| 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) |
| 2026-03-26 00:00 |
12:37:18.65 |
-17:36:35.6 |
HIP 61460 |
36.34 |
| 2026-03-26 12:00 |
12:37:16.80 |
-17:36:24.0 |
HIP 61460 |
35.91 |
| 2026-03-27 00:00 |
12:37:14.95 |
-17:36:12.4 |
HIP 61460 |
35.48 |
| 2026-03-27 12:00 |
12:37:13.09 |
-17:36:00.6 |
HIP 61460 |
35.04 |
| 2026-03-28 00:00 |
12:37:11.24 |
-17:35:48.8 |
HIP 61460 |
34.61 |
| 2026-03-28 12:00 |
12:37:09.39 |
-17:35:36.9 |
HIP 61460 |
34.18 |
| 2026-03-29 00:00 |
12:37:07.53 |
-17:35:25.0 |
HIP 61460 |
33.75 |
| 2026-03-29 12:00 |
12:37:05.68 |
-17:35:13.0 |
HIP 61460 |
33.32 |
| 2026-03-30 00:00 |
12:37:03.82 |
-17:35:00.9 |
HIP 61460 |
32.89 |
| 2026-03-30 12:00 |
12:37:01.96 |
-17:34:48.8 |
HIP 61460 |
32.46 |
| 2026-03-31 00:00 |
12:37:00.11 |
-17:34:36.6 |
HIP 61460 |
32.03 |
| 2026-03-31 12:00 |
12:36:58.25 |
-17:34:24.4 |
HIP 61460 |
31.60 |
| 2026-04-01 00:00 |
12:36:56.40 |
-17:34:12.1 |
HIP 61460 |
31.17 |
| 2026-04-01 12:00 |
12:36:54.54 |
-17:33:59.7 |
HIP 61460 |
30.74 |
| 2026-04-02 00:00 |
12:36:52.69 |
-17:33:47.3 |
HIP 61460 |
30.32 |
| 2026-04-02 12:00 |
12:36:50.84 |
-17:33:34.8 |
HIP 61460 |
29.89 |
| 2026-04-03 00:00 |
12:36:48.98 |
-17:33:22.3 |
HIP 61460 |
29.47 |
| 2026-04-03 12:00 |
12:36:47.13 |
-17:33:09.7 |
HIP 61460 |
29.05 |
| 2026-04-04 00:00 |
12:36:45.28 |
-17:32:57.0 |
HIP 61460 |
28.63 |
| 2026-04-04 12:00 |
12:36:43.43 |
-17:32:44.3 |
HIP 61460 |
28.21 |
| 2026-04-05 00:00 |
12:36:41.58 |
-17:32:31.5 |
HIP 61460 |
27.80 |
| 2026-04-05 12:00 |
12:36:39.73 |
-17:32:18.7 |
HIP 61460 |
27.38 |
| 2026-04-06 00:00 |
12:36:37.89 |
-17:32:05.9 |
HIP 61460 |
26.97 |
| 2026-04-06 12:00 |
12:36:36.05 |
-17:31:53.0 |
HIP 61460 |
26.56 |
| 2026-04-07 00:00 |
12:36:34.20 |
-17:31:40.0 |
HIP 61460 |
26.15 |
| 2026-04-07 12:00 |
12:36:32.36 |
-17:31:27.0 |
HIP 61460 |
25.75 |
| 2026-04-08 00:00 |
12:36:30.53 |
-17:31:13.9 |
HIP 61460 |
25.34 |
| 2026-04-08 12:00 |
12:36:28.69 |
-17:31:00.8 |
HIP 61460 |
24.94 |
| 2026-04-09 00:00 |
12:36:26.86 |
-17:30:47.7 |
HIP 61460 |
24.54 |
| 2026-04-09 12:00 |
12:36:25.03 |
-17:30:34.5 |
HIP 61460 |
24.15 |
| 2026-04-10 00:00 |
12:36:23.20 |
-17:30:21.3 |
HIP 61460 |
23.76 |
| 2026-04-10 12:00 |
12:36:21.38 |
-17:30:08.0 |
HIP 61460 |
23.37 |
| 2026-04-11 00:00 |
12:36:19.56 |
-17:29:54.7 |
HIP 61460 |
22.98 |
| 2026-04-11 12:00 |
12:36:17.74 |
-17:29:41.3 |
HIP 61460 |
22.60 |
| 2026-04-12 00:00 |
12:36:15.93 |
-17:29:27.9 |
HIP 61460 |
22.23 |
| 2026-04-12 12:00 |
12:36:14.11 |
-17:29:14.5 |
HIP 61460 |
21.85 |
| 2026-04-13 00:00 |
12:36:12.31 |
-17:29:01.0 |
HIP 61460 |
21.48 |
| 2026-04-13 12:00 |
12:36:10.50 |
-17:28:47.5 |
HIP 61460 |
21.12 |
| 2026-04-14 00:00 |
12:36:08.70 |
-17:28:33.9 |
HIP 61460 |
20.76 |
| 2026-04-14 12:00 |
12:36:06.91 |
-17:28:20.3 |
HIP 61460 |
20.40 |
| 2026-04-15 00:00 |
12:36:05.12 |
-17:28:06.7 |
HIP 61460 |
20.06 |
| 2026-04-15 12:00 |
12:36:03.33 |
-17:27:53.0 |
HIP 61460 |
19.71 |
| 2026-04-16 00:00 |
12:36:01.55 |
-17:27:39.4 |
HIP 61460 |
19.37 |