| 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) |
| 2026-03-26 00:00 |
20:21:24.84 |
-18:26:56.5 |
HIP 100348 |
9.37 |
| 2026-03-26 12:00 |
20:21:44.97 |
-18:25:40.1 |
HIP 100348 |
12.11 |
| 2026-03-27 00:00 |
20:22:04.96 |
-18:24:24.0 |
HIP 100533 |
15.40 |
| 2026-03-27 12:00 |
20:22:24.80 |
-18:23:08.2 |
HIP 100533 |
10.53 |
| 2026-03-28 00:00 |
20:22:44.48 |
-18:21:52.7 |
HIP 100533 |
5.69 |
| 2026-03-28 12:00 |
20:23:04.02 |
-18:20:37.6 |
HIP 100533 |
0.90 |
| 2026-03-29 00:00 |
20:23:23.40 |
-18:19:22.7 |
HIP 100533 |
3.88 |
| 2026-03-29 12:00 |
20:23:42.63 |
-18:18:08.3 |
HIP 100533 |
8.61 |
| 2026-03-30 00:00 |
20:24:01.71 |
-18:16:54.1 |
HIP 100533 |
13.30 |
| 2026-03-30 12:00 |
20:24:20.63 |
-18:15:40.4 |
HIP 100533 |
17.96 |
| 2026-03-31 00:00 |
20:24:39.40 |
-18:14:26.9 |
HIP 100533 |
22.58 |
| 2026-03-31 12:00 |
20:24:58.01 |
-18:13:13.9 |
HIP 100770 |
20.59 |
| 2026-04-01 00:00 |
20:25:16.47 |
-18:12:01.2 |
HIP 100770 |
19.14 |
| 2026-04-01 12:00 |
20:25:34.76 |
-18:10:48.8 |
HIP 100770 |
18.71 |
| 2026-04-02 00:00 |
20:25:52.90 |
-18:09:36.9 |
HIP 100770 |
19.35 |
| 2026-04-02 12:00 |
20:26:10.88 |
-18:08:25.3 |
HIP 100881 |
16.78 |
| 2026-04-03 00:00 |
20:26:28.71 |
-18:07:14.2 |
HIP 100881 |
13.18 |
| 2026-04-03 12:00 |
20:26:46.37 |
-18:06:03.4 |
HIP 100881 |
10.25 |
| 2026-04-04 00:00 |
20:27:03.86 |
-18:04:53.0 |
HIP 100881 |
8.63 |
| 2026-04-04 12:00 |
20:27:21.20 |
-18:03:43.1 |
HIP 100931 |
7.16 |
| 2026-04-05 00:00 |
20:27:38.37 |
-18:02:33.5 |
HIP 100931 |
3.15 |
| 2026-04-05 12:00 |
20:27:55.38 |
-18:01:24.4 |
HIP 100931 |
2.13 |
| 2026-04-06 00:00 |
20:28:12.23 |
-18:00:15.7 |
HIP 100931 |
5.84 |
| 2026-04-06 12:00 |
20:28:28.90 |
-17:59:07.4 |
HIP 100931 |
9.88 |
| 2026-04-07 00:00 |
20:28:45.42 |
-17:57:59.6 |
HIP 101040 |
6.58 |
| 2026-04-07 12:00 |
20:29:01.76 |
-17:56:52.3 |
HIP 101040 |
4.37 |
| 2026-04-08 00:00 |
20:29:17.93 |
-17:55:45.3 |
HIP 101040 |
5.24 |
| 2026-04-08 12:00 |
20:29:33.94 |
-17:54:38.9 |
HIP 101040 |
8.20 |
| 2026-04-09 00:00 |
20:29:49.77 |
-17:53:32.9 |
HIP 101040 |
11.73 |
| 2026-04-09 12:00 |
20:30:05.43 |
-17:52:27.4 |
HIP 101040 |
15.41 |
| 2026-04-10 00:00 |
20:30:20.92 |
-17:51:22.4 |
HIP 101040 |
19.13 |
| 2026-04-10 12:00 |
20:30:36.24 |
-17:50:17.8 |
HIP 101249 |
18.58 |
| 2026-04-11 00:00 |
20:30:51.38 |
-17:49:13.8 |
HIP 101249 |
17.55 |
| 2026-04-11 12:00 |
20:31:06.35 |
-17:48:10.2 |
HIP 101249 |
17.29 |
| 2026-04-12 00:00 |
20:31:21.14 |
-17:47:07.2 |
HIP 101249 |
17.81 |
| 2026-04-12 12:00 |
20:31:35.75 |
-17:46:04.7 |
HIP 101249 |
19.02 |
| 2026-04-13 00:00 |
20:31:50.18 |
-17:45:02.7 |
HIP 101249 |
20.78 |
| 2026-04-13 12:00 |
20:32:04.44 |
-17:44:01.2 |
HIP 101249 |
22.95 |
| 2026-04-14 00:00 |
20:32:18.51 |
-17:43:00.2 |
HIP 101249 |
25.40 |
| 2026-04-14 12:00 |
20:32:32.40 |
-17:41:59.8 |
HIP 101249 |
28.04 |
| 2026-04-15 00:00 |
20:32:46.11 |
-17:41:00.0 |
HIP 101249 |
30.80 |
| 2026-04-15 12:00 |
20:32:59.64 |
-17:40:00.7 |
HIP 101249 |
33.65 |
| 2026-04-16 00:00 |
20:33:12.98 |
-17:39:02.0 |
HIP 101596 |
32.35 |