C/1988 J1 (Shoemaker-Holt)
| Parameter |
Value |
| Designation |
C/1988 J1 (Shoemaker-Holt) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1988-02-14T05:17:56.938560Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:36Z |
| Obs used |
84 |
| NEO |
- |
| M1 |
5.900 |
| K1 |
21.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1988-06-23.0000000 |
| e |
0.99780777 |
| q (au) |
1.174487 |
| a (au) |
535.749413 |
| i (deg) |
62.807050 |
| Ω (om, deg) |
288.765006 |
| ω (w, deg) |
326.515452 |
| M (ma, deg) |
0.010315 |
Magnitude
Scatter + Global Linear
$$
M_a = (6.971 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
6.971 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
0.987 |
| 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) |
| 2026-02-03 00:00 |
04:49:27.67 |
+65:14:51.3 |
HIP 22468 |
4.26 |
| 2026-02-03 12:00 |
04:49:25.43 |
+65:14:32.1 |
HIP 22468 |
4.58 |
| 2026-02-04 00:00 |
04:49:23.22 |
+65:14:12.9 |
HIP 22468 |
4.91 |
| 2026-02-04 12:00 |
04:49:21.04 |
+65:13:53.6 |
HIP 22468 |
5.25 |
| 2026-02-05 00:00 |
04:49:18.91 |
+65:13:34.3 |
HIP 22468 |
5.59 |
| 2026-02-05 12:00 |
04:49:16.81 |
+65:13:14.9 |
HIP 22468 |
5.93 |
| 2026-02-06 00:00 |
04:49:14.75 |
+65:12:55.5 |
HIP 22468 |
6.28 |
| 2026-02-06 12:00 |
04:49:12.72 |
+65:12:36.0 |
HIP 22468 |
6.63 |
| 2026-02-07 00:00 |
04:49:10.74 |
+65:12:16.4 |
HIP 22468 |
6.98 |
| 2026-02-07 12:00 |
04:49:08.79 |
+65:11:56.8 |
HIP 22468 |
7.33 |
| 2026-02-08 00:00 |
04:49:06.88 |
+65:11:37.1 |
HIP 22468 |
7.68 |
| 2026-02-08 12:00 |
04:49:05.00 |
+65:11:17.4 |
HIP 22468 |
8.03 |
| 2026-02-09 00:00 |
04:49:03.17 |
+65:10:57.6 |
HIP 22468 |
8.38 |
| 2026-02-09 12:00 |
04:49:01.37 |
+65:10:37.8 |
HIP 22468 |
8.73 |
| 2026-02-10 00:00 |
04:48:59.61 |
+65:10:18.0 |
HIP 22468 |
9.09 |
| 2026-02-10 12:00 |
04:48:57.89 |
+65:09:58.1 |
HIP 22468 |
9.44 |
| 2026-02-11 00:00 |
04:48:56.21 |
+65:09:38.1 |
HIP 22468 |
9.79 |
| 2026-02-11 12:00 |
04:48:54.57 |
+65:09:18.1 |
HIP 22468 |
10.14 |
| 2026-02-12 00:00 |
04:48:52.96 |
+65:08:58.1 |
HIP 22468 |
10.49 |
| 2026-02-12 12:00 |
04:48:51.39 |
+65:08:38.0 |
HIP 22468 |
10.83 |
| 2026-02-13 00:00 |
04:48:49.87 |
+65:08:18.0 |
HIP 22468 |
11.18 |
| 2026-02-13 12:00 |
04:48:48.38 |
+65:07:57.8 |
HIP 22468 |
11.53 |
| 2026-02-14 00:00 |
04:48:46.93 |
+65:07:37.7 |
HIP 22468 |
11.87 |
| 2026-02-14 12:00 |
04:48:45.52 |
+65:07:17.5 |
HIP 22468 |
12.22 |
| 2026-02-15 00:00 |
04:48:44.15 |
+65:06:57.2 |
HIP 22468 |
12.56 |
| 2026-02-15 12:00 |
04:48:42.82 |
+65:06:37.0 |
HIP 22468 |
12.90 |
| 2026-02-16 00:00 |
04:48:41.53 |
+65:06:16.7 |
HIP 22468 |
13.24 |
| 2026-02-16 12:00 |
04:48:40.28 |
+65:05:56.4 |
HIP 22468 |
13.58 |
| 2026-02-17 00:00 |
04:48:39.06 |
+65:05:36.1 |
HIP 22468 |
13.92 |
| 2026-02-17 12:00 |
04:48:37.89 |
+65:05:15.8 |
HIP 22468 |
14.26 |
| 2026-02-18 00:00 |
04:48:36.76 |
+65:04:55.4 |
HIP 22468 |
14.59 |
| 2026-02-18 12:00 |
04:48:35.66 |
+65:04:35.0 |
HIP 22468 |
14.93 |
| 2026-02-19 00:00 |
04:48:34.61 |
+65:04:14.6 |
HIP 22468 |
15.26 |
| 2026-02-19 12:00 |
04:48:33.60 |
+65:03:54.2 |
HIP 22468 |
15.59 |
| 2026-02-20 00:00 |
04:48:32.62 |
+65:03:33.8 |
HIP 22468 |
15.92 |
| 2026-02-20 12:00 |
04:48:31.69 |
+65:03:13.4 |
HIP 22468 |
16.25 |
| 2026-02-21 00:00 |
04:48:30.79 |
+65:02:53.0 |
HIP 22468 |
16.58 |
| 2026-02-21 12:00 |
04:48:29.94 |
+65:02:32.5 |
HIP 22468 |
16.91 |
| 2026-02-22 00:00 |
04:48:29.13 |
+65:02:12.1 |
HIP 22468 |
17.23 |
| 2026-02-22 12:00 |
04:48:28.35 |
+65:01:51.6 |
HIP 22468 |
17.55 |
| 2026-02-23 00:00 |
04:48:27.62 |
+65:01:31.2 |
HIP 22468 |
17.88 |
| 2026-02-23 12:00 |
04:48:26.92 |
+65:01:10.7 |
HIP 22190 |
18.05 |
| 2026-02-24 00:00 |
04:48:26.27 |
+65:00:50.3 |
HIP 22190 |
17.77 |