.75 |
| 2026-02-14 00:00 |
18:25:51.09 |
-66:29:55.6 |
HIP 90346 |
9.57 |
| 2026-02-14 12:00 |
18:26:03.20 |
-66:30:55.5 |
HIP 90346 |
8.51 |
| 2026-02-15 00:00 |
18:26:15.20 |
-66:31:55.9 |
HIP 90346 |
7.61 |
| 2026-02-15 12:00 |
18:26:27.08 |
-66:32:56.6 |
HIP 90346 |
6.94 |
| 2026-02-16 00:00 |
18:26:38.85 |
-66:33:57.7 |
HIP 90346 |
6.57 |
| 2026-02-16 12:00 |
18:26:50.51 |
-66:34:59.2 |
HIP 90346 |
6.53 |
| 2026-02-17 00:00 |
18:27:02.05 |
-66:36:01.1 |
HIP 90346 |
6.84 |
| 2026-02-17 12:00 |
18:27:13.47 |
-66:37:03.3 |
HIP 90346 |
7.45 |
| 2026-02-18 00:00 |
18:27:24.78 |
-66:38:06.0 |
HIP 90346 |
8.28 |
| 2026-02-18 12:00 |
18:27:35.97 |
-66:39:09.1 |
HIP 90346 |
9.29 |
| 2026-02-19 00:00 |
18:27:47.04 |
-66:40:12.5 |
HIP 90346 |
10.40 |
| 2026-02-19 12:00 |
18:27:57.99 |
-66:41:16.3 |
HIP 90346 |
11.60 |
| 2026-02-20 00:00 |
18:28:08.82 |
-66:42:20.5 |
HIP 90346 |
12.86 |
| 2026-02-20 12:00 |
18:28:19.53 |
-66:43:25.1 |
HIP 90346 |
14.15 |
| 2026-02-21 00:00 |
18:28:30.12 |
-66:44:30.0 |
HIP 90346 |
15.47 |
| 2026-02-21 12:00 |
18:28:40.58 |
-66:45:35.3 |
HIP 90704 |
14.64 |
| 2026-02-22 00:00 |
18:28:50.92 |
-66:46:40.9 |
HIP 90704 |
13.15 |
| 2026-02-22 12:00 |
18:29:01.13 |
-66:47:46.9 |
HIP 90704 |
11.66 |
| 2026-02-23 00:00 |
18:29:11.22 |
-66:48:53.3 |
HIP 90704 |
10.17 |
| 2026-02-23 12:00 |
18:29:21.18 |
-66:50:00.0 |
HIP 90704 |
8.69 |
| 2026-02-24 00:00 |
18:29:31.02 |
-66:51:07.1 |
HIP 90704 |
7.22 |