| Parameter |
Value |
| Designation |
30P/Reinmuth 1 |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2017-08-19T01:40:55.568640Z |
| Orbit solution date (soln_date, UTC) |
2025-09-30T14:15:16Z |
| Obs used |
2543 |
| NEO |
- |
| M1 |
13.600 |
| K1 |
7.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2016-04-19.0000000 |
| e |
0.50225502 |
| q (au) |
1.876931 |
| a (au) |
3.770870 |
| i (deg) |
8.128534 |
| Ω (om, deg) |
119.715299 |
| ω (w, deg) |
13.245201 |
| M (ma, deg) |
294.440858 |
Magnitude
Scatter + Global Linear
$$
M_a = (13.317 + 2.368\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
13.317 |
| n |
2.368 |
| gf |
0.999 |
| gb |
-0.504 |
| k |
1.000 |
| 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
Finding Chart
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
17:34:30.64 |
-19:10:11.1 |
HIP 85965 |
5.08 |
| 2026-07-29 12:00 |
17:34:19.08 |
-19:10:44.4 |
HIP 85965 |
2.35 |
| 2026-07-30 00:00 |
17:34:07.73 |
-19:11:17.8 |
HIP 85965 |
0.87 |
| 2026-07-30 12:00 |
17:33:56.60 |
-19:11:51.4 |
HIP 85965 |
3.27 |
| 2026-07-31 00:00 |
17:33:45.68 |
-19:12:25.1 |
HIP 85965 |
5.87 |
| 2026-07-31 12:00 |
17:33:34.98 |
-19:12:59.0 |
HIP 85965 |
8.45 |
| 2026-08-01 00:00 |
17:33:24.49 |
-19:13:33.0 |
HIP 85965 |
10.98 |
| 2026-08-01 12:00 |
17:33:14.22 |
-19:14:07.2 |
HIP 85965 |
13.47 |
| 2026-08-02 00:00 |
17:33:04.16 |
-19:14:41.5 |
HIP 85965 |
15.91 |
| 2026-08-02 12:00 |
17:32:54.32 |
-19:15:16.0 |
HIP 85965 |
18.30 |
| 2026-08-03 00:00 |
17:32:44.70 |
-19:15:50.6 |
HIP 85965 |
20.65 |
| 2026-08-03 12:00 |
17:32:35.30 |
-19:16:25.3 |
HIP 85965 |
22.94 |
| 2026-08-04 00:00 |
17:32:26.11 |
-19:17:00.2 |
HIP 85965 |
25.18 |
| 2026-08-04 12:00 |
17:32:17.15 |
-19:17:35.2 |
HIP 85690 |
25.13 |
| 2026-08-05 00:00 |
17:32:08.41 |
-19:18:10.4 |
HIP 85690 |
23.56 |
| 2026-08-05 12:00 |
17:31:59.89 |
-19:18:45.7 |
HIP 85690 |
22.12 |
| 2026-08-06 00:00 |
17:31:51.59 |
-19:19:21.2 |
HIP 85690 |
20.84 |
| 2026-08-06 12:00 |
17:31:43.51 |
-19:19:56.8 |
HIP 85690 |
19.73 |
| 2026-08-07 00:00 |
17:31:35.66 |
-19:20:32.6 |
HIP 85690 |
18.81 |
| 2026-08-07 12:00 |
17:31:28.03 |
-19:21:08.5 |
HIP 85690 |
18.09 |
| 2026-08-08 00:00 |
17:31:20.63 |
-19:21:44.5 |
HIP 85690 |
17.57 |
| 2026-08-08 12:00 |
17:31:13.45 |
-19:22:20.7 |
HIP 85690 |
17.26 |
| 2026-08-09 00:00 |
17:31:06.49 |
-19:22:57.0 |
HIP 85690 |
17.16 |
| 2026-08-09 12:00 |
17:30:59.76 |
-19:23:33.5 |
HIP 85690 |
17.25 |
| 2026-08-10 00:00 |
17:30:53.26 |
-19:24:10.1 |
HIP 85617 |
16.94 |
| 2026-08-10 12:00 |
17:30:46.99 |
-19:24:46.8 |
HIP 85617 |
15.36 |
| 2026-08-11 00:00 |
17:30:40.94 |
-19:25:23.7 |
HIP 85617 |
13.83 |
| 2026-08-11 12:00 |
17:30:35.12 |
-19:26:00.7 |
HIP 85617 |
12.36 |
| 2026-08-12 00:00 |
17:30:29.53 |
-19:26:37.8 |
HIP 85617 |
10.95 |
| 2026-08-12 12:00 |
17:30:24.17 |
-19:27:15.1 |
HIP 85617 |
9.61 |
| 2026-08-13 00:00 |
17:30:19.03 |
-19:27:52.5 |
HIP 85617 |
8.35 |
| 2026-08-13 12:00 |
17:30:14.12 |
-19:28:30.0 |
HIP 85617 |
7.18 |
| 2026-08-14 00:00 |
17:30:09.45 |
-19:29:07.7 |
HIP 85617 |
6.12 |
| 2026-08-14 12:00 |
17:30:05.00 |
-19:29:45.5 |
HIP 85617 |
5.21 |
| 2026-08-15 00:00 |
17:30:00.78 |
-19:30:23.3 |
HIP 85617 |
4.50 |
| 2026-08-15 12:00 |
17:29:56.78 |
-19:31:01.4 |
HIP 85617 |
4.07 |
| 2026-08-16 00:00 |
17:29:53.02 |
-19:31:39.5 |
HIP 85617 |
3.95 |
| 2026-08-16 12:00 |
17:29:49.48 |
-19:32:17.8 |
HIP 85617 |
4.15 |
| 2026-08-17 00:00 |
17:29:46.18 |
-19:32:56.1 |
HIP 85617 |
4.59 |
| 2026-08-17 12:00 |
17:29:43.10 |
-19:33:34.6 |
HIP 85617 |
5.20 |
| 2026-08-18 00:00 |
17:29:40.24 |
-19:34:13.2 |
HIP 85617 |
5.89 |
| 2026-08-18 12:00 |
17:29:37.62 |
-19:34:51.9 |
HIP 85617 |
6.64 |
| 2026-08-19 00:00 |
17:29:35.22 |
-19:35:30.7 |
HIP 85617 |
7.40 |