| Parameter |
Value |
| Designation |
447P/Sheppard-Tholen |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2022-08-01T11:34:43.152960Z |
| Orbit solution date (soln_date, UTC) |
2022-12-23T17:43:31Z |
| Obs used |
75 |
| NEO |
- |
| M1 |
7.600 |
| K1 |
16.500 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2008-10-09T08:24:27.648000Z |
| Discovery magnitude (MPC) |
22.60 V |
| Discovery observatory (MPC) |
G96 · University of Arizona Mt. Lemmon Survey |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2017-05-24.0000000 |
| e |
0.18072317 |
| q (au) |
4.665883 |
| a (au) |
5.695124 |
| i (deg) |
7.414149 |
| Ω (om, deg) |
302.834446 |
| ω (w, deg) |
95.085999 |
| M (ma, deg) |
222.542292 |
Magnitude
Scatter + Global Linear
$$
M_a = (7.659 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
7.659 |
| 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
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-06-01 00:00 |
10:06:16.94 |
+06:47:40.3 |
HIP 49519 |
8.40 |
| 2026-06-01 12:00 |
10:06:27.10 |
+06:46:53.7 |
HIP 49519 |
7.88 |
| 2026-06-02 00:00 |
10:06:37.39 |
+06:46:06.3 |
HIP 49519 |
8.24 |
| 2026-06-02 12:00 |
10:06:47.80 |
+06:45:18.2 |
HIP 49519 |
9.39 |
| 2026-06-03 00:00 |
10:06:58.32 |
+06:44:29.4 |
HIP 49519 |
11.13 |
| 2026-06-03 12:00 |
10:07:08.96 |
+06:43:39.8 |
HIP 49519 |
13.23 |
| 2026-06-04 00:00 |
10:07:19.72 |
+06:42:49.4 |
HIP 49519 |
15.57 |
| 2026-06-04 12:00 |
10:07:30.60 |
+06:41:58.3 |
HIP 49519 |
18.08 |
| 2026-06-05 00:00 |
10:07:41.60 |
+06:41:06.5 |
HIP 49704 |
16.68 |
| 2026-06-05 12:00 |
10:07:52.71 |
+06:40:14.0 |
HIP 49704 |
14.10 |
| 2026-06-06 00:00 |
10:08:03.93 |
+06:39:20.7 |
HIP 49704 |
11.63 |
| 2026-06-06 12:00 |
10:08:15.27 |
+06:38:26.7 |
HIP 49704 |
9.41 |
| 2026-06-07 00:00 |
10:08:26.73 |
+06:37:31.9 |
HIP 49704 |
7.70 |
| 2026-06-07 12:00 |
10:08:38.29 |
+06:36:36.5 |
HIP 49704 |
6.91 |
| 2026-06-08 00:00 |
10:08:49.97 |
+06:35:40.2 |
HIP 49704 |
7.39 |
| 2026-06-08 12:00 |
10:09:01.76 |
+06:34:43.3 |
HIP 49704 |
8.97 |
| 2026-06-09 00:00 |
10:09:13.67 |
+06:33:45.7 |
HIP 49704 |
11.22 |
| 2026-06-09 12:00 |
10:09:25.68 |
+06:32:47.3 |
HIP 49704 |
13.83 |
| 2026-06-10 00:00 |
10:09:37.80 |
+06:31:48.2 |
HIP 49704 |
16.66 |
| 2026-06-10 12:00 |
10:09:50.03 |
+06:30:48.4 |
HIP 49704 |
19.62 |
| 2026-06-11 00:00 |
10:10:02.37 |
+06:29:47.8 |
HIP 49704 |
22.67 |
| 2026-06-11 12:00 |
10:10:14.82 |
+06:28:46.6 |
HIP 49888 |
23.36 |
| 2026-06-12 00:00 |
10:10:27.38 |
+06:27:44.6 |
HIP 49888 |
20.75 |
| 2026-06-12 12:00 |
10:10:40.04 |
+06:26:41.9 |
HIP 49888 |
18.33 |
| 2026-06-13 00:00 |
10:10:52.80 |
+06:25:38.6 |
HIP 49888 |
16.22 |
| 2026-06-13 12:00 |
10:11:05.68 |
+06:24:34.5 |
HIP 49888 |
14.56 |
| 2026-06-14 00:00 |
10:11:18.65 |
+06:23:29.7 |
HIP 49888 |
13.54 |
| 2026-06-14 12:00 |
10:11:31.73 |
+06:22:24.2 |
HIP 49888 |
13.33 |
| 2026-06-15 00:00 |
10:11:44.92 |
+06:21:18.0 |
HIP 49888 |
14.00 |
| 2026-06-15 12:00 |
10:11:58.20 |
+06:20:11.1 |
HIP 49888 |
15.44 |
| 2026-06-16 00:00 |
10:12:11.59 |
+06:19:03.5 |
HIP 49888 |
17.48 |
| 2026-06-16 12:00 |
10:12:25.07 |
+06:17:55.2 |
HIP 49888 |
19.96 |
| 2026-06-17 00:00 |
10:12:38.66 |
+06:16:46.3 |
HIP 50112 |
21.89 |
| 2026-06-17 12:00 |
10:12:52.34 |
+06:15:36.6 |
HIP 50112 |
18.46 |
| 2026-06-18 00:00 |
10:13:06.12 |
+06:14:26.3 |
HIP 50112 |
15.07 |
| 2026-06-18 12:00 |
10:13:20.00 |
+06:13:15.3 |
HIP 50112 |
11.80 |
| 2026-06-19 00:00 |
10:13:33.98 |
+06:12:03.6 |
HIP 50112 |
8.81 |
| 2026-06-19 12:00 |
10:13:48.05 |
+06:10:51.2 |
HIP 50112 |
6.53 |
| 2026-06-20 00:00 |
10:14:02.21 |
+06:09:38.2 |
HIP 50112 |
5.93 |
| 2026-06-20 12:00 |
10:14:16.47 |
+06:08:24.5 |
HIP 50112 |
7.46 |
| 2026-06-21 00:00 |
10:14:30.82 |
+06:07:10.1 |
HIP 50112 |
10.23 |
| 2026-06-21 12:00 |
10:14:45.26 |
+06:05:55.1 |
HIP 50112 |
13.52 |
| 2026-06-22 00:00 |
10:14:59.80 |
+06:04:39.5 |
HIP 50112 |
17.05 |