| 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) |
| 2026-07-29 00:00 |
05:46:01.61 |
+22:36:56.1 |
HIP 27222 |
9.65 |
| 2026-07-29 12:00 |
05:46:24.08 |
+22:36:36.4 |
HIP 27222 |
10.24 |
| 2026-07-30 00:00 |
05:46:46.48 |
+22:36:16.5 |
HIP 27320 |
7.99 |
| 2026-07-30 12:00 |
05:47:08.82 |
+22:35:56.2 |
HIP 27320 |
4.43 |
| 2026-07-31 00:00 |
05:47:31.08 |
+22:35:35.7 |
HIP 27320 |
5.35 |
| 2026-07-31 12:00 |
05:47:53.28 |
+22:35:14.8 |
HIP 27388 |
4.97 |
| 2026-08-01 00:00 |
05:48:15.41 |
+22:34:53.7 |
HIP 27388 |
5.34 |
| 2026-08-01 12:00 |
05:48:37.46 |
+22:34:32.3 |
HIP 27388 |
9.19 |
| 2026-08-02 00:00 |
05:48:59.45 |
+22:34:10.6 |
HIP 27388 |
13.86 |
| 2026-08-02 12:00 |
05:49:21.36 |
+22:33:48.5 |
HIP 27550 |
9.54 |
| 2026-08-03 00:00 |
05:49:43.20 |
+22:33:26.2 |
HIP 27550 |
4.49 |
| 2026-08-03 12:00 |
05:50:04.96 |
+22:33:03.6 |
HIP 27550 |
0.60 |
| 2026-08-04 00:00 |
05:50:26.65 |
+22:32:40.8 |
HIP 27550 |
5.58 |
| 2026-08-04 12:00 |
05:50:48.26 |
+22:32:17.6 |
HIP 27627 |
2.81 |
| 2026-08-05 00:00 |
05:51:09.80 |
+22:31:54.1 |
HIP 27627 |
3.35 |
| 2026-08-05 12:00 |
05:51:31.26 |
+22:31:30.4 |
HIP 27627 |
8.01 |
| 2026-08-06 00:00 |
05:51:52.64 |
+22:31:06.3 |
HIP 27627 |
12.88 |
| 2026-08-06 12:00 |
05:52:13.94 |
+22:30:42.0 |
HIP 27627 |
17.78 |
| 2026-08-07 00:00 |
05:52:35.16 |
+22:30:17.4 |
HIP 27627 |
22.68 |
| 2026-08-07 12:00 |
05:52:56.29 |
+22:29:52.5 |
HIP 27828 |
26.07 |
| 2026-08-08 00:00 |
05:53:17.35 |
+22:29:27.3 |
HIP 27956 |
22.39 |
| 2026-08-08 12:00 |
05:53:38.32 |
+22:29:01.9 |
HIP 27956 |
17.61 |
| 2026-08-09 00:00 |
05:53:59.21 |
+22:28:36.2 |
HIP 27956 |
12.92 |
| 2026-08-09 12:00 |
05:54:20.01 |
+22:28:10.2 |
HIP 27956 |
8.41 |
| 2026-08-10 00:00 |
05:54:40.72 |
+22:27:43.9 |
HIP 27956 |
4.63 |
| 2026-08-10 12:00 |
05:55:01.35 |
+22:27:17.3 |
HIP 27956 |
4.26 |
| 2026-08-11 00:00 |
05:55:21.89 |
+22:26:50.5 |
HIP 27956 |
7.78 |
| 2026-08-11 12:00 |
05:55:42.34 |
+22:26:23.4 |
HIP 27956 |
12.16 |
| 2026-08-12 00:00 |
05:56:02.69 |
+22:25:56.0 |
HIP 27956 |
16.72 |
| 2026-08-12 12:00 |
05:56:22.96 |
+22:25:28.3 |
HIP 28216 |
19.46 |
| 2026-08-13 00:00 |
05:56:43.13 |
+22:25:00.4 |
HIP 28216 |
15.35 |
| 2026-08-13 12:00 |
05:57:03.21 |
+22:24:32.2 |
HIP 28216 |
11.69 |
| 2026-08-14 00:00 |
05:57:23.19 |
+22:24:03.8 |
HIP 28216 |
9.04 |
| 2026-08-14 12:00 |
05:57:43.08 |
+22:23:35.1 |
HIP 28216 |
8.36 |
| 2026-08-15 00:00 |
05:58:02.87 |
+22:23:06.1 |
HIP 28216 |
10.03 |
| 2026-08-15 12:00 |
05:58:22.56 |
+22:22:36.9 |
HIP 28216 |
13.16 |
| 2026-08-16 00:00 |
05:58:42.15 |
+22:22:07.4 |
HIP 28355 |
16.72 |
| 2026-08-16 12:00 |
05:59:01.64 |
+22:21:37.6 |
HIP 28355 |
14.66 |
| 2026-08-17 00:00 |
05:59:21.04 |
+22:21:07.6 |
HIP 28355 |
13.85 |
| 2026-08-17 12:00 |
05:59:40.33 |
+22:20:37.3 |
HIP 28355 |
14.46 |
| 2026-08-18 00:00 |
05:59:59.52 |
+22:20:06.8 |
HIP 28355 |
16.32 |
| 2026-08-18 12:00 |
06:00:18.60 |
+22:19:36.1 |
HIP 28355 |
19.06 |
| 2026-08-19 00:00 |
06:00:37.58 |
+22:19:05.1 |
HIP 28561 |
15.62 |