| Parameter |
Value |
| Designation |
47P/Ashbrook-Jackson |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2025-10-26T15:31:34.691520Z |
| Orbit solution date (soln_date, UTC) |
2026-03-12T09:26:48Z |
| Obs used |
2380 |
| NEO |
- |
| M1 |
13.100 |
| K1 |
4.750 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2021-11-26.0000000 |
| e |
0.31852959 |
| q (au) |
2.810033 |
| a (au) |
4.123485 |
| i (deg) |
13.040588 |
| Ω (om, deg) |
356.920738 |
| ω (w, deg) |
357.657741 |
| M (ma, deg) |
191.600823 |
Magnitude
Scatter + Global Linear
$$
M_a = (8.013 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
8.013 |
| n |
6.000 |
| gf |
0.999 |
| gb |
-0.737 |
| k |
0.991 |
| δ90 |
9.999 |
| 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 |
01:16:29.92 |
+13:49:09.9 |
HIP 5922 |
6.86 |
| 2026-03-26 12:00 |
01:17:15.34 |
+13:54:31.2 |
HIP 5922 |
18.81 |
| 2026-03-27 00:00 |
01:18:00.79 |
+13:59:52.2 |
HIP 6036 |
16.17 |
| 2026-03-27 12:00 |
01:18:46.27 |
+14:05:12.9 |
HIP 6036 |
20.08 |
| 2026-03-28 00:00 |
01:19:31.78 |
+14:10:33.3 |
HIP 6036 |
29.07 |
| 2026-03-28 12:00 |
01:20:17.31 |
+14:15:53.4 |
HIP 6324 |
26.98 |
| 2026-03-29 00:00 |
01:21:02.88 |
+14:21:13.2 |
HIP 6402 |
17.03 |
| 2026-03-29 12:00 |
01:21:48.47 |
+14:26:32.7 |
HIP 6402 |
8.54 |
| 2026-03-30 00:00 |
01:22:34.09 |
+14:31:52.0 |
HIP 6402 |
12.50 |
| 2026-03-30 12:00 |
01:23:19.74 |
+14:37:10.9 |
HIP 6489 |
20.96 |
| 2026-03-31 00:00 |
01:24:05.41 |
+14:42:29.5 |
HIP 6489 |
28.21 |
| 2026-03-31 12:00 |
01:24:51.12 |
+14:47:47.8 |
HIP 6535 |
32.84 |
| 2026-04-01 00:00 |
01:25:36.84 |
+14:53:05.7 |
HIP 6535 |
34.23 |
| 2026-04-01 12:00 |
01:26:22.60 |
+14:58:23.4 |
HIP 6535 |
39.56 |
| 2026-04-02 00:00 |
01:27:08.38 |
+15:03:40.7 |
HIP 6860 |
39.01 |
| 2026-04-02 12:00 |
01:27:54.19 |
+15:08:57.7 |
HIP 6860 |
40.81 |
| 2026-04-03 00:00 |
01:28:40.03 |
+15:14:14.3 |
HIP 7042 |
33.27 |
| 2026-04-03 12:00 |
01:29:25.89 |
+15:19:30.6 |
HIP 7053 |
25.69 |
| 2026-04-04 00:00 |
01:30:11.78 |
+15:24:46.6 |
HIP 7053 |
13.71 |
| 2026-04-04 12:00 |
01:30:57.70 |
+15:30:02.2 |
HIP 7053 |
3.96 |
| 2026-04-05 00:00 |
01:31:43.64 |
+15:35:17.5 |
HIP 7053 |
11.98 |
| 2026-04-05 12:00 |
01:32:29.60 |
+15:40:32.4 |
HIP 7300 |
22.61 |
| 2026-04-06 00:00 |
01:33:15.59 |
+15:45:47.0 |
HIP 7300 |
10.82 |
| 2026-04-06 12:00 |
01:34:01.61 |
+15:51:01.2 |
HIP 7300 |
4.80 |
| 2026-04-07 00:00 |
01:34:47.65 |
+15:56:15.0 |
HIP 7300 |
15.13 |
| 2026-04-07 12:00 |
01:35:33.72 |
+16:01:28.5 |
HIP 7405 |
18.85 |
| 2026-04-08 00:00 |
01:36:19.81 |
+16:06:41.6 |
HIP 7405 |
18.67 |
| 2026-04-08 12:00 |
01:37:05.93 |
+16:11:54.3 |
HIP 7608 |
16.28 |
| 2026-04-09 00:00 |
01:37:52.07 |
+16:17:06.6 |
HIP 7608 |
4.98 |
| 2026-04-09 12:00 |
01:38:38.23 |
+16:22:18.6 |
HIP 7608 |
9.17 |
| 2026-04-10 00:00 |
01:39:24.42 |
+16:27:30.2 |
HIP 7740 |
5.03 |
| 2026-04-10 12:00 |
01:40:10.63 |
+16:32:41.3 |
HIP 7740 |
10.99 |
| 2026-04-11 00:00 |
01:40:56.87 |
+16:37:52.1 |
HIP 7867 |
8.00 |
| 2026-04-11 12:00 |
01:41:43.13 |
+16:43:02.5 |
HIP 7867 |
14.16 |
| 2026-04-12 00:00 |
01:42:29.41 |
+16:48:12.4 |
HIP 7930 |
17.13 |
| 2026-04-12 12:00 |
01:43:15.71 |
+16:53:22.0 |
HIP 7930 |
21.35 |
| 2026-04-13 00:00 |
01:44:02.04 |
+16:58:31.1 |
HIP 7930 |
30.28 |
| 2026-04-13 12:00 |
01:44:48.38 |
+17:03:39.8 |
HIP 8271 |
33.11 |
| 2026-04-14 00:00 |
01:45:34.75 |
+17:08:48.1 |
HIP 8271 |
21.53 |
| 2026-04-14 12:00 |
01:46:21.15 |
+17:13:56.0 |
HIP 8271 |
11.34 |
| 2026-04-15 00:00 |
01:47:07.56 |
+17:19:03.4 |
HIP 8309 |
1.86 |
| 2026-04-15 12:00 |
01:47:53.99 |
+17:24:10.4 |
HIP 8309 |
12.56 |
| 2026-04-16 00:00 |
01:48:40.44 |
+17:29:17.0 |
HIP 8489 |
20.88 |