58P/Jackson-Neujmin
| 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) |
| 2026-02-03 00:00 |
13:55:20.67 |
-02:16:48.3 |
HIP 67946 |
9.38 |
| 2026-02-03 12:00 |
13:55:21.81 |
-02:15:52.1 |
HIP 67946 |
10.21 |
| 2026-02-04 00:00 |
13:55:22.78 |
-02:14:54.9 |
HIP 67946 |
11.05 |
| 2026-02-04 12:00 |
13:55:23.59 |
-02:13:56.8 |
HIP 67946 |
11.90 |
| 2026-02-05 00:00 |
13:55:24.24 |
-02:12:57.6 |
HIP 67946 |
12.75 |
| 2026-02-05 12:00 |
13:55:24.73 |
-02:11:57.5 |
HIP 67946 |
13.61 |
| 2026-02-06 00:00 |
13:55:25.05 |
-02:10:56.4 |
HIP 67946 |
14.49 |
| 2026-02-06 12:00 |
13:55:25.21 |
-02:09:54.3 |
HIP 67946 |
15.37 |
| 2026-02-07 00:00 |
13:55:25.20 |
-02:08:51.3 |
HIP 67946 |
16.26 |
| 2026-02-07 12:00 |
13:55:25.03 |
-02:07:47.2 |
HIP 67946 |
17.16 |
| 2026-02-08 00:00 |
13:55:24.70 |
-02:06:42.2 |
HIP 67946 |
18.08 |
| 2026-02-08 12:00 |
13:55:24.20 |
-02:05:36.3 |
HIP 67946 |
19.02 |
| 2026-02-09 00:00 |
13:55:23.53 |
-02:04:29.3 |
HIP 67946 |
19.96 |
| 2026-02-09 12:00 |
13:55:22.70 |
-02:03:21.4 |
HIP 67875 |
19.59 |
| 2026-02-10 00:00 |
13:55:21.70 |
-02:02:12.6 |
HIP 67875 |
19.06 |
| 2026-02-10 12:00 |
13:55:20.54 |
-02:01:02.7 |
HIP 67875 |
18.55 |
| 2026-02-11 00:00 |
13:55:19.21 |
-01:59:51.9 |
HIP 67875 |
18.06 |
| 2026-02-11 12:00 |
13:55:17.71 |
-01:58:40.2 |
HIP 67875 |
17.59 |
| 2026-02-12 00:00 |
13:55:16.04 |
-01:57:27.5 |
HIP 67875 |
17.17 |
| 2026-02-12 12:00 |
13:55:14.20 |
-01:56:13.9 |
HIP 67875 |
16.79 |
| 2026-02-13 00:00 |
13:55:12.20 |
-01:54:59.3 |
HIP 67875 |
16.47 |
| 2026-02-13 12:00 |
13:55:10.03 |
-01:53:43.8 |
HIP 67875 |
16.21 |
| 2026-02-14 00:00 |
13:55:07.69 |
-01:52:27.4 |
HIP 67875 |
16.04 |
| 2026-02-14 12:00 |
13:55:05.18 |
-01:51:10.0 |
HIP 67875 |
15.95 |
| 2026-02-15 00:00 |
13:55:02.51 |
-01:49:51.7 |
HIP 67875 |
15.97 |
| 2026-02-15 12:00 |
13:54:59.66 |
-01:48:32.5 |
HIP 67875 |
16.09 |
| 2026-02-16 00:00 |
13:54:56.65 |
-01:47:12.4 |
HIP 67875 |
16.33 |
| 2026-02-16 12:00 |
13:54:53.47 |
-01:45:51.4 |
HIP 67929 |
15.92 |
| 2026-02-17 00:00 |
13:54:50.12 |
-01:44:29.4 |
HIP 67929 |
14.44 |
| 2026-02-17 12:00 |
13:54:46.60 |
-01:43:06.6 |
HIP 67929 |
12.97 |
| 2026-02-18 00:00 |
13:54:42.91 |
-01:41:42.9 |
HIP 67929 |
11.53 |
| 2026-02-18 12:00 |
13:54:39.06 |
-01:40:18.3 |
HIP 67929 |
10.15 |
| 2026-02-19 00:00 |
13:54:35.03 |
-01:38:52.8 |
HIP 67929 |
8.88 |
| 2026-02-19 12:00 |
13:54:30.84 |
-01:37:26.4 |
HIP 67929 |
7.79 |
| 2026-02-20 00:00 |
13:54:26.48 |
-01:35:59.2 |
HIP 67929 |
7.01 |
| 2026-02-20 12:00 |
13:54:21.95 |
-01:34:31.1 |
HIP 67929 |
6.66 |
| 2026-02-21 00:00 |
13:54:17.26 |
-01:33:02.2 |
HIP 67929 |
6.85 |
| 2026-02-21 12:00 |
13:54:12.40 |
-01:31:32.5 |
HIP 67929 |
7.57 |
| 2026-02-22 00:00 |
13:54:07.37 |
-01:30:01.9 |
HIP 67929 |
8.70 |
| 2026-02-22 12:00 |
13:54:02.18 |
-01:28:30.4 |
HIP 67929 |
10.14 |
| 2026-02-23 00:00 |
13:53:56.82 |
-01:26:58.2 |
HIP 67929 |
11.79 |
| 2026-02-23 12:00 |
13:53:51.29 |
-01:25:25.1 |
HIP 67929 |
13.59 |
| 2026-02-24 00:00 |
13:53:45.60 |
-01:23:51.3 |
HIP 67929 |
15.50 |