| 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) |
| 2026-03-26 00:00 |
01:34:10.48 |
+09:19:21.5 |
HIP 7293 |
20.07 |
| 2026-03-26 12:00 |
01:35:55.02 |
+09:30:09.4 |
HIP 7561 |
22.74 |
| 2026-03-27 00:00 |
01:37:39.65 |
+09:40:55.3 |
HIP 7561 |
6.46 |
| 2026-03-27 12:00 |
01:39:24.39 |
+09:51:39.1 |
HIP 7604 |
22.30 |
| 2026-03-28 00:00 |
01:41:09.21 |
+10:02:20.7 |
HIP 7987 |
24.63 |
| 2026-03-28 12:00 |
01:42:54.14 |
+10:13:00.0 |
HIP 7987 |
4.80 |
| 2026-03-29 00:00 |
01:44:39.15 |
+10:23:37.0 |
HIP 8033 |
22.00 |
| 2026-03-29 12:00 |
01:46:24.26 |
+10:34:11.7 |
HIP 8306 |
19.81 |
| 2026-03-30 00:00 |
01:48:09.46 |
+10:44:44.0 |
HIP 8306 |
15.96 |
| 2026-03-30 12:00 |
01:49:54.75 |
+10:55:13.8 |
HIP 8588 |
15.87 |
| 2026-03-31 00:00 |
01:51:40.14 |
+11:05:41.1 |
HIP 8588 |
12.20 |
| 2026-03-31 12:00 |
01:53:25.61 |
+11:16:05.8 |
HIP 8888 |
16.55 |
| 2026-04-01 00:00 |
01:55:11.16 |
+11:26:27.9 |
HIP 8888 |
11.65 |
| 2026-04-01 12:00 |
01:56:56.81 |
+11:36:47.4 |
HIP 9080 |
3.03 |
| 2026-04-02 00:00 |
01:58:42.54 |
+11:47:04.2 |
HIP 9080 |
27.10 |
| 2026-04-02 12:00 |
02:00:28.35 |
+11:57:18.1 |
HIP 9295 |
25.48 |
| 2026-04-03 00:00 |
02:02:14.25 |
+12:07:29.3 |
HIP 9490 |
3.95 |
| 2026-04-03 12:00 |
02:04:00.23 |
+12:17:37.6 |
HIP 9607 |
18.70 |
| 2026-04-04 00:00 |
02:05:46.29 |
+12:27:43.0 |
HIP 9764 |
17.94 |
| 2026-04-04 12:00 |
02:07:32.43 |
+12:37:45.5 |
HIP 9764 |
40.41 |
| 2026-04-05 00:00 |
02:09:18.66 |
+12:47:44.9 |
HIP 10094 |
23.79 |
| 2026-04-05 12:00 |
02:11:04.95 |
+12:57:41.3 |
HIP 10094 |
23.02 |
| 2026-04-06 00:00 |
02:12:51.33 |
+13:07:34.6 |
HIP 10329 |
5.49 |
| 2026-04-06 12:00 |
02:14:37.78 |
+13:17:24.7 |
HIP 10329 |
27.00 |
| 2026-04-07 00:00 |
02:16:24.30 |
+13:27:11.6 |
HIP 10730 |
24.76 |
| 2026-04-07 12:00 |
02:18:10.90 |
+13:36:55.3 |
HIP 10730 |
11.20 |
| 2026-04-08 00:00 |
02:19:57.56 |
+13:46:35.7 |
HIP 10921 |
11.95 |
| 2026-04-08 12:00 |
02:21:44.30 |
+13:56:12.8 |
HIP 10921 |
22.49 |
| 2026-04-09 00:00 |
02:23:31.10 |
+14:05:46.5 |
HIP 11259 |
34.37 |
| 2026-04-09 12:00 |
02:25:17.97 |
+14:15:16.8 |
HIP 11298 |
17.48 |
| 2026-04-10 00:00 |
02:27:04.90 |
+14:24:43.6 |
HIP 11298 |
24.81 |
| 2026-04-10 12:00 |
02:28:51.90 |
+14:34:06.9 |
HIP 11512 |
13.45 |
| 2026-04-11 00:00 |
02:30:38.96 |
+14:43:26.6 |
HIP 11672 |
27.79 |
| 2026-04-11 12:00 |
02:32:26.08 |
+14:52:42.8 |
HIP 11843 |
11.55 |
| 2026-04-12 00:00 |
02:34:13.25 |
+15:01:55.3 |
HIP 11843 |
19.10 |
| 2026-04-12 12:00 |
02:36:00.48 |
+15:11:04.1 |
HIP 12125 |
3.50 |
| 2026-04-13 00:00 |
02:37:47.77 |
+15:20:09.2 |
HIP 12125 |
25.69 |
| 2026-04-13 12:00 |
02:39:35.10 |
+15:29:10.5 |
HIP 12553 |
28.95 |
| 2026-04-14 00:00 |
02:41:22.49 |
+15:38:08.1 |
HIP 12553 |
1.59 |
| 2026-04-14 12:00 |
02:43:09.93 |
+15:47:01.8 |
HIP 12763 |
17.32 |
| 2026-04-15 00:00 |
02:44:57.41 |
+15:55:51.6 |
HIP 12742 |
19.42 |
| 2026-04-15 12:00 |
02:46:44.93 |
+16:04:37.5 |
HIP 13145 |
33.56 |
| 2026-04-16 00:00 |
02:48:32.50 |
+16:13:19.5 |
HIP 13145 |
9.66 |