| Parameter |
Value |
| Designation |
C/2015 W1 (Gibbs) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2016-05-17T04:39:36.486720Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:33:17Z |
| Obs used |
355 |
| NEO |
- |
| M1 |
12.700 |
| K1 |
9.500 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2016-01-02.0000000 |
| e |
1.00128700 |
| q (au) |
2.231883 |
| a (au) |
-1734.174037 |
| i (deg) |
87.318151 |
| Ω (om, deg) |
114.314858 |
| ω (w, deg) |
48.113799 |
| M (ma, deg) |
-0.001859 |
Magnitude
Scatter + Global Linear
$$
M_a = (14.313 + 2.054\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
14.313 |
| n |
2.054 |
| gf |
0.983 |
| gb |
-0.916 |
| k |
0.999 |
| δ90 |
1.000 |
| 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) |
| 2026-06-01 00:00 |
20:06:42.64 |
-33:38:43.6 |
HIP 98961 |
21.21 |
| 2026-06-01 12:00 |
20:06:38.94 |
-33:39:13.0 |
HIP 98961 |
20.32 |
| 2026-06-02 00:00 |
20:06:35.20 |
-33:39:42.5 |
HIP 98961 |
19.44 |
| 2026-06-02 12:00 |
20:06:31.41 |
-33:40:11.9 |
HIP 98961 |
18.55 |
| 2026-06-03 00:00 |
20:06:27.59 |
-33:40:41.4 |
HIP 98961 |
17.66 |
| 2026-06-03 12:00 |
20:06:23.73 |
-33:41:10.8 |
HIP 98961 |
16.76 |
| 2026-06-04 00:00 |
20:06:19.84 |
-33:41:40.2 |
HIP 98961 |
15.87 |
| 2026-06-04 12:00 |
20:06:15.90 |
-33:42:09.7 |
HIP 98961 |
14.99 |
| 2026-06-05 00:00 |
20:06:11.93 |
-33:42:39.1 |
HIP 98961 |
14.10 |
| 2026-06-05 12:00 |
20:06:07.92 |
-33:43:08.5 |
HIP 98961 |
13.23 |
| 2026-06-06 00:00 |
20:06:03.87 |
-33:43:37.9 |
HIP 98961 |
12.36 |
| 2026-06-06 12:00 |
20:05:59.79 |
-33:44:07.3 |
HIP 98961 |
11.50 |
| 2026-06-07 00:00 |
20:05:55.67 |
-33:44:36.7 |
HIP 98961 |
10.67 |
| 2026-06-07 12:00 |
20:05:51.51 |
-33:45:06.0 |
HIP 98961 |
9.86 |
| 2026-06-08 00:00 |
20:05:47.32 |
-33:45:35.3 |
HIP 98961 |
9.08 |
| 2026-06-08 12:00 |
20:05:43.09 |
-33:46:04.6 |
HIP 98961 |
8.35 |
| 2026-06-09 00:00 |
20:05:38.83 |
-33:46:33.9 |
HIP 98961 |
7.68 |
| 2026-06-09 12:00 |
20:05:34.53 |
-33:47:03.2 |
HIP 98961 |
7.09 |
| 2026-06-10 00:00 |
20:05:30.20 |
-33:47:32.4 |
HIP 98961 |
6.61 |
| 2026-06-10 12:00 |
20:05:25.83 |
-33:48:01.6 |
HIP 98898 |
6.10 |
| 2026-06-11 00:00 |
20:05:21.43 |
-33:48:30.7 |
HIP 98898 |
5.60 |
| 2026-06-11 12:00 |
20:05:16.99 |
-33:48:59.9 |
HIP 98898 |
5.24 |
| 2026-06-12 00:00 |
20:05:12.52 |
-33:49:28.9 |
HIP 98898 |
5.08 |
| 2026-06-12 12:00 |
20:05:08.02 |
-33:49:58.0 |
HIP 98898 |
5.12 |
| 2026-06-13 00:00 |
20:05:03.49 |
-33:50:27.0 |
HIP 98898 |
5.38 |
| 2026-06-13 12:00 |
20:04:58.92 |
-33:50:56.0 |
HIP 98898 |
5.81 |
| 2026-06-14 00:00 |
20:04:54.32 |
-33:51:24.9 |
HIP 98898 |
6.40 |
| 2026-06-14 12:00 |
20:04:49.69 |
-33:51:53.7 |
HIP 98898 |
7.10 |
| 2026-06-15 00:00 |
20:04:45.03 |
-33:52:22.5 |
HIP 98898 |
7.89 |
| 2026-06-15 12:00 |
20:04:40.34 |
-33:52:51.3 |
HIP 98898 |
8.74 |
| 2026-06-16 00:00 |
20:04:35.61 |
-33:53:20.0 |
HIP 98898 |
9.65 |
| 2026-06-16 12:00 |
20:04:30.86 |
-33:53:48.7 |
HIP 98898 |
10.59 |
| 2026-06-17 00:00 |
20:04:26.08 |
-33:54:17.3 |
HIP 98898 |
11.56 |
| 2026-06-17 12:00 |
20:04:21.27 |
-33:54:45.8 |
HIP 98898 |
12.55 |
| 2026-06-18 00:00 |
20:04:16.43 |
-33:55:14.2 |
HIP 98898 |
13.57 |
| 2026-06-18 12:00 |
20:04:11.56 |
-33:55:42.6 |
HIP 98898 |
14.60 |
| 2026-06-19 00:00 |
20:04:06.66 |
-33:56:11.0 |
HIP 98898 |
15.65 |
| 2026-06-19 12:00 |
20:04:01.73 |
-33:56:39.2 |
HIP 98898 |
16.71 |
| 2026-06-20 00:00 |
20:03:56.78 |
-33:57:07.4 |
HIP 98898 |
17.78 |
| 2026-06-20 12:00 |
20:03:51.80 |
-33:57:35.5 |
HIP 98898 |
18.86 |
| 2026-06-21 00:00 |
20:03:46.80 |
-33:58:03.6 |
HIP 98898 |
19.96 |
| 2026-06-21 12:00 |
20:03:41.77 |
-33:58:31.5 |
HIP 98898 |
21.05 |
| 2026-06-22 00:00 |
20:03:36.71 |
-33:58:59.4 |
HIP 98898 |
22.16 |