| Parameter |
Value |
| Designation |
P/2024 FG9 (Nanshan-Hahn) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2024-05-20T07:32:21.894720Z |
| Orbit solution date (soln_date, UTC) |
2024-10-26T00:12:24Z |
| Obs used |
136 |
| NEO |
- |
| M1 |
10.400 |
| K1 |
32.000 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2024-01-04.0000000 |
| e |
0.50988575 |
| q (au) |
1.596425 |
| a (au) |
3.257251 |
| i (deg) |
1.731019 |
| Ω (om, deg) |
253.044065 |
| ω (w, deg) |
245.894898 |
| M (ma, deg) |
336.978031 |
Magnitude
Scatter + Global Linear
$$
M_a = (H_0 + n\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
- |
| n |
- |
| gf |
- |
| gb |
- |
| k |
- |
| δ90 |
- |
| 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) |
| 2026-07-29 00:00 |
20:06:23.74 |
-18:35:27.3 |
HIP 99011 |
8.44 |
| 2026-07-29 12:00 |
20:06:02.30 |
-18:36:30.6 |
HIP 99011 |
5.75 |
| 2026-07-30 00:00 |
20:05:40.91 |
-18:37:33.7 |
HIP 99011 |
6.98 |
| 2026-07-30 12:00 |
20:05:19.56 |
-18:38:36.7 |
HIP 98901 |
8.71 |
| 2026-07-31 00:00 |
20:04:58.28 |
-18:39:39.4 |
HIP 98901 |
6.68 |
| 2026-07-31 12:00 |
20:04:37.05 |
-18:40:41.9 |
HIP 98901 |
8.14 |
| 2026-08-01 00:00 |
20:04:15.88 |
-18:41:44.1 |
HIP 98901 |
11.85 |
| 2026-08-01 12:00 |
20:03:54.77 |
-18:42:46.1 |
HIP 98901 |
16.32 |
| 2026-08-02 00:00 |
20:03:33.74 |
-18:43:47.9 |
HIP 98707 |
14.37 |
| 2026-08-02 12:00 |
20:03:12.77 |
-18:44:49.4 |
HIP 98707 |
12.78 |
| 2026-08-03 00:00 |
20:02:51.89 |
-18:45:50.7 |
HIP 98707 |
13.10 |
| 2026-08-03 12:00 |
20:02:31.07 |
-18:46:51.6 |
HIP 98707 |
15.18 |
| 2026-08-04 00:00 |
20:02:10.34 |
-18:47:52.4 |
HIP 98634 |
18.21 |
| 2026-08-04 12:00 |
20:01:49.70 |
-18:48:52.8 |
HIP 98634 |
17.28 |
| 2026-08-05 00:00 |
20:01:29.14 |
-18:49:52.9 |
HIP 98634 |
17.76 |
| 2026-08-05 12:00 |
20:01:08.67 |
-18:50:52.7 |
HIP 98634 |
19.53 |
| 2026-08-06 00:00 |
20:00:48.30 |
-18:51:52.2 |
HIP 98634 |
22.25 |
| 2026-08-06 12:00 |
20:00:28.03 |
-18:52:51.4 |
HIP 98634 |
25.62 |
| 2026-08-07 00:00 |
20:00:07.85 |
-18:53:50.2 |
HIP 98634 |
29.40 |
| 2026-08-07 12:00 |
19:59:47.78 |
-18:54:48.8 |
HIP 98634 |
33.44 |
| 2026-08-08 00:00 |
19:59:27.82 |
-18:55:47.0 |
HIP 98634 |
37.65 |
| 2026-08-08 12:00 |
19:59:07.97 |
-18:56:44.8 |
HIP 98634 |
41.96 |
| 2026-08-09 00:00 |
19:58:48.23 |
-18:57:42.3 |
HIP 98078 |
40.88 |
| 2026-08-09 12:00 |
19:58:28.61 |
-18:58:39.4 |
HIP 98078 |
36.43 |
| 2026-08-10 00:00 |
19:58:09.11 |
-18:59:36.1 |
HIP 98078 |
32.09 |
| 2026-08-10 12:00 |
19:57:49.73 |
-19:00:32.5 |
HIP 98078 |
27.89 |
| 2026-08-11 00:00 |
19:57:30.48 |
-19:01:28.5 |
HIP 98078 |
23.90 |
| 2026-08-11 12:00 |
19:57:11.35 |
-19:02:24.0 |
HIP 98078 |
20.22 |
| 2026-08-12 00:00 |
19:56:52.37 |
-19:03:19.2 |
HIP 98078 |
17.02 |
| 2026-08-12 12:00 |
19:56:33.51 |
-19:04:14.0 |
HIP 98078 |
14.60 |
| 2026-08-13 00:00 |
19:56:14.80 |
-19:05:08.4 |
HIP 98078 |
13.34 |
| 2026-08-13 12:00 |
19:55:56.23 |
-19:06:02.3 |
HIP 98078 |
13.54 |
| 2026-08-14 00:00 |
19:55:37.80 |
-19:06:55.8 |
HIP 98045 |
11.13 |
| 2026-08-14 12:00 |
19:55:19.52 |
-19:07:48.9 |
HIP 98045 |
9.81 |
| 2026-08-15 00:00 |
19:55:01.39 |
-19:08:41.5 |
HIP 98045 |
10.36 |
| 2026-08-15 12:00 |
19:54:43.41 |
-19:09:33.7 |
HIP 98045 |
12.49 |
| 2026-08-16 00:00 |
19:54:25.59 |
-19:10:25.5 |
HIP 98045 |
15.53 |
| 2026-08-16 12:00 |
19:54:07.93 |
-19:11:16.8 |
HIP 97858 |
14.23 |
| 2026-08-17 00:00 |
19:53:50.42 |
-19:12:07.6 |
HIP 97858 |
10.06 |
| 2026-08-17 12:00 |
19:53:33.09 |
-19:12:57.9 |
HIP 97858 |
6.00 |
| 2026-08-18 00:00 |
19:53:15.91 |
-19:13:47.8 |
HIP 97858 |
2.41 |
| 2026-08-18 12:00 |
19:52:58.91 |
-19:14:37.3 |
HIP 97858 |
3.11 |
| 2026-08-19 00:00 |
19:52:42.07 |
-19:15:26.2 |
HIP 97858 |
6.82 |