C/1987 W3 (Jensen-Shoemaker)
| Parameter |
Value |
| Designation |
C/1987 W3 (Jensen-Shoemaker) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1988-01-18T16:22:02.138880Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:36Z |
| Obs used |
33 |
| NEO |
- |
| M1 |
9.200 |
| K1 |
10.000 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
1988-07-04.0000000 |
| e |
1.00360306 |
| q (au) |
3.332745 |
| a (au) |
-924.976804 |
| i (deg) |
76.700407 |
| Ω (om, deg) |
198.337713 |
| ω (w, deg) |
194.713159 |
| M (ma, deg) |
0.005862 |
Magnitude
Scatter + Global Linear
$$
M_a = (6.127 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
6.127 |
| 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) |
| 2026-02-03 00:00 |
12:39:54.63 |
-17:48:11.5 |
HIP 61804 |
7.25 |
| 2026-02-03 12:00 |
12:39:53.63 |
-17:48:10.2 |
HIP 61804 |
7.28 |
| 2026-02-04 00:00 |
12:39:52.63 |
-17:48:08.8 |
HIP 61804 |
7.31 |
| 2026-02-04 12:00 |
12:39:51.61 |
-17:48:07.2 |
HIP 61804 |
7.35 |
| 2026-02-05 00:00 |
12:39:50.57 |
-17:48:05.5 |
HIP 61804 |
7.39 |
| 2026-02-05 12:00 |
12:39:49.52 |
-17:48:03.8 |
HIP 61804 |
7.44 |
| 2026-02-06 00:00 |
12:39:48.46 |
-17:48:01.8 |
HIP 61804 |
7.50 |
| 2026-02-06 12:00 |
12:39:47.38 |
-17:47:59.8 |
HIP 61804 |
7.57 |
| 2026-02-07 00:00 |
12:39:46.29 |
-17:47:57.7 |
HIP 61804 |
7.65 |
| 2026-02-07 12:00 |
12:39:45.19 |
-17:47:55.4 |
HIP 61804 |
7.73 |
| 2026-02-08 00:00 |
12:39:44.07 |
-17:47:53.1 |
HIP 61804 |
7.82 |
| 2026-02-08 12:00 |
12:39:42.94 |
-17:47:50.6 |
HIP 61804 |
7.92 |
| 2026-02-09 00:00 |
12:39:41.80 |
-17:47:48.0 |
HIP 61804 |
8.03 |
| 2026-02-09 12:00 |
12:39:40.64 |
-17:47:45.3 |
HIP 61804 |
8.14 |
| 2026-02-10 00:00 |
12:39:39.47 |
-17:47:42.4 |
HIP 61804 |
8.27 |
| 2026-02-10 12:00 |
12:39:38.28 |
-17:47:39.5 |
HIP 61804 |
8.40 |
| 2026-02-11 00:00 |
12:39:37.09 |
-17:47:36.4 |
HIP 61804 |
8.54 |
| 2026-02-11 12:00 |
12:39:35.88 |
-17:47:33.2 |
HIP 61804 |
8.69 |
| 2026-02-12 00:00 |
12:39:34.65 |
-17:47:29.9 |
HIP 61804 |
8.84 |
| 2026-02-12 12:00 |
12:39:33.42 |
-17:47:26.5 |
HIP 61804 |
9.01 |
| 2026-02-13 00:00 |
12:39:32.17 |
-17:47:23.0 |
HIP 61804 |
9.18 |
| 2026-02-13 12:00 |
12:39:30.91 |
-17:47:19.3 |
HIP 61804 |
9.36 |
| 2026-02-14 00:00 |
12:39:29.64 |
-17:47:15.6 |
HIP 61804 |
9.54 |
| 2026-02-14 12:00 |
12:39:28.35 |
-17:47:11.7 |
HIP 61804 |
9.74 |
| 2026-02-15 00:00 |
12:39:27.05 |
-17:47:07.7 |
HIP 61804 |
9.94 |
| 2026-02-15 12:00 |
12:39:25.74 |
-17:47:03.6 |
HIP 61804 |
10.15 |
| 2026-02-16 00:00 |
12:39:24.42 |
-17:46:59.3 |
HIP 61804 |
10.36 |
| 2026-02-16 12:00 |
12:39:23.09 |
-17:46:55.0 |
HIP 61804 |
10.58 |
| 2026-02-17 00:00 |
12:39:21.74 |
-17:46:50.6 |
HIP 61804 |
10.81 |
| 2026-02-17 12:00 |
12:39:20.39 |
-17:46:46.0 |
HIP 61804 |
11.05 |
| 2026-02-18 00:00 |
12:39:19.02 |
-17:46:41.3 |
HIP 61804 |
11.29 |
| 2026-02-18 12:00 |
12:39:17.64 |
-17:46:36.5 |
HIP 61804 |
11.54 |
| 2026-02-19 00:00 |
12:39:16.25 |
-17:46:31.6 |
HIP 61804 |
11.79 |
| 2026-02-19 12:00 |
12:39:14.84 |
-17:46:26.6 |
HIP 61804 |
12.05 |
| 2026-02-20 00:00 |
12:39:13.43 |
-17:46:21.4 |
HIP 61804 |
12.31 |
| 2026-02-20 12:00 |
12:39:12.01 |
-17:46:16.2 |
HIP 61804 |
12.58 |
| 2026-02-21 00:00 |
12:39:10.57 |
-17:46:10.8 |
HIP 61804 |
12.86 |
| 2026-02-21 12:00 |
12:39:09.13 |
-17:46:05.4 |
HIP 61804 |
13.14 |
| 2026-02-22 00:00 |
12:39:07.67 |
-17:45:59.8 |
HIP 61804 |
13.43 |
| 2026-02-22 12:00 |
12:39:06.20 |
-17:45:54.1 |
HIP 61804 |
13.72 |
| 2026-02-23 00:00 |
12:39:04.73 |
-17:45:48.3 |
HIP 61804 |
14.02 |
| 2026-02-23 12:00 |
12:39:03.24 |
-17:45:42.4 |
HIP 61804 |
14.32 |
| 2026-02-24 00:00 |
12:39:01.74 |
-17:45:36.4 |
HIP 61804 |
14.62 |