| Parameter |
Value |
| Designation |
58P/Jackson-Neujmin |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2004-01-10T23:19:25.939200Z |
| Orbit solution date (soln_date, UTC) |
2025-08-20T10:51:01Z |
| Obs used |
378 |
| NEO |
- |
| M1 |
14.300 |
| K1 |
12.750 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2003-12-23.0000000 |
| e |
0.66050328 |
| q (au) |
1.388697 |
| a (au) |
4.090458 |
| i (deg) |
13.457364 |
| Ω (om, deg) |
160.614645 |
| ω (w, deg) |
200.436069 |
| M (ma, deg) |
357.739756 |
Magnitude
Scatter + Global Linear
$$
M_a = (11.498 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
11.498 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-1.000 |
| 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
Residuals (Piecewise)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| Start (UTC) |
End (UTC) |
a |
b |
| 2020-04-08 |
2020-11-23 |
+24.7519 |
-5.644 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
13:14:05.22 |
+02:10:22.4 |
HIP 64433 |
38.55 |
| 2026-07-29 12:00 |
13:14:15.02 |
+02:08:48.1 |
HIP 64802 |
39.57 |
| 2026-07-30 00:00 |
13:14:24.96 |
+02:07:13.3 |
HIP 64802 |
37.23 |
| 2026-07-30 12:00 |
13:14:35.02 |
+02:05:37.9 |
HIP 64802 |
34.95 |
| 2026-07-31 00:00 |
13:14:45.21 |
+02:04:01.9 |
HIP 64802 |
32.75 |
| 2026-07-31 12:00 |
13:14:55.53 |
+02:02:25.3 |
HIP 64802 |
30.67 |
| 2026-08-01 00:00 |
13:15:05.97 |
+02:00:48.1 |
HIP 64802 |
28.72 |
| 2026-08-01 12:00 |
13:15:16.55 |
+01:59:10.4 |
HIP 64802 |
26.97 |
| 2026-08-02 00:00 |
13:15:27.24 |
+01:57:32.1 |
HIP 64802 |
25.45 |
| 2026-08-02 12:00 |
13:15:38.07 |
+01:55:53.3 |
HIP 64802 |
24.23 |
| 2026-08-03 00:00 |
13:15:49.02 |
+01:54:13.9 |
HIP 64802 |
23.35 |
| 2026-08-03 12:00 |
13:16:00.09 |
+01:52:34.0 |
HIP 64802 |
22.89 |
| 2026-08-04 00:00 |
13:16:11.28 |
+01:50:53.5 |
HIP 64802 |
22.87 |
| 2026-08-04 12:00 |
13:16:22.60 |
+01:49:12.5 |
HIP 64802 |
23.30 |
| 2026-08-05 00:00 |
13:16:34.05 |
+01:47:31.0 |
HIP 64802 |
24.19 |
| 2026-08-05 12:00 |
13:16:45.61 |
+01:45:48.9 |
HIP 64802 |
25.49 |
| 2026-08-06 00:00 |
13:16:57.30 |
+01:44:06.3 |
HIP 64802 |
27.15 |
| 2026-08-06 12:00 |
13:17:09.10 |
+01:42:23.2 |
HIP 64799 |
28.30 |
| 2026-08-07 00:00 |
13:17:21.03 |
+01:40:39.6 |
HIP 64799 |
27.24 |
| 2026-08-07 12:00 |
13:17:33.08 |
+01:38:55.5 |
HIP 64799 |
26.59 |
| 2026-08-08 00:00 |
13:17:45.25 |
+01:37:10.9 |
HIP 64930 |
24.89 |
| 2026-08-08 12:00 |
13:17:57.53 |
+01:35:25.8 |
HIP 64930 |
22.06 |
| 2026-08-09 00:00 |
13:18:09.94 |
+01:33:40.2 |
HIP 64930 |
19.45 |
| 2026-08-09 12:00 |
13:18:22.46 |
+01:31:54.2 |
HIP 64930 |
17.18 |
| 2026-08-10 00:00 |
13:18:35.10 |
+01:30:07.6 |
HIP 64930 |
15.41 |
| 2026-08-10 12:00 |
13:18:47.86 |
+01:28:20.6 |
HIP 64930 |
14.36 |
| 2026-08-11 00:00 |
13:19:00.73 |
+01:26:33.2 |
HIP 64930 |
14.21 |
| 2026-08-11 12:00 |
13:19:13.72 |
+01:24:45.3 |
HIP 64930 |
15.01 |
| 2026-08-12 00:00 |
13:19:26.82 |
+01:22:56.9 |
HIP 65051 |
16.26 |
| 2026-08-12 12:00 |
13:19:40.04 |
+01:21:08.1 |
HIP 65051 |
16.42 |
| 2026-08-13 00:00 |
13:19:53.37 |
+01:19:18.8 |
HIP 65051 |
17.42 |
| 2026-08-13 12:00 |
13:20:06.81 |
+01:17:29.2 |
HIP 65051 |
19.14 |
| 2026-08-14 00:00 |
13:20:20.36 |
+01:15:39.1 |
HIP 65051 |
21.43 |
| 2026-08-14 12:00 |
13:20:34.03 |
+01:13:48.5 |
HIP 65211 |
21.53 |
| 2026-08-15 00:00 |
13:20:47.81 |
+01:11:57.6 |
HIP 65211 |
19.59 |
| 2026-08-15 12:00 |
13:21:01.69 |
+01:10:06.3 |
HIP 65211 |
18.28 |
| 2026-08-16 00:00 |
13:21:15.69 |
+01:08:14.6 |
HIP 65211 |
17.76 |
| 2026-08-16 12:00 |
13:21:29.79 |
+01:06:22.4 |
HIP 65211 |
18.10 |
| 2026-08-17 00:00 |
13:21:44.00 |
+01:04:30.0 |
HIP 65211 |
19.29 |
| 2026-08-17 12:00 |
13:21:58.32 |
+01:02:37.1 |
HIP 65211 |
21.20 |
| 2026-08-18 00:00 |
13:22:12.75 |
+01:00:43.8 |
HIP 65211 |
23.66 |
| 2026-08-18 12:00 |
13:22:27.28 |
+00:58:50.2 |
HIP 65211 |
26.53 |
| 2026-08-19 00:00 |
13:22:41.92 |
+00:56:56.2 |
HIP 65211 |
29.71 |