| 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) |
| 2026-09-20 00:00 |
22:34:49.85 |
+06:42:17.1 |
HIP 111388 |
12.62 |
| 2026-09-20 12:00 |
22:34:42.39 |
+06:41:10.7 |
HIP 111388 |
10.81 |
| 2026-09-21 00:00 |
22:34:34.95 |
+06:40:04.1 |
HIP 111388 |
9.17 |
| 2026-09-21 12:00 |
22:34:27.56 |
+06:38:57.3 |
HIP 111388 |
7.79 |
| 2026-09-22 00:00 |
22:34:20.20 |
+06:37:50.4 |
HIP 111388 |
6.83 |
| 2026-09-22 12:00 |
22:34:12.88 |
+06:36:43.4 |
HIP 111388 |
6.46 |
| 2026-09-23 00:00 |
22:34:05.60 |
+06:35:36.2 |
HIP 111388 |
6.79 |
| 2026-09-23 12:00 |
22:33:58.36 |
+06:34:28.9 |
HIP 111388 |
7.71 |
| 2026-09-24 00:00 |
22:33:51.16 |
+06:33:21.5 |
HIP 111388 |
9.05 |
| 2026-09-24 12:00 |
22:33:44.00 |
+06:32:13.9 |
HIP 111388 |
10.64 |
| 2026-09-25 00:00 |
22:33:36.88 |
+06:31:06.3 |
HIP 111388 |
12.38 |
| 2026-09-25 12:00 |
22:33:29.81 |
+06:29:58.6 |
HIP 111388 |
14.21 |
| 2026-09-26 00:00 |
22:33:22.78 |
+06:28:50.8 |
HIP 111388 |
16.10 |
| 2026-09-26 12:00 |
22:33:15.80 |
+06:27:42.9 |
HIP 111388 |
18.02 |
| 2026-09-27 00:00 |
22:33:08.86 |
+06:26:34.9 |
HIP 111388 |
19.97 |
| 2026-09-27 12:00 |
22:33:01.96 |
+06:25:26.8 |
HIP 111388 |
21.94 |
| 2026-09-28 00:00 |
22:32:55.11 |
+06:24:18.7 |
HIP 111388 |
23.91 |
| 2026-09-28 12:00 |
22:32:48.31 |
+06:23:10.5 |
HIP 111388 |
25.89 |
| 2026-09-29 00:00 |
22:32:41.56 |
+06:22:02.3 |
HIP 111388 |
27.86 |
| 2026-09-29 12:00 |
22:32:34.86 |
+06:20:54.0 |
HIP 111131 |
28.25 |
| 2026-09-30 00:00 |
22:32:28.21 |
+06:19:45.7 |
HIP 111131 |
27.10 |
| 2026-09-30 12:00 |
22:32:21.60 |
+06:18:37.3 |
HIP 111131 |
26.07 |
| 2026-10-01 00:00 |
22:32:15.05 |
+06:17:28.9 |
HIP 111131 |
25.17 |
| 2026-10-01 12:00 |
22:32:08.55 |
+06:16:20.5 |
HIP 111131 |
24.40 |
| 2026-10-02 00:00 |
22:32:02.10 |
+06:15:12.1 |
HIP 111131 |
23.79 |
| 2026-10-02 12:00 |
22:31:55.71 |
+06:14:03.7 |
HIP 111131 |
23.33 |
| 2026-10-03 00:00 |
22:31:49.37 |
+06:12:55.3 |
HIP 111131 |
23.04 |
| 2026-10-03 12:00 |
22:31:43.08 |
+06:11:46.9 |
HIP 111131 |
22.92 |
| 2026-10-04 00:00 |
22:31:36.85 |
+06:10:38.5 |
HIP 111131 |
22.97 |
| 2026-10-04 12:00 |
22:31:30.68 |
+06:09:30.1 |
HIP 111131 |
23.19 |
| 2026-10-05 00:00 |
22:31:24.56 |
+06:08:21.7 |
HIP 111131 |
23.57 |
| 2026-10-05 12:00 |
22:31:18.50 |
+06:07:13.4 |
HIP 111131 |
24.09 |
| 2026-10-06 00:00 |
22:31:12.50 |
+06:06:05.1 |
HIP 111131 |
24.75 |
| 2026-10-06 12:00 |
22:31:06.55 |
+06:04:56.9 |
HIP 111131 |
25.53 |
| 2026-10-07 00:00 |
22:31:00.67 |
+06:03:48.7 |
HIP 111131 |
26.43 |
| 2026-10-07 12:00 |
22:30:54.85 |
+06:02:40.6 |
HIP 111131 |
27.41 |
| 2026-10-08 00:00 |
22:30:49.09 |
+06:01:32.6 |
HIP 111034 |
27.82 |
| 2026-10-08 12:00 |
22:30:43.39 |
+06:00:24.6 |
HIP 111034 |
26.05 |
| 2026-10-09 00:00 |
22:30:37.75 |
+05:59:16.8 |
HIP 111034 |
24.30 |
| 2026-10-09 12:00 |
22:30:32.18 |
+05:58:09.0 |
HIP 111034 |
22.57 |
| 2026-10-10 00:00 |
22:30:26.67 |
+05:57:01.3 |
HIP 111034 |
20.86 |
| 2026-10-10 12:00 |
22:30:21.22 |
+05:55:53.7 |
HIP 111034 |
19.17 |
| 2026-10-11 00:00 |
22:30:15.84 |
+05:54:46.2 |
HIP 111034 |
17.50 |