| Parameter |
Value |
| Designation |
304P/Ory |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2008-10-19T17:18:25.943040Z |
| Orbit solution date (soln_date, UTC) |
2022-05-19T21:14:15Z |
| Obs used |
1496 |
| NEO |
- |
| M1 |
15.100 |
| K1 |
14.750 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2011-07-30.0000000 |
| e |
0.57417592 |
| q (au) |
1.381374 |
| a (au) |
3.244002 |
| i (deg) |
2.755646 |
| Ω (om, deg) |
60.682083 |
| ω (w, deg) |
329.661369 |
| M (ma, deg) |
170.927265 |
Magnitude
Scatter + Global Linear
$$
M_a = (13.926 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
13.926 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-1.000 |
| 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) |
| 2026-06-01 00:00 |
05:30:39.59 |
+24:08:17.1 |
HIP 25687 |
21.40 |
| 2026-06-01 12:00 |
05:32:19.61 |
+24:09:51.5 |
HIP 26062 |
32.24 |
| 2026-06-02 00:00 |
05:33:59.43 |
+24:11:21.6 |
HIP 26201 |
15.84 |
| 2026-06-02 12:00 |
05:35:39.06 |
+24:12:47.4 |
HIP 26201 |
9.33 |
| 2026-06-03 00:00 |
05:37:18.48 |
+24:14:09.1 |
HIP 26248 |
28.00 |
| 2026-06-03 12:00 |
05:38:57.70 |
+24:15:26.6 |
HIP 26651 |
12.41 |
| 2026-06-04 00:00 |
05:40:36.71 |
+24:16:40.0 |
HIP 26761 |
7.86 |
| 2026-06-04 12:00 |
05:42:15.51 |
+24:17:49.2 |
HIP 26839 |
4.37 |
| 2026-06-05 00:00 |
05:43:54.11 |
+24:18:54.4 |
HIP 27135 |
19.19 |
| 2026-06-05 12:00 |
05:45:32.50 |
+24:19:55.4 |
HIP 27135 |
6.80 |
| 2026-06-06 00:00 |
05:47:10.67 |
+24:20:52.5 |
HIP 27381 |
12.73 |
| 2026-06-06 12:00 |
05:48:48.63 |
+24:21:45.5 |
HIP 27468 |
12.61 |
| 2026-06-07 00:00 |
05:50:26.38 |
+24:22:34.5 |
HIP 27468 |
22.57 |
| 2026-06-07 12:00 |
05:52:03.91 |
+24:23:19.5 |
HIP 27851 |
21.34 |
| 2026-06-08 00:00 |
05:53:41.22 |
+24:24:00.6 |
HIP 27851 |
7.00 |
| 2026-06-08 12:00 |
05:55:18.32 |
+24:24:37.8 |
HIP 27906 |
14.42 |
| 2026-06-09 00:00 |
05:56:55.19 |
+24:25:11.0 |
HIP 28124 |
3.34 |
| 2026-06-09 12:00 |
05:58:31.84 |
+24:25:40.5 |
HIP 28238 |
13.43 |
| 2026-06-10 00:00 |
06:00:08.27 |
+24:26:06.0 |
HIP 28472 |
7.81 |
| 2026-06-10 12:00 |
06:01:44.48 |
+24:26:27.8 |
HIP 28472 |
14.57 |
| 2026-06-11 00:00 |
06:03:20.45 |
+24:26:45.8 |
HIP 28684 |
22.64 |
| 2026-06-11 12:00 |
06:04:56.21 |
+24:27:00.0 |
HIP 28871 |
21.22 |
| 2026-06-12 00:00 |
06:06:31.73 |
+24:27:10.4 |
HIP 28977 |
9.99 |
| 2026-06-12 12:00 |
06:08:07.02 |
+24:27:17.2 |
HIP 29148 |
12.63 |
| 2026-06-13 00:00 |
06:09:42.08 |
+24:27:20.3 |
HIP 29148 |
11.85 |
| 2026-06-13 12:00 |
06:11:16.91 |
+24:27:19.8 |
HIP 29379 |
4.09 |
| 2026-06-14 00:00 |
06:12:51.50 |
+24:27:15.6 |
HIP 29558 |
17.32 |
| 2026-06-14 12:00 |
06:14:25.86 |
+24:27:07.8 |
HIP 29558 |
16.86 |
| 2026-06-15 00:00 |
06:15:59.98 |
+24:26:56.5 |
HIP 29789 |
29.07 |
| 2026-06-15 12:00 |
06:17:33.86 |
+24:26:41.6 |
HIP 29789 |
33.21 |
| 2026-06-16 00:00 |
06:19:07.50 |
+24:26:23.2 |
HIP 30102 |
15.15 |
| 2026-06-16 12:00 |
06:20:40.90 |
+24:26:01.4 |
HIP 30102 |
11.41 |
| 2026-06-17 00:00 |
06:22:14.06 |
+24:25:36.1 |
HIP 30254 |
14.36 |
| 2026-06-17 12:00 |
06:23:46.97 |
+24:25:07.3 |
HIP 30528 |
18.23 |
| 2026-06-18 00:00 |
06:25:19.64 |
+24:24:35.2 |
HIP 30528 |
7.74 |
| 2026-06-18 12:00 |
06:26:52.07 |
+24:23:59.7 |
HIP 30755 |
13.10 |
| 2026-06-19 00:00 |
06:28:24.25 |
+24:23:20.9 |
HIP 30755 |
9.72 |
| 2026-06-19 12:00 |
06:29:56.18 |
+24:22:38.8 |
HIP 31046 |
12.48 |
| 2026-06-20 00:00 |
06:31:27.86 |
+24:21:53.4 |
HIP 31046 |
8.49 |
| 2026-06-20 12:00 |
06:32:59.29 |
+24:21:04.7 |
HIP 31254 |
19.10 |
| 2026-06-21 00:00 |
06:34:30.47 |
+24:20:12.9 |
HIP 31388 |
11.97 |
| 2026-06-21 12:00 |
06:36:01.40 |
+24:19:17.8 |
HIP 31631 |
15.79 |
| 2026-06-22 00:00 |
06:37:32.08 |
+24:18:19.6 |
HIP 31631 |
7.89 |