| 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) |
| 2026-05-12 00:00 |
13:19:20.19 |
+03:10:37.4 |
HIP 65067 |
15.13 |
| 2026-05-12 12:00 |
13:19:06.77 |
+03:11:41.3 |
HIP 64984 |
17.48 |
| 2026-05-13 00:00 |
13:18:53.46 |
+03:12:44.1 |
HIP 64984 |
18.82 |
| 2026-05-13 12:00 |
13:18:40.26 |
+03:13:45.7 |
HIP 64984 |
20.65 |
| 2026-05-14 00:00 |
13:18:27.16 |
+03:14:46.1 |
HIP 64984 |
22.82 |
| 2026-05-14 12:00 |
13:18:14.18 |
+03:15:45.3 |
HIP 64984 |
25.24 |
| 2026-05-15 00:00 |
13:18:01.32 |
+03:16:43.4 |
HIP 64954 |
27.51 |
| 2026-05-15 12:00 |
13:17:48.57 |
+03:17:40.3 |
HIP 64954 |
28.29 |
| 2026-05-16 00:00 |
13:17:35.94 |
+03:18:36.0 |
HIP 64917 |
28.96 |
| 2026-05-16 12:00 |
13:17:23.42 |
+03:19:30.5 |
HIP 64917 |
29.55 |
| 2026-05-17 00:00 |
13:17:11.03 |
+03:20:23.8 |
HIP 64697 |
26.62 |
| 2026-05-17 12:00 |
13:16:58.76 |
+03:21:16.0 |
HIP 64697 |
23.52 |
| 2026-05-18 00:00 |
13:16:46.62 |
+03:22:06.9 |
HIP 64697 |
20.48 |
| 2026-05-18 12:00 |
13:16:34.60 |
+03:22:56.6 |
HIP 64697 |
17.51 |
| 2026-05-19 00:00 |
13:16:22.70 |
+03:23:45.1 |
HIP 64697 |
14.64 |
| 2026-05-19 12:00 |
13:16:10.94 |
+03:24:32.4 |
HIP 64697 |
11.91 |
| 2026-05-20 00:00 |
13:15:59.30 |
+03:25:18.5 |
HIP 64697 |
9.41 |
| 2026-05-20 12:00 |
13:15:47.80 |
+03:26:03.3 |
HIP 64697 |
7.32 |
| 2026-05-21 00:00 |
13:15:36.42 |
+03:26:46.9 |
HIP 64697 |
6.05 |
| 2026-05-21 12:00 |
13:15:25.18 |
+03:27:29.4 |
HIP 64697 |
6.07 |
| 2026-05-22 00:00 |
13:15:14.08 |
+03:28:10.6 |
HIP 64697 |
7.32 |
| 2026-05-22 12:00 |
13:15:03.11 |
+03:28:50.5 |
HIP 64697 |
9.29 |
| 2026-05-23 00:00 |
13:14:52.27 |
+03:29:29.3 |
HIP 64697 |
11.58 |
| 2026-05-23 12:00 |
13:14:41.58 |
+03:30:06.8 |
HIP 64697 |
14.02 |
| 2026-05-24 00:00 |
13:14:31.02 |
+03:30:43.1 |
HIP 64697 |
16.52 |
| 2026-05-24 12:00 |
13:14:20.61 |
+03:31:18.2 |
HIP 64697 |
19.05 |
| 2026-05-25 00:00 |
13:14:10.33 |
+03:31:52.0 |
HIP 64697 |
21.57 |
| 2026-05-25 12:00 |
13:14:00.20 |
+03:32:24.7 |
HIP 64697 |
24.08 |
| 2026-05-26 00:00 |
13:13:50.20 |
+03:32:56.1 |
HIP 64697 |
26.57 |
| 2026-05-26 12:00 |
13:13:40.36 |
+03:33:26.3 |
HIP 64697 |
29.04 |
| 2026-05-27 00:00 |
13:13:30.65 |
+03:33:55.2 |
HIP 64697 |
31.47 |
| 2026-05-27 12:00 |
13:13:21.09 |
+03:34:23.0 |
HIP 64453 |
31.43 |
| 2026-05-28 00:00 |
13:13:11.68 |
+03:34:49.5 |
HIP 64453 |
30.32 |
| 2026-05-28 12:00 |
13:13:02.42 |
+03:35:14.8 |
HIP 64453 |
29.39 |
| 2026-05-29 00:00 |
13:12:53.30 |
+03:35:38.9 |
HIP 64453 |
28.64 |
| 2026-05-29 12:00 |
13:12:44.33 |
+03:36:01.8 |
HIP 64453 |
28.09 |
| 2026-05-30 00:00 |
13:12:35.51 |
+03:36:23.4 |
HIP 64453 |
27.73 |
| 2026-05-30 12:00 |
13:12:26.83 |
+03:36:43.9 |
HIP 64453 |
27.56 |
| 2026-05-31 00:00 |
13:12:18.31 |
+03:37:03.1 |
HIP 64453 |
27.58 |
| 2026-05-31 12:00 |
13:12:09.94 |
+03:37:21.1 |
HIP 64453 |
27.78 |
| 2026-06-01 00:00 |
13:12:01.72 |
+03:37:37.9 |
HIP 64453 |
28.14 |
| 2026-06-01 12:00 |
13:11:53.66 |
+03:37:53.5 |
HIP 64453 |
28.65 |
| 2026-06-02 00:00 |
13:11:45.75 |
+03:38:07.9 |
HIP 64350 |
28.51 |