| Parameter |
Value |
| Designation |
P/2016 R4 (Gibbs) |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2016-07-20T12:01:25.501440Z |
| Orbit solution date (soln_date, UTC) |
2022-05-19T21:13:38Z |
| Obs used |
196 |
| NEO |
- |
| M1 |
15.600 |
| K1 |
4.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2016-09-22.0000000 |
| e |
0.47506023 |
| q (au) |
2.800531 |
| a (au) |
5.334957 |
| i (deg) |
10.862086 |
| Ω (om, deg) |
168.346862 |
| ω (w, deg) |
174.058692 |
| M (ma, deg) |
5.078958 |
Magnitude
Scatter + Global Linear
$$
M_a = (16.396 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
16.396 |
| n |
2.000 |
| gf |
0.832 |
| gb |
-0.660 |
| k |
0.898 |
| δ90 |
1.046 |
| 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
Finding Chart
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-05-12 00:00 |
14:09:39.81 |
-03:00:56.8 |
HIP 69152 |
5.21 |
| 2026-05-12 12:00 |
14:09:26.04 |
-02:59:41.9 |
HIP 69152 |
4.16 |
| 2026-05-13 00:00 |
14:09:12.34 |
-02:58:27.9 |
HIP 69152 |
5.83 |
| 2026-05-13 12:00 |
14:08:58.70 |
-02:57:14.7 |
HIP 69152 |
8.76 |
| 2026-05-14 00:00 |
14:08:45.13 |
-02:56:02.3 |
HIP 69152 |
12.05 |
| 2026-05-14 12:00 |
14:08:31.62 |
-02:54:50.8 |
HIP 69152 |
15.45 |
| 2026-05-15 00:00 |
14:08:18.19 |
-02:53:40.2 |
HIP 69152 |
18.89 |
| 2026-05-15 12:00 |
14:08:04.82 |
-02:52:30.4 |
HIP 69152 |
22.35 |
| 2026-05-16 00:00 |
14:07:51.54 |
-02:51:21.6 |
HIP 68906 |
21.23 |
| 2026-05-16 12:00 |
14:07:38.32 |
-02:50:13.6 |
HIP 68906 |
17.82 |
| 2026-05-17 00:00 |
14:07:25.19 |
-02:49:06.5 |
HIP 68906 |
14.48 |
| 2026-05-17 12:00 |
14:07:12.13 |
-02:48:00.4 |
HIP 68906 |
11.24 |
| 2026-05-18 00:00 |
14:06:59.16 |
-02:46:55.2 |
HIP 68906 |
8.17 |
| 2026-05-18 12:00 |
14:06:46.28 |
-02:45:50.9 |
HIP 68906 |
5.54 |
| 2026-05-19 00:00 |
14:06:33.48 |
-02:44:47.5 |
HIP 68906 |
4.20 |
| 2026-05-19 12:00 |
14:06:20.77 |
-02:43:45.1 |
HIP 68906 |
5.19 |
| 2026-05-20 00:00 |
14:06:08.15 |
-02:42:43.7 |
HIP 68906 |
7.62 |
| 2026-05-20 12:00 |
14:05:55.62 |
-02:41:43.2 |
HIP 68906 |
10.52 |
| 2026-05-21 00:00 |
14:05:43.18 |
-02:40:43.6 |
HIP 68906 |
13.57 |
| 2026-05-21 12:00 |
14:05:30.85 |
-02:39:45.1 |
HIP 68906 |
16.67 |
| 2026-05-22 00:00 |
14:05:18.60 |
-02:38:47.5 |
HIP 68906 |
19.78 |
| 2026-05-22 12:00 |
14:05:06.46 |
-02:37:50.9 |
HIP 68906 |
22.89 |
| 2026-05-23 00:00 |
14:04:54.42 |
-02:36:55.3 |
HIP 68906 |
25.98 |
| 2026-05-23 12:00 |
14:04:42.49 |
-02:36:00.7 |
HIP 68906 |
29.06 |
| 2026-05-24 00:00 |
14:04:30.66 |
-02:35:07.2 |
HIP 68626 |
27.72 |
| 2026-05-24 12:00 |
14:04:18.93 |
-02:34:14.6 |
HIP 68626 |
24.72 |
| 2026-05-25 00:00 |
14:04:07.31 |
-02:33:23.0 |
HIP 68626 |
21.77 |
| 2026-05-25 12:00 |
14:03:55.80 |
-02:32:32.4 |
HIP 68626 |
18.87 |
| 2026-05-26 00:00 |
14:03:44.40 |
-02:31:42.9 |
HIP 68626 |
16.04 |
| 2026-05-26 12:00 |
14:03:33.11 |
-02:30:54.4 |
HIP 68626 |
13.30 |
| 2026-05-27 00:00 |
14:03:21.94 |
-02:30:06.9 |
HIP 68626 |
10.69 |
| 2026-05-27 12:00 |
14:03:10.88 |
-02:29:20.4 |
HIP 68626 |
8.32 |
| 2026-05-28 00:00 |
14:02:59.94 |
-02:28:35.0 |
HIP 68626 |
6.39 |
| 2026-05-28 12:00 |
14:02:49.11 |
-02:27:50.6 |
HIP 68626 |
5.36 |
| 2026-05-29 00:00 |
14:02:38.41 |
-02:27:07.3 |
HIP 68626 |
5.68 |
| 2026-05-29 12:00 |
14:02:27.82 |
-02:26:25.0 |
HIP 68626 |
7.13 |
| 2026-05-30 00:00 |
14:02:17.35 |
-02:25:43.8 |
HIP 68626 |
9.17 |
| 2026-05-30 12:00 |
14:02:07.01 |
-02:25:03.6 |
HIP 68626 |
11.46 |
| 2026-05-31 00:00 |
14:01:56.79 |
-02:24:24.5 |
HIP 68626 |
13.86 |
| 2026-05-31 12:00 |
14:01:46.70 |
-02:23:46.4 |
HIP 68626 |
16.30 |
| 2026-06-01 00:00 |
14:01:36.73 |
-02:23:09.4 |
HIP 68595 |
17.99 |
| 2026-06-01 12:00 |
14:01:26.89 |
-02:22:33.5 |
HIP 68469 |
17.79 |
| 2026-06-02 00:00 |
14:01:17.18 |
-02:21:58.6 |
HIP 68469 |
17.73 |