| 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) |
| 2026-09-20 00:00 |
18:39:04.72 |
-36:56:37.6 |
HIP 91266 |
30.01 |
| 2026-09-20 12:00 |
18:39:09.82 |
-36:55:03.4 |
HIP 91266 |
31.72 |
| 2026-09-21 00:00 |
18:39:15.15 |
-36:53:29.2 |
HIP 91266 |
33.49 |
| 2026-09-21 12:00 |
18:39:20.71 |
-36:51:54.9 |
HIP 91266 |
35.31 |
| 2026-09-22 00:00 |
18:39:26.51 |
-36:50:20.6 |
HIP 91470 |
36.60 |
| 2026-09-22 12:00 |
18:39:32.54 |
-36:48:46.2 |
HIP 91470 |
35.09 |
| 2026-09-23 00:00 |
18:39:38.80 |
-36:47:11.7 |
HIP 91470 |
33.65 |
| 2026-09-23 12:00 |
18:39:45.28 |
-36:45:37.2 |
HIP 91470 |
32.27 |
| 2026-09-24 00:00 |
18:39:52.00 |
-36:44:02.7 |
HIP 91639 |
30.72 |
| 2026-09-24 12:00 |
18:39:58.94 |
-36:42:28.1 |
HIP 91639 |
28.64 |
| 2026-09-25 00:00 |
18:40:06.11 |
-36:40:53.5 |
HIP 91639 |
26.53 |
| 2026-09-25 12:00 |
18:40:13.50 |
-36:39:18.9 |
HIP 91639 |
24.41 |
| 2026-09-26 00:00 |
18:40:21.12 |
-36:37:44.2 |
HIP 91639 |
22.27 |
| 2026-09-26 12:00 |
18:40:28.96 |
-36:36:09.5 |
HIP 91639 |
20.12 |
| 2026-09-27 00:00 |
18:40:37.03 |
-36:34:34.8 |
HIP 91639 |
17.97 |
| 2026-09-27 12:00 |
18:40:45.31 |
-36:33:00.0 |
HIP 91639 |
15.83 |
| 2026-09-28 00:00 |
18:40:53.81 |
-36:31:25.3 |
HIP 91639 |
13.73 |
| 2026-09-28 12:00 |
18:41:02.54 |
-36:29:50.5 |
HIP 91639 |
11.70 |
| 2026-09-29 00:00 |
18:41:11.48 |
-36:28:15.8 |
HIP 91639 |
9.82 |
| 2026-09-29 12:00 |
18:41:20.63 |
-36:26:41.0 |
HIP 91639 |
8.20 |
| 2026-09-30 00:00 |
18:41:30.01 |
-36:25:06.2 |
HIP 91639 |
7.09 |
| 2026-09-30 12:00 |
18:41:39.59 |
-36:23:31.4 |
HIP 91639 |
6.77 |
| 2026-10-01 00:00 |
18:41:49.40 |
-36:21:56.6 |
HIP 91719 |
6.54 |
| 2026-10-01 12:00 |
18:41:59.41 |
-36:20:21.8 |
HIP 91719 |
6.71 |
| 2026-10-02 00:00 |
18:42:09.64 |
-36:18:47.0 |
HIP 91719 |
7.76 |
| 2026-10-02 12:00 |
18:42:20.08 |
-36:17:12.2 |
HIP 91719 |
9.44 |
| 2026-10-03 00:00 |
18:42:30.72 |
-36:15:37.4 |
HIP 91719 |
11.49 |
| 2026-10-03 12:00 |
18:42:41.58 |
-36:14:02.7 |
HIP 91719 |
13.78 |
| 2026-10-04 00:00 |
18:42:52.65 |
-36:12:27.9 |
HIP 91719 |
16.21 |
| 2026-10-04 12:00 |
18:43:03.92 |
-36:10:53.2 |
HIP 91719 |
18.75 |
| 2026-10-05 00:00 |
18:43:15.40 |
-36:09:18.4 |
HIP 91719 |
21.37 |
| 2026-10-05 12:00 |
18:43:27.09 |
-36:07:43.7 |
HIP 91719 |
24.05 |
| 2026-10-06 00:00 |
18:43:38.98 |
-36:06:09.0 |
HIP 92017 |
25.00 |
| 2026-10-06 12:00 |
18:43:51.07 |
-36:04:34.3 |
HIP 92017 |
22.09 |
| 2026-10-07 00:00 |
18:44:03.37 |
-36:02:59.6 |
HIP 92017 |
19.16 |
| 2026-10-07 12:00 |
18:44:15.86 |
-36:01:25.0 |
HIP 92017 |
16.19 |
| 2026-10-08 00:00 |
18:44:28.56 |
-35:59:50.3 |
HIP 92017 |
13.21 |
| 2026-10-08 12:00 |
18:44:41.46 |
-35:58:15.7 |
HIP 92017 |
10.20 |
| 2026-10-09 00:00 |
18:44:54.56 |
-35:56:41.1 |
HIP 92017 |
7.21 |
| 2026-10-09 12:00 |
18:45:07.85 |
-35:55:06.6 |
HIP 92017 |
4.32 |
| 2026-10-10 00:00 |
18:45:21.34 |
-35:53:32.0 |
HIP 92017 |
2.20 |
| 2026-10-10 12:00 |
18:45:35.02 |
-35:51:57.5 |
HIP 92017 |
3.35 |
| 2026-10-11 00:00 |
18:45:48.90 |
-35:50:23.0 |
HIP 92017 |
6.20 |