325P/Yang-Gao
| Parameter |
Value |
| Designation |
325P/Yang-Gao |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2009-05-22T10:39:09.037440Z |
| Orbit solution date (soln_date, UTC) |
2024-06-14T15:42:23Z |
| Obs used |
1380 |
| NEO |
Yes |
| M1 |
15.400 |
| K1 |
14.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
1951-05-28T04:33:01.440000Z |
| Discovery magnitude (MPC) |
14.00 T |
| Discovery observatory (MPC) |
711 · McDonald Observatory, Fort Davis |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2012-02-21.0000000 |
| e |
0.62430563 |
| q (au) |
1.279484 |
| a (au) |
3.405652 |
| i (deg) |
16.332066 |
| Ω (om, deg) |
258.854199 |
| ω (w, deg) |
346.999249 |
| M (ma, deg) |
157.535327 |
Magnitude
Scatter + Global Linear
$$
M_a = (16.250 + 5.930\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
16.250 |
| n |
5.930 |
| gf |
1.000 |
| gb |
-0.578 |
| 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
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
03:55:26.28 |
+22:14:49.0 |
HIP 18471 |
24.20 |
| 2026-02-03 12:00 |
03:55:25.38 |
+22:14:08.1 |
HIP 18459 |
23.97 |
| 2026-02-04 00:00 |
03:55:24.68 |
+22:13:27.8 |
HIP 18459 |
23.62 |
| 2026-02-04 12:00 |
03:55:24.18 |
+22:12:48.2 |
HIP 18459 |
23.27 |
| 2026-02-05 00:00 |
03:55:23.89 |
+22:12:09.2 |
HIP 18459 |
22.90 |
| 2026-02-05 12:00 |
03:55:23.81 |
+22:11:31.0 |
HIP 18459 |
22.51 |
| 2026-02-06 00:00 |
03:55:23.93 |
+22:10:53.4 |
HIP 18459 |
22.10 |
| 2026-02-06 12:00 |
03:55:24.25 |
+22:10:16.5 |
HIP 18459 |
21.67 |
| 2026-02-07 00:00 |
03:55:24.78 |
+22:09:40.3 |
HIP 18459 |
21.22 |
| 2026-02-07 12:00 |
03:55:25.50 |
+22:09:04.8 |
HIP 18459 |
20.75 |
| 2026-02-08 00:00 |
03:55:26.43 |
+22:08:30.0 |
HIP 18459 |
20.25 |
| 2026-02-08 12:00 |
03:55:27.56 |
+22:07:55.8 |
HIP 18459 |
19.72 |
| 2026-02-09 00:00 |
03:55:28.90 |
+22:07:22.3 |
HIP 18459 |
19.17 |
| 2026-02-09 12:00 |
03:55:30.43 |
+22:06:49.5 |
HIP 18459 |
18.58 |
| 2026-02-10 00:00 |
03:55:32.17 |
+22:06:17.3 |
HIP 18459 |
17.97 |
| 2026-02-10 12:00 |
03:55:34.10 |
+22:05:45.9 |
HIP 18459 |
17.32 |
| 2026-02-11 00:00 |
03:55:36.23 |
+22:05:15.1 |
HIP 18459 |
16.64 |
| 2026-02-11 12:00 |
03:55:38.56 |
+22:04:44.9 |
HIP 18459 |
15.93 |
| 2026-02-12 00:00 |
03:55:41.09 |
+22:04:15.5 |
HIP 18459 |
15.19 |
| 2026-02-12 12:00 |
03:55:43.82 |
+22:03:46.7 |
HIP 18459 |
14.41 |
| 2026-02-13 00:00 |
03:55:46.74 |
+22:03:18.6 |
HIP 18459 |
13.60 |
| 2026-02-13 12:00 |
03:55:49.86 |
+22:02:51.1 |
HIP 18459 |
12.75 |
| 2026-02-14 00:00 |
03:55:53.18 |
+22:02:24.3 |
HIP 18459 |
11.86 |
| 2026-02-14 12:00 |
03:55:56.69 |
+22:01:58.2 |
HIP 18459 |
10.94 |
| 2026-02-15 00:00 |
03:56:00.40 |
+22:01:32.8 |
HIP 18459 |
9.98 |
| 2026-02-15 12:00 |
03:56:04.30 |
+22:01:07.9 |
HIP 18459 |
8.99 |
| 2026-02-16 00:00 |
03:56:08.39 |
+22:00:43.8 |
HIP 18459 |
7.96 |
| 2026-02-16 12:00 |
03:56:12.67 |
+22:00:20.3 |
HIP 18459 |
6.89 |
| 2026-02-17 00:00 |
03:56:17.15 |
+21:59:57.4 |
HIP 18459 |
5.79 |
| 2026-02-17 12:00 |
03:56:21.82 |
+21:59:35.2 |
HIP 18459 |
4.66 |
| 2026-02-18 00:00 |
03:56:26.67 |
+21:59:13.7 |
HIP 18459 |
3.50 |
| 2026-02-18 12:00 |
03:56:31.72 |
+21:58:52.7 |
HIP 18459 |
2.33 |
| 2026-02-19 00:00 |
03:56:36.96 |
+21:58:32.4 |
HIP 18459 |
1.25 |
| 2026-02-19 12:00 |
03:56:42.38 |
+21:58:12.8 |
HIP 18459 |
0.97 |
| 2026-02-20 00:00 |
03:56:47.99 |
+21:57:53.8 |
HIP 18459 |
1.97 |
| 2026-02-20 12:00 |
03:56:53.79 |
+21:57:35.4 |
HIP 18459 |
3.27 |
| 2026-02-21 00:00 |
03:56:59.77 |
+21:57:17.6 |
HIP 18459 |
4.66 |
| 2026-02-21 12:00 |
03:57:05.94 |
+21:57:00.4 |
HIP 18459 |
6.10 |
| 2026-02-22 00:00 |
03:57:12.29 |
+21:56:43.9 |
HIP 18459 |
7.59 |
| 2026-02-22 12:00 |
03:57:18.82 |
+21:56:28.0 |
HIP 18459 |
9.12 |
| 2026-02-23 00:00 |
03:57:25.53 |
+21:56:12.7 |
HIP 18459 |
10.70 |
| 2026-02-23 12:00 |
03:57:32.42 |
+21:55:57.9 |
HIP 18459 |
12.32 |
| 2026-02-24 00:00 |
03:57:39.50 |
+21:55:43.8 |
HIP 18459 |
13.97 |