| 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) |
| 2026-03-26 00:00 |
19:26:03.41 |
-35:21:32.4 |
HIP 95366 |
27.66 |
| 2026-03-26 12:00 |
19:26:20.67 |
-35:22:09.7 |
HIP 95731 |
28.25 |
| 2026-03-27 00:00 |
19:26:37.75 |
-35:22:47.4 |
HIP 95731 |
25.65 |
| 2026-03-27 12:00 |
19:26:54.66 |
-35:23:25.7 |
HIP 95731 |
23.33 |
| 2026-03-28 00:00 |
19:27:11.39 |
-35:24:04.6 |
HIP 95731 |
21.37 |
| 2026-03-28 12:00 |
19:27:27.93 |
-35:24:44.0 |
HIP 95731 |
19.86 |
| 2026-03-29 00:00 |
19:27:44.30 |
-35:25:23.9 |
HIP 95731 |
18.89 |
| 2026-03-29 12:00 |
19:28:00.48 |
-35:26:04.3 |
HIP 95731 |
18.52 |
| 2026-03-30 00:00 |
19:28:16.48 |
-35:26:45.3 |
HIP 95731 |
18.77 |
| 2026-03-30 12:00 |
19:28:32.29 |
-35:27:26.9 |
HIP 95753 |
19.47 |
| 2026-03-31 00:00 |
19:28:47.92 |
-35:28:09.0 |
HIP 95753 |
20.43 |
| 2026-03-31 12:00 |
19:29:03.36 |
-35:28:51.6 |
HIP 95753 |
21.84 |
| 2026-04-01 00:00 |
19:29:18.62 |
-35:29:34.8 |
HIP 95753 |
23.60 |
| 2026-04-01 12:00 |
19:29:33.69 |
-35:30:18.6 |
HIP 95783 |
24.32 |
| 2026-04-02 00:00 |
19:29:48.56 |
-35:31:02.9 |
HIP 95783 |
24.81 |
| 2026-04-02 12:00 |
19:30:03.25 |
-35:31:47.7 |
HIP 95783 |
25.64 |
| 2026-04-03 00:00 |
19:30:17.75 |
-35:32:33.2 |
HIP 95783 |
26.77 |
| 2026-04-03 12:00 |
19:30:32.05 |
-35:33:19.2 |
HIP 96113 |
24.88 |
| 2026-04-04 00:00 |
19:30:46.17 |
-35:34:05.7 |
HIP 96113 |
22.34 |
| 2026-04-04 12:00 |
19:31:00.08 |
-35:34:52.9 |
HIP 96113 |
19.96 |
| 2026-04-05 00:00 |
19:31:13.80 |
-35:35:40.6 |
HIP 96113 |
17.79 |
| 2026-04-05 12:00 |
19:31:27.33 |
-35:36:28.8 |
HIP 96113 |
15.89 |
| 2026-04-06 00:00 |
19:31:40.66 |
-35:37:17.7 |
HIP 96113 |
14.36 |
| 2026-04-06 12:00 |
19:31:53.78 |
-35:38:07.1 |
HIP 96113 |
13.29 |
| 2026-04-07 00:00 |
19:32:06.71 |
-35:38:57.1 |
HIP 96113 |
12.77 |
| 2026-04-07 12:00 |
19:32:19.44 |
-35:39:47.7 |
HIP 96113 |
12.86 |
| 2026-04-08 00:00 |
19:32:31.97 |
-35:40:38.8 |
HIP 96113 |
13.52 |
| 2026-04-08 12:00 |
19:32:44.29 |
-35:41:30.5 |
HIP 96113 |
14.65 |
| 2026-04-09 00:00 |
19:32:56.41 |
-35:42:22.9 |
HIP 96113 |
16.14 |
| 2026-04-09 12:00 |
19:33:08.32 |
-35:43:15.8 |
HIP 96113 |
17.88 |
| 2026-04-10 00:00 |
19:33:20.02 |
-35:44:09.2 |
HIP 96113 |
19.78 |
| 2026-04-10 12:00 |
19:33:31.52 |
-35:45:03.3 |
HIP 96113 |
21.80 |
| 2026-04-11 00:00 |
19:33:42.81 |
-35:45:58.0 |
HIP 96113 |
23.90 |
| 2026-04-11 12:00 |
19:33:53.89 |
-35:46:53.2 |
HIP 96113 |
26.04 |
| 2026-04-12 00:00 |
19:34:04.76 |
-35:47:49.0 |
HIP 96259 |
27.33 |
| 2026-04-12 12:00 |
19:34:15.41 |
-35:48:45.5 |
HIP 96259 |
26.23 |
| 2026-04-13 00:00 |
19:34:25.86 |
-35:49:42.5 |
HIP 96259 |
25.29 |
| 2026-04-13 12:00 |
19:34:36.08 |
-35:50:40.0 |
HIP 96407 |
24.13 |
| 2026-04-14 00:00 |
19:34:46.10 |
-35:51:38.2 |
HIP 96407 |
22.01 |
| 2026-04-14 12:00 |
19:34:55.89 |
-35:52:37.0 |
HIP 96407 |
19.94 |
| 2026-04-15 00:00 |
19:35:05.47 |
-35:53:36.3 |
HIP 96407 |
17.93 |
| 2026-04-15 12:00 |
19:35:14.83 |
-35:54:36.3 |
HIP 96407 |
15.97 |
| 2026-04-16 00:00 |
19:35:23.97 |
-35:55:36.8 |
HIP 96407 |
14.09 |