47P/Ashbrook-Jackson
| Parameter |
Value |
| Designation |
47P/Ashbrook-Jackson |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2025-10-26T14:59:33.051840Z |
| Orbit solution date (soln_date, UTC) |
2026-01-13T17:41:17Z |
| Obs used |
2362 |
| NEO |
- |
| M1 |
13.100 |
| K1 |
4.750 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2021-11-12.0000000 |
| e |
0.31852029 |
| q (au) |
2.810097 |
| a (au) |
4.123523 |
| i (deg) |
13.040537 |
| Ω (om, deg) |
356.920723 |
| ω (w, deg) |
357.654924 |
| M (ma, deg) |
189.957897 |
Magnitude
Scatter + Global Linear
$$
M_a = (7.760 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
7.760 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.766 |
| k |
0.996 |
| 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) |
| 2026-02-03 00:00 |
00:02:58.95 |
+04:35:46.4 |
HIP 263 |
7.40 |
| 2026-02-03 12:00 |
00:03:39.34 |
+04:41:06.5 |
HIP 263 |
5.07 |
| 2026-02-04 00:00 |
00:04:19.80 |
+04:46:26.9 |
HIP 263 |
16.02 |
| 2026-02-04 12:00 |
00:05:00.34 |
+04:51:47.6 |
HIP 263 |
27.36 |
| 2026-02-05 00:00 |
00:05:40.95 |
+04:57:08.6 |
HIP 579 |
28.59 |
| 2026-02-05 12:00 |
00:06:21.62 |
+05:02:29.8 |
HIP 579 |
17.94 |
| 2026-02-06 00:00 |
00:07:02.37 |
+05:07:51.4 |
HIP 579 |
9.43 |
| 2026-02-06 12:00 |
00:07:43.19 |
+05:13:13.2 |
HIP 579 |
10.93 |
| 2026-02-07 00:00 |
00:08:24.08 |
+05:18:35.2 |
HIP 579 |
20.37 |
| 2026-02-07 12:00 |
00:09:05.04 |
+05:23:57.5 |
HIP 579 |
31.24 |
| 2026-02-08 00:00 |
00:09:46.07 |
+05:29:20.1 |
HIP 898 |
25.76 |
| 2026-02-08 12:00 |
00:10:27.17 |
+05:34:42.9 |
HIP 898 |
24.06 |
| 2026-02-09 00:00 |
00:11:08.34 |
+05:40:06.0 |
HIP 898 |
27.60 |
| 2026-02-09 12:00 |
00:11:49.57 |
+05:45:29.3 |
HIP 1050 |
20.25 |
| 2026-02-10 00:00 |
00:12:30.87 |
+05:50:52.8 |
HIP 1050 |
15.53 |
| 2026-02-10 12:00 |
00:13:12.24 |
+05:56:16.6 |
HIP 1050 |
18.48 |
| 2026-02-11 00:00 |
00:13:53.67 |
+06:01:40.6 |
HIP 1050 |
26.69 |
| 2026-02-11 12:00 |
00:14:35.17 |
+06:07:04.8 |
HIP 1249 |
22.79 |
| 2026-02-12 00:00 |
00:15:16.74 |
+06:12:29.2 |
HIP 1249 |
22.52 |
| 2026-02-12 12:00 |
00:15:58.37 |
+06:17:53.9 |
HIP 1249 |
27.71 |
| 2026-02-13 00:00 |
00:16:40.06 |
+06:23:18.7 |
HIP 1249 |
36.08 |
| 2026-02-13 12:00 |
00:17:21.82 |
+06:28:43.7 |
HIP 1602 |
42.07 |
| 2026-02-14 00:00 |
00:18:03.64 |
+06:34:08.9 |
HIP 1602 |
34.43 |
| 2026-02-14 12:00 |
00:18:45.52 |
+06:39:34.3 |
HIP 1602 |
29.58 |
| 2026-02-15 00:00 |
00:19:27.46 |
+06:44:59.9 |
HIP 1602 |
28.99 |
| 2026-02-15 12:00 |
00:20:09.47 |
+06:50:25.6 |
HIP 1738 |
29.24 |
| 2026-02-16 00:00 |
00:20:51.54 |
+06:55:51.5 |
HIP 1738 |
17.61 |
| 2026-02-16 12:00 |
00:21:33.66 |
+07:01:17.6 |
HIP 1738 |
6.51 |
| 2026-02-17 00:00 |
00:22:15.85 |
+07:06:43.8 |
HIP 1738 |
7.23 |
| 2026-02-17 12:00 |
00:22:58.10 |
+07:12:10.2 |
HIP 1738 |
18.46 |
| 2026-02-18 00:00 |
00:23:40.40 |
+07:17:36.7 |
HIP 1738 |
30.15 |
| 2026-02-18 12:00 |
00:24:22.76 |
+07:23:03.4 |
HIP 2025 |
26.90 |
| 2026-02-19 00:00 |
00:25:05.18 |
+07:28:30.2 |
HIP 2025 |
15.84 |
| 2026-02-19 12:00 |
00:25:47.66 |
+07:33:57.1 |
HIP 2067 |
6.89 |
| 2026-02-20 00:00 |
00:26:30.19 |
+07:39:24.1 |
HIP 2067 |
5.20 |
| 2026-02-20 12:00 |
00:27:12.78 |
+07:44:51.2 |
HIP 2067 |
16.99 |
| 2026-02-21 00:00 |
00:27:55.42 |
+07:50:18.4 |
HIP 2067 |
28.86 |
| 2026-02-21 12:00 |
00:28:38.11 |
+07:55:45.7 |
HIP 2264 |
27.47 |
| 2026-02-22 00:00 |
00:29:20.86 |
+08:01:13.1 |
HIP 2264 |
23.02 |
| 2026-02-22 12:00 |
00:30:03.67 |
+08:06:40.6 |
HIP 2264 |
24.28 |
| 2026-02-23 00:00 |
00:30:46.52 |
+08:12:08.2 |
HIP 2264 |
30.55 |
| 2026-02-23 12:00 |
00:31:29.43 |
+08:17:35.8 |
HIP 2594 |
20.96 |
| 2026-02-24 00:00 |
00:32:12.38 |
+08:23:03.4 |
HIP 2594 |
12.07 |