| 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) |
| 2026-05-12 00:00 |
19:37:57.38 |
-37:00:01.6 |
HIP 96398 |
26.74 |
| 2026-05-12 12:00 |
19:37:53.86 |
-37:01:27.0 |
HIP 96398 |
26.77 |
| 2026-05-13 00:00 |
19:37:50.07 |
-37:02:52.8 |
HIP 96374 |
26.51 |
| 2026-05-13 12:00 |
19:37:46.04 |
-37:04:18.8 |
HIP 96374 |
25.89 |
| 2026-05-14 00:00 |
19:37:41.75 |
-37:05:45.1 |
HIP 96374 |
25.32 |
| 2026-05-14 12:00 |
19:37:37.21 |
-37:07:11.6 |
HIP 96374 |
24.81 |
| 2026-05-15 00:00 |
19:37:32.42 |
-37:08:38.4 |
HIP 96374 |
24.35 |
| 2026-05-15 12:00 |
19:37:27.37 |
-37:10:05.3 |
HIP 96374 |
23.97 |
| 2026-05-16 00:00 |
19:37:22.07 |
-37:11:32.5 |
HIP 96374 |
23.67 |
| 2026-05-16 12:00 |
19:37:16.51 |
-37:12:59.9 |
HIP 96374 |
23.47 |
| 2026-05-17 00:00 |
19:37:10.71 |
-37:14:27.4 |
HIP 96374 |
23.37 |
| 2026-05-17 12:00 |
19:37:04.65 |
-37:15:55.1 |
HIP 96374 |
23.38 |
| 2026-05-18 00:00 |
19:36:58.34 |
-37:17:23.0 |
HIP 96374 |
23.52 |
| 2026-05-18 12:00 |
19:36:51.77 |
-37:18:51.0 |
HIP 96374 |
23.78 |
| 2026-05-19 00:00 |
19:36:44.96 |
-37:20:19.1 |
HIP 96374 |
24.17 |
| 2026-05-19 12:00 |
19:36:37.90 |
-37:21:47.4 |
HIP 96374 |
24.70 |
| 2026-05-20 00:00 |
19:36:30.58 |
-37:23:15.7 |
HIP 96374 |
25.37 |
| 2026-05-20 12:00 |
19:36:23.02 |
-37:24:44.1 |
HIP 96250 |
26.00 |
| 2026-05-21 00:00 |
19:36:15.21 |
-37:26:12.6 |
HIP 96250 |
24.10 |
| 2026-05-21 12:00 |
19:36:07.15 |
-37:27:41.2 |
HIP 96250 |
22.21 |
| 2026-05-22 00:00 |
19:35:58.84 |
-37:29:09.7 |
HIP 96250 |
20.32 |
| 2026-05-22 12:00 |
19:35:50.29 |
-37:30:38.3 |
HIP 96250 |
18.46 |
| 2026-05-23 00:00 |
19:35:41.49 |
-37:32:06.9 |
HIP 96250 |
16.64 |
| 2026-05-23 12:00 |
19:35:32.44 |
-37:33:35.5 |
HIP 96250 |
14.91 |
| 2026-05-24 00:00 |
19:35:23.16 |
-37:35:04.1 |
HIP 96250 |
13.32 |
| 2026-05-24 12:00 |
19:35:13.62 |
-37:36:32.6 |
HIP 96250 |
11.93 |
| 2026-05-25 00:00 |
19:35:03.85 |
-37:38:01.1 |
HIP 96250 |
10.86 |
| 2026-05-25 12:00 |
19:34:53.84 |
-37:39:29.5 |
HIP 96250 |
10.23 |
| 2026-05-26 00:00 |
19:34:43.58 |
-37:40:57.9 |
HIP 96250 |
10.16 |
| 2026-05-26 12:00 |
19:34:33.09 |
-37:42:26.1 |
HIP 96250 |
10.67 |
| 2026-05-27 00:00 |
19:34:22.35 |
-37:43:54.2 |
HIP 96250 |
11.73 |
| 2026-05-27 12:00 |
19:34:11.38 |
-37:45:22.2 |
HIP 96181 |
12.11 |
| 2026-05-28 00:00 |
19:34:00.17 |
-37:46:50.1 |
HIP 96181 |
11.58 |
| 2026-05-28 12:00 |
19:33:48.73 |
-37:48:17.8 |
HIP 96181 |
11.64 |
| 2026-05-29 00:00 |
19:33:37.05 |
-37:49:45.3 |
HIP 96181 |
12.29 |
| 2026-05-29 12:00 |
19:33:25.14 |
-37:51:12.6 |
HIP 96181 |
13.46 |
| 2026-05-30 00:00 |
19:33:13.00 |
-37:52:39.7 |
HIP 96181 |
15.07 |
| 2026-05-30 12:00 |
19:33:00.62 |
-37:54:06.6 |
HIP 96119 |
15.77 |
| 2026-05-31 00:00 |
19:32:48.02 |
-37:55:33.3 |
HIP 96119 |
13.80 |
| 2026-05-31 12:00 |
19:32:35.18 |
-37:56:59.6 |
HIP 96119 |
12.20 |
| 2026-06-01 00:00 |
19:32:22.12 |
-37:58:25.8 |
HIP 96119 |
11.16 |
| 2026-06-01 12:00 |
19:32:08.84 |
-37:59:51.6 |
HIP 96119 |
10.87 |
| 2026-06-02 00:00 |
19:31:55.32 |
-38:01:17.1 |
HIP 96119 |
11.42 |