458P/Jahn
| Parameter |
Value |
| Designation |
458P/Jahn |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2022-10-30T01:02:09.162240Z |
| Orbit solution date (soln_date, UTC) |
2023-04-26T18:45:19Z |
| Obs used |
65 |
| NEO |
- |
| M1 |
9.200 |
| K1 |
22.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2016-02-10T13:20:07.814400Z |
| Discovery magnitude (MPC) |
23.98 G |
| Discovery observatory (MPC) |
F51 · Pan-STARRS 1, Haleakala |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2020-03-22.0000000 |
| e |
0.31500840 |
| q (au) |
2.645016 |
| a (au) |
3.861384 |
| i (deg) |
13.606395 |
| Ω (om, deg) |
1.625135 |
| ω (w, deg) |
104.364729 |
| M (ma, deg) |
236.335161 |
Magnitude
Scatter + Global Linear
$$
M_a = (14.803 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
14.803 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.696 |
| 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) |
| 2026-02-03 00:00 |
18:44:12.27 |
-34:52:58.8 |
HIP 91746 |
26.43 |
| 2026-02-03 12:00 |
18:44:42.41 |
-34:53:02.8 |
HIP 92070 |
23.92 |
| 2026-02-04 00:00 |
18:45:12.47 |
-34:53:07.0 |
HIP 92070 |
20.65 |
| 2026-02-04 12:00 |
18:45:42.46 |
-34:53:11.3 |
HIP 92070 |
18.91 |
| 2026-02-05 00:00 |
18:46:12.37 |
-34:53:15.7 |
HIP 92070 |
19.09 |
| 2026-02-05 12:00 |
18:46:42.19 |
-34:53:20.2 |
HIP 92070 |
21.14 |
| 2026-02-06 00:00 |
18:47:11.94 |
-34:53:24.9 |
HIP 92070 |
24.57 |
| 2026-02-06 12:00 |
18:47:41.60 |
-34:53:29.6 |
HIP 92350 |
21.40 |
| 2026-02-07 00:00 |
18:48:11.18 |
-34:53:34.6 |
HIP 92350 |
16.06 |
| 2026-02-07 12:00 |
18:48:40.68 |
-34:53:39.6 |
HIP 92350 |
11.50 |
| 2026-02-08 00:00 |
18:49:10.09 |
-34:53:44.8 |
HIP 92350 |
8.93 |
| 2026-02-08 12:00 |
18:49:39.42 |
-34:53:50.2 |
HIP 92350 |
10.01 |
| 2026-02-09 00:00 |
18:50:08.66 |
-34:53:55.7 |
HIP 92350 |
13.88 |
| 2026-02-09 12:00 |
18:50:37.81 |
-34:54:01.3 |
HIP 92540 |
11.06 |
| 2026-02-10 00:00 |
18:51:06.88 |
-34:54:07.2 |
HIP 92540 |
5.57 |
| 2026-02-10 12:00 |
18:51:35.85 |
-34:54:13.1 |
HIP 92540 |
3.29 |
| 2026-02-11 00:00 |
18:52:04.74 |
-34:54:19.3 |
HIP 92540 |
7.80 |
| 2026-02-11 12:00 |
18:52:33.53 |
-34:54:25.6 |
HIP 92540 |
13.43 |
| 2026-02-12 00:00 |
18:53:02.23 |
-34:54:32.1 |
HIP 92611 |
17.59 |
| 2026-02-12 12:00 |
18:53:30.84 |
-34:54:38.8 |
HIP 92611 |
21.36 |
| 2026-02-13 00:00 |
18:53:59.35 |
-34:54:45.7 |
HIP 92841 |
17.70 |
| 2026-02-13 12:00 |
18:54:27.77 |
-34:54:52.7 |
HIP 92841 |
14.09 |
| 2026-02-14 00:00 |
18:54:56.09 |
-34:55:00.0 |
HIP 92841 |
12.30 |
| 2026-02-14 12:00 |
18:55:24.31 |
-34:55:07.5 |
HIP 92841 |
13.08 |
| 2026-02-15 00:00 |
18:55:52.43 |
-34:55:15.1 |
HIP 92841 |
16.04 |
| 2026-02-15 12:00 |
18:56:20.46 |
-34:55:23.0 |
HIP 92892 |
19.04 |
| 2026-02-16 00:00 |
18:56:48.38 |
-34:55:31.1 |
HIP 93147 |
21.05 |
| 2026-02-16 12:00 |
18:57:16.21 |
-34:55:39.4 |
HIP 93147 |
15.65 |
| 2026-02-17 00:00 |
18:57:43.92 |
-34:55:47.9 |
HIP 93147 |
10.60 |
| 2026-02-17 12:00 |
18:58:11.54 |
-34:55:56.6 |
HIP 93147 |
6.69 |
| 2026-02-18 00:00 |
18:58:39.05 |
-34:56:05.6 |
HIP 93147 |
6.43 |
| 2026-02-18 12:00 |
18:59:06.46 |
-34:56:14.8 |
HIP 93147 |
10.06 |
| 2026-02-19 00:00 |
18:59:33.75 |
-34:56:24.3 |
HIP 93147 |
14.96 |
| 2026-02-19 12:00 |
19:00:00.94 |
-34:56:33.9 |
HIP 93147 |
20.20 |
| 2026-02-20 00:00 |
19:00:28.03 |
-34:56:43.9 |
HIP 93147 |
25.57 |
| 2026-02-20 12:00 |
19:00:55.00 |
-34:56:54.1 |
HIP 93493 |
22.09 |
| 2026-02-21 00:00 |
19:01:21.86 |
-34:57:04.5 |
HIP 93493 |
17.62 |
| 2026-02-21 12:00 |
19:01:48.61 |
-34:57:15.2 |
HIP 93493 |
13.90 |
| 2026-02-22 00:00 |
19:02:15.24 |
-34:57:26.2 |
HIP 93493 |
11.67 |
| 2026-02-22 12:00 |
19:02:41.76 |
-34:57:37.4 |
HIP 93493 |
11.76 |
| 2026-02-23 00:00 |
19:03:08.17 |
-34:57:48.9 |
HIP 93593 |
7.28 |
| 2026-02-23 12:00 |
19:03:34.46 |
-34:58:00.7 |
HIP 93593 |
4.05 |
| 2026-02-24 00:00 |
19:04:00.64 |
-34:58:12.8 |
HIP 93593 |
6.15 |