| Parameter |
Value |
| Designation |
P/2017 W3 (Gibbs) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2018-02-25T02:11:14.487360Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:38Z |
| Obs used |
142 |
| NEO |
- |
| M1 |
10.500 |
| K1 |
10.000 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2018-02-01.0000000 |
| e |
0.50387336 |
| q (au) |
3.837297 |
| a (au) |
7.734510 |
| i (deg) |
18.316724 |
| Ω (om, deg) |
210.753463 |
| ω (w, deg) |
326.464054 |
| M (ma, deg) |
358.896145 |
Magnitude
Scatter + Global Linear
$$
M_a = (14.132 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
14.132 |
| n |
2.000 |
| gf |
0.993 |
| gb |
-0.500 |
| k |
0.802 |
| δ90 |
2.032 |
| 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 |
22:48:19.04 |
+08:04:30.4 |
HIP 112630 |
14.79 |
| 2026-07-29 12:00 |
22:48:12.87 |
+08:04:11.7 |
HIP 112630 |
15.12 |
| 2026-07-30 00:00 |
22:48:06.65 |
+08:03:52.3 |
HIP 112630 |
15.61 |
| 2026-07-30 12:00 |
22:48:00.37 |
+08:03:32.2 |
HIP 112630 |
16.23 |
| 2026-07-31 00:00 |
22:47:54.04 |
+08:03:11.6 |
HIP 112630 |
16.99 |
| 2026-07-31 12:00 |
22:47:47.66 |
+08:02:50.4 |
HIP 112630 |
17.85 |
| 2026-08-01 00:00 |
22:47:41.23 |
+08:02:28.5 |
HIP 112630 |
18.82 |
| 2026-08-01 12:00 |
22:47:34.74 |
+08:02:06.0 |
HIP 112518 |
19.63 |
| 2026-08-02 00:00 |
22:47:28.20 |
+08:01:42.9 |
HIP 112518 |
19.19 |
| 2026-08-02 12:00 |
22:47:21.61 |
+08:01:19.2 |
HIP 112518 |
18.88 |
| 2026-08-03 00:00 |
22:47:14.97 |
+08:00:54.9 |
HIP 112518 |
18.71 |
| 2026-08-03 12:00 |
22:47:08.29 |
+08:00:29.9 |
HIP 112518 |
18.69 |
| 2026-08-04 00:00 |
22:47:01.55 |
+08:00:04.4 |
HIP 112518 |
18.81 |
| 2026-08-04 12:00 |
22:46:54.77 |
+07:59:38.2 |
HIP 112518 |
19.09 |
| 2026-08-05 00:00 |
22:46:47.94 |
+07:59:11.4 |
HIP 112518 |
19.51 |
| 2026-08-05 12:00 |
22:46:41.06 |
+07:58:44.1 |
HIP 112518 |
20.08 |
| 2026-08-06 00:00 |
22:46:34.14 |
+07:58:16.1 |
HIP 112518 |
20.78 |
| 2026-08-06 12:00 |
22:46:27.17 |
+07:57:47.5 |
HIP 112518 |
21.61 |
| 2026-08-07 00:00 |
22:46:20.16 |
+07:57:18.3 |
HIP 112433 |
22.43 |
| 2026-08-07 12:00 |
22:46:13.10 |
+07:56:48.5 |
HIP 112433 |
22.17 |
| 2026-08-08 00:00 |
22:46:06.00 |
+07:56:18.1 |
HIP 112433 |
22.05 |
| 2026-08-08 12:00 |
22:45:58.86 |
+07:55:47.1 |
HIP 112433 |
22.07 |
| 2026-08-09 00:00 |
22:45:51.68 |
+07:55:15.6 |
HIP 112433 |
22.25 |
| 2026-08-09 12:00 |
22:45:44.45 |
+07:54:43.4 |
HIP 112433 |
22.57 |
| 2026-08-10 00:00 |
22:45:37.19 |
+07:54:10.6 |
HIP 112433 |
23.04 |
| 2026-08-10 12:00 |
22:45:29.89 |
+07:53:37.3 |
HIP 112433 |
23.65 |
| 2026-08-11 00:00 |
22:45:22.55 |
+07:53:03.3 |
HIP 112433 |
24.38 |
| 2026-08-11 12:00 |
22:45:15.17 |
+07:52:28.8 |
HIP 112433 |
25.24 |
| 2026-08-12 00:00 |
22:45:07.76 |
+07:51:53.7 |
HIP 112433 |
26.22 |
| 2026-08-12 12:00 |
22:45:00.30 |
+07:51:18.0 |
HIP 112433 |
27.29 |
| 2026-08-13 00:00 |
22:44:52.82 |
+07:50:41.8 |
HIP 112433 |
28.46 |
| 2026-08-13 12:00 |
22:44:45.30 |
+07:50:04.9 |
HIP 112147 |
27.17 |
| 2026-08-14 00:00 |
22:44:37.75 |
+07:49:27.5 |
HIP 112147 |
25.24 |
| 2026-08-14 12:00 |
22:44:30.16 |
+07:48:49.6 |
HIP 112147 |
23.30 |
| 2026-08-15 00:00 |
22:44:22.55 |
+07:48:11.1 |
HIP 112147 |
21.36 |
| 2026-08-15 12:00 |
22:44:14.90 |
+07:47:32.0 |
HIP 112147 |
19.43 |
| 2026-08-16 00:00 |
22:44:07.23 |
+07:46:52.4 |
HIP 112147 |
17.50 |
| 2026-08-16 12:00 |
22:43:59.52 |
+07:46:12.2 |
HIP 112147 |
15.59 |
| 2026-08-17 00:00 |
22:43:51.79 |
+07:45:31.5 |
HIP 112147 |
13.71 |
| 2026-08-17 12:00 |
22:43:44.03 |
+07:44:50.2 |
HIP 112147 |
11.87 |
| 2026-08-18 00:00 |
22:43:36.25 |
+07:44:08.4 |
HIP 112147 |
10.10 |
| 2026-08-18 12:00 |
22:43:28.44 |
+07:43:26.1 |
HIP 112147 |
8.45 |
| 2026-08-19 00:00 |
22:43:20.60 |
+07:42:43.3 |
HIP 112147 |
7.03 |