| 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) |
| 2026-06-01 00:00 |
12:33:53.55 |
-17:06:40.7 |
HIP 61325 |
2.02 |
| 2026-06-01 12:00 |
12:33:52.70 |
-17:06:28.4 |
HIP 61325 |
1.87 |
| 2026-06-02 00:00 |
12:33:51.86 |
-17:06:16.2 |
HIP 61325 |
1.75 |
| 2026-06-02 12:00 |
12:33:51.03 |
-17:06:04.1 |
HIP 61325 |
1.68 |
| 2026-06-03 00:00 |
12:33:50.22 |
-17:05:52.0 |
HIP 61325 |
1.65 |
| 2026-06-03 12:00 |
12:33:49.43 |
-17:05:40.0 |
HIP 61325 |
1.66 |
| 2026-06-04 00:00 |
12:33:48.65 |
-17:05:28.0 |
HIP 61325 |
1.72 |
| 2026-06-04 12:00 |
12:33:47.88 |
-17:05:16.1 |
HIP 61325 |
1.81 |
| 2026-06-05 00:00 |
12:33:47.13 |
-17:05:04.2 |
HIP 61325 |
1.93 |
| 2026-06-05 12:00 |
12:33:46.39 |
-17:04:52.4 |
HIP 61325 |
2.08 |
| 2026-06-06 00:00 |
12:33:45.67 |
-17:04:40.7 |
HIP 61325 |
2.25 |
| 2026-06-06 12:00 |
12:33:44.96 |
-17:04:29.1 |
HIP 61325 |
2.42 |
| 2026-06-07 00:00 |
12:33:44.26 |
-17:04:17.5 |
HIP 61325 |
2.61 |
| 2026-06-07 12:00 |
12:33:43.58 |
-17:04:05.9 |
HIP 61325 |
2.81 |
| 2026-06-08 00:00 |
12:33:42.92 |
-17:03:54.5 |
HIP 61325 |
3.01 |
| 2026-06-08 12:00 |
12:33:42.27 |
-17:03:43.1 |
HIP 61325 |
3.21 |
| 2026-06-09 00:00 |
12:33:41.63 |
-17:03:31.8 |
HIP 61325 |
3.42 |
| 2026-06-09 12:00 |
12:33:41.01 |
-17:03:20.5 |
HIP 61325 |
3.62 |
| 2026-06-10 00:00 |
12:33:40.41 |
-17:03:09.4 |
HIP 61325 |
3.83 |
| 2026-06-10 12:00 |
12:33:39.81 |
-17:02:58.2 |
HIP 61325 |
4.03 |
| 2026-06-11 00:00 |
12:33:39.24 |
-17:02:47.2 |
HIP 61325 |
4.24 |
| 2026-06-11 12:00 |
12:33:38.68 |
-17:02:36.2 |
HIP 61325 |
4.44 |
| 2026-06-12 00:00 |
12:33:38.13 |
-17:02:25.3 |
HIP 61325 |
4.64 |
| 2026-06-12 12:00 |
12:33:37.60 |
-17:02:14.5 |
HIP 61325 |
4.84 |
| 2026-06-13 00:00 |
12:33:37.08 |
-17:02:03.8 |
HIP 61325 |
5.04 |
| 2026-06-13 12:00 |
12:33:36.58 |
-17:01:53.1 |
HIP 61325 |
5.24 |
| 2026-06-14 00:00 |
12:33:36.10 |
-17:01:42.5 |
HIP 61325 |
5.43 |
| 2026-06-14 12:00 |
12:33:35.63 |
-17:01:32.0 |
HIP 61325 |
5.62 |
| 2026-06-15 00:00 |
12:33:35.17 |
-17:01:21.6 |
HIP 61325 |
5.81 |
| 2026-06-15 12:00 |
12:33:34.73 |
-17:01:11.2 |
HIP 61325 |
5.99 |
| 2026-06-16 00:00 |
12:33:34.31 |
-17:01:00.9 |
HIP 61325 |
6.18 |
| 2026-06-16 12:00 |
12:33:33.90 |
-17:00:50.7 |
HIP 61325 |
6.36 |
| 2026-06-17 00:00 |
12:33:33.50 |
-17:00:40.6 |
HIP 61325 |
6.53 |
| 2026-06-17 12:00 |
12:33:33.12 |
-17:00:30.6 |
HIP 61325 |
6.71 |
| 2026-06-18 00:00 |
12:33:32.76 |
-17:00:20.6 |
HIP 61325 |
6.88 |
| 2026-06-18 12:00 |
12:33:32.41 |
-17:00:10.7 |
HIP 61325 |
7.05 |
| 2026-06-19 00:00 |
12:33:32.08 |
-17:00:00.9 |
HIP 61325 |
7.22 |
| 2026-06-19 12:00 |
12:33:31.76 |
-16:59:51.2 |
HIP 61325 |
7.38 |
| 2026-06-20 00:00 |
12:33:31.46 |
-16:59:41.6 |
HIP 61325 |
7.54 |
| 2026-06-20 12:00 |
12:33:31.18 |
-16:59:32.1 |
HIP 61325 |
7.70 |
| 2026-06-21 00:00 |
12:33:30.91 |
-16:59:22.6 |
HIP 61325 |
7.85 |
| 2026-06-21 12:00 |
12:33:30.65 |
-16:59:13.2 |
HIP 61325 |
8.00 |
| 2026-06-22 00:00 |
12:33:30.41 |
-16:59:04.0 |
HIP 61325 |
8.15 |