| 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) |
| 2026-07-29 00:00 |
12:33:55.05 |
-16:52:04.1 |
HIP 61325 |
12.63 |
| 2026-07-29 12:00 |
12:33:55.93 |
-16:52:02.3 |
HIP 61325 |
12.66 |
| 2026-07-30 00:00 |
12:33:56.83 |
-16:52:00.6 |
HIP 61325 |
12.69 |
| 2026-07-30 12:00 |
12:33:57.73 |
-16:51:59.1 |
HIP 61325 |
12.73 |
| 2026-07-31 00:00 |
12:33:58.65 |
-16:51:57.6 |
HIP 61325 |
12.76 |
| 2026-07-31 12:00 |
12:33:59.59 |
-16:51:56.2 |
HIP 61325 |
12.80 |
| 2026-08-01 00:00 |
12:34:00.54 |
-16:51:55.0 |
HIP 61325 |
12.84 |
| 2026-08-01 12:00 |
12:34:01.50 |
-16:51:53.8 |
HIP 61325 |
12.89 |
| 2026-08-02 00:00 |
12:34:02.47 |
-16:51:52.8 |
HIP 61325 |
12.94 |
| 2026-08-02 12:00 |
12:34:03.46 |
-16:51:51.8 |
HIP 61325 |
12.99 |
| 2026-08-03 00:00 |
12:34:04.45 |
-16:51:51.0 |
HIP 61325 |
13.04 |
| 2026-08-03 12:00 |
12:34:05.47 |
-16:51:50.3 |
HIP 61325 |
13.09 |
| 2026-08-04 00:00 |
12:34:06.49 |
-16:51:49.7 |
HIP 61325 |
13.15 |
| 2026-08-04 12:00 |
12:34:07.53 |
-16:51:49.2 |
HIP 61325 |
13.21 |
| 2026-08-05 00:00 |
12:34:08.58 |
-16:51:48.8 |
HIP 61325 |
13.28 |
| 2026-08-05 12:00 |
12:34:09.64 |
-16:51:48.5 |
HIP 61325 |
13.35 |
| 2026-08-06 00:00 |
12:34:10.72 |
-16:51:48.3 |
HIP 61325 |
13.42 |
| 2026-08-06 12:00 |
12:34:11.81 |
-16:51:48.2 |
HIP 61325 |
13.50 |
| 2026-08-07 00:00 |
12:34:12.91 |
-16:51:48.2 |
HIP 61325 |
13.58 |
| 2026-08-07 12:00 |
12:34:14.02 |
-16:51:48.4 |
HIP 61325 |
13.66 |
| 2026-08-08 00:00 |
12:34:15.15 |
-16:51:48.6 |
HIP 61325 |
13.75 |
| 2026-08-08 12:00 |
12:34:16.29 |
-16:51:48.9 |
HIP 61325 |
13.84 |
| 2026-08-09 00:00 |
12:34:17.43 |
-16:51:49.4 |
HIP 61325 |
13.94 |
| 2026-08-09 12:00 |
12:34:18.60 |
-16:51:50.0 |
HIP 61325 |
14.04 |
| 2026-08-10 00:00 |
12:34:19.77 |
-16:51:50.6 |
HIP 61325 |
14.14 |
| 2026-08-10 12:00 |
12:34:20.96 |
-16:51:51.4 |
HIP 61325 |
14.25 |
| 2026-08-11 00:00 |
12:34:22.16 |
-16:51:52.3 |
HIP 61325 |
14.37 |
| 2026-08-11 12:00 |
12:34:23.37 |
-16:51:53.3 |
HIP 61325 |
14.48 |
| 2026-08-12 00:00 |
12:34:24.59 |
-16:51:54.4 |
HIP 61325 |
14.61 |
| 2026-08-12 12:00 |
12:34:25.82 |
-16:51:55.6 |
HIP 61325 |
14.73 |
| 2026-08-13 00:00 |
12:34:27.06 |
-16:51:56.9 |
HIP 61325 |
14.87 |
| 2026-08-13 12:00 |
12:34:28.32 |
-16:51:58.3 |
HIP 61325 |
15.00 |
| 2026-08-14 00:00 |
12:34:29.59 |
-16:51:59.8 |
HIP 61325 |
15.14 |
| 2026-08-14 12:00 |
12:34:30.87 |
-16:52:01.4 |
HIP 61325 |
15.29 |
| 2026-08-15 00:00 |
12:34:32.16 |
-16:52:03.1 |
HIP 61325 |
15.44 |
| 2026-08-15 12:00 |
12:34:33.46 |
-16:52:05.0 |
HIP 61325 |
15.60 |
| 2026-08-16 00:00 |
12:34:34.77 |
-16:52:06.9 |
HIP 61325 |
15.76 |
| 2026-08-16 12:00 |
12:34:36.09 |
-16:52:08.9 |
HIP 61325 |
15.92 |
| 2026-08-17 00:00 |
12:34:37.43 |
-16:52:11.1 |
HIP 61463 |
15.86 |
| 2026-08-17 12:00 |
12:34:38.77 |
-16:52:13.3 |
HIP 61463 |
15.55 |
| 2026-08-18 00:00 |
12:34:40.13 |
-16:52:15.7 |
HIP 61463 |
15.24 |
| 2026-08-18 12:00 |
12:34:41.49 |
-16:52:18.1 |
HIP 61463 |
14.92 |
| 2026-08-19 00:00 |
12:34:42.87 |
-16:52:20.6 |
HIP 61463 |
14.61 |