| 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
$$
M_a = (14.129 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
14.129 |
| n |
2.000 |
| gf |
0.980 |
| gb |
-0.500 |
| k |
0.803 |
| δ90 |
2.051 |
| 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) |
| 2026-05-12 00:00 |
22:49:35.64 |
+06:57:19.0 |
HIP 112877 |
35.10 |
| 2026-05-12 12:00 |
22:49:41.04 |
+06:58:19.1 |
HIP 112877 |
34.64 |
| 2026-05-13 00:00 |
22:49:46.37 |
+06:59:18.8 |
HIP 112877 |
34.26 |
| 2026-05-13 12:00 |
22:49:51.64 |
+07:00:18.3 |
HIP 112877 |
33.97 |
| 2026-05-14 00:00 |
22:49:56.83 |
+07:01:17.5 |
HIP 112877 |
33.77 |
| 2026-05-14 12:00 |
22:50:01.95 |
+07:02:16.5 |
HIP 112877 |
33.65 |
| 2026-05-15 00:00 |
22:50:07.01 |
+07:03:15.1 |
HIP 112877 |
33.62 |
| 2026-05-15 12:00 |
22:50:11.99 |
+07:04:13.5 |
HIP 112877 |
33.66 |
| 2026-05-16 00:00 |
22:50:16.90 |
+07:05:11.5 |
HIP 112877 |
33.79 |
| 2026-05-16 12:00 |
22:50:21.74 |
+07:06:09.3 |
HIP 112877 |
33.99 |
| 2026-05-17 00:00 |
22:50:26.51 |
+07:07:06.7 |
HIP 112740 |
33.40 |
| 2026-05-17 12:00 |
22:50:31.21 |
+07:08:03.9 |
HIP 112740 |
32.77 |
| 2026-05-18 00:00 |
22:50:35.84 |
+07:09:00.7 |
HIP 112740 |
32.19 |
| 2026-05-18 12:00 |
22:50:40.39 |
+07:09:57.2 |
HIP 112740 |
31.67 |
| 2026-05-19 00:00 |
22:50:44.87 |
+07:10:53.4 |
HIP 112740 |
31.21 |
| 2026-05-19 12:00 |
22:50:49.28 |
+07:11:49.3 |
HIP 112740 |
30.81 |
| 2026-05-20 00:00 |
22:50:53.61 |
+07:12:44.8 |
HIP 112740 |
30.46 |
| 2026-05-20 12:00 |
22:50:57.88 |
+07:13:40.1 |
HIP 112740 |
30.18 |
| 2026-05-21 00:00 |
22:51:02.06 |
+07:14:34.9 |
HIP 112740 |
29.95 |
| 2026-05-21 12:00 |
22:51:06.18 |
+07:15:29.5 |
HIP 112740 |
29.78 |
| 2026-05-22 00:00 |
22:51:10.22 |
+07:16:23.7 |
HIP 112740 |
29.67 |
| 2026-05-22 12:00 |
22:51:14.19 |
+07:17:17.5 |
HIP 112740 |
29.60 |
| 2026-05-23 00:00 |
22:51:18.08 |
+07:18:11.0 |
HIP 112953 |
28.43 |
| 2026-05-23 12:00 |
22:51:21.90 |
+07:19:04.2 |
HIP 112953 |
27.14 |
| 2026-05-24 00:00 |
22:51:25.64 |
+07:19:57.0 |
HIP 112953 |
25.86 |
| 2026-05-24 12:00 |
22:51:29.31 |
+07:20:49.4 |
HIP 112953 |
24.61 |
| 2026-05-25 00:00 |
22:51:32.90 |
+07:21:41.5 |
HIP 112953 |
23.37 |
| 2026-05-25 12:00 |
22:51:36.42 |
+07:22:33.2 |
HIP 112953 |
22.15 |
| 2026-05-26 00:00 |
22:51:39.87 |
+07:23:24.6 |
HIP 112953 |
20.94 |
| 2026-05-26 12:00 |
22:51:43.23 |
+07:24:15.6 |
HIP 112953 |
19.75 |
| 2026-05-27 00:00 |
22:51:46.53 |
+07:25:06.2 |
HIP 112953 |
18.58 |
| 2026-05-27 12:00 |
22:51:49.74 |
+07:25:56.4 |
HIP 112953 |
17.43 |
| 2026-05-28 00:00 |
22:51:52.88 |
+07:26:46.3 |
HIP 112953 |
16.29 |
| 2026-05-28 12:00 |
22:51:55.95 |
+07:27:35.7 |
HIP 112953 |
15.18 |
| 2026-05-29 00:00 |
22:51:58.94 |
+07:28:24.8 |
HIP 112953 |
14.07 |
| 2026-05-29 12:00 |
22:52:01.85 |
+07:29:13.5 |
HIP 112953 |
12.99 |
| 2026-05-30 00:00 |
22:52:04.68 |
+07:30:01.8 |
HIP 112953 |
11.92 |
| 2026-05-30 12:00 |
22:52:07.44 |
+07:30:49.7 |
HIP 112953 |
10.87 |
| 2026-05-31 00:00 |
22:52:10.12 |
+07:31:37.2 |
HIP 112953 |
9.84 |
| 2026-05-31 12:00 |
22:52:12.72 |
+07:32:24.3 |
HIP 112953 |
8.83 |
| 2026-06-01 00:00 |
22:52:15.25 |
+07:33:11.0 |
HIP 112953 |
7.83 |
| 2026-06-01 12:00 |
22:52:17.70 |
+07:33:57.3 |
HIP 112953 |
6.85 |
| 2026-06-02 00:00 |
22:52:20.07 |
+07:34:43.2 |
HIP 112953 |
5.88 |