| Parameter |
Value |
| Designation |
263P/Gibbs |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2017-09-29T21:29:30.344640Z |
| Orbit solution date (soln_date, UTC) |
2024-06-06T23:12:48Z |
| Obs used |
771 |
| NEO |
Yes |
| M1 |
18.600 |
| K1 |
4.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2018-10-22.0000000 |
| e |
0.58779281 |
| q (au) |
1.261487 |
| a (au) |
3.060323 |
| i (deg) |
11.538377 |
| Ω (om, deg) |
105.807706 |
| ω (w, deg) |
34.574680 |
| M (ma, deg) |
71.265838 |
Magnitude
Scatter + Global Linear
$$
M_a = (19.287 + 2.794\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
19.287 |
| n |
2.794 |
| gf |
1.000 |
| gb |
-0.690 |
| k |
0.800 |
| δ90 |
10.000 |
| 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
Finding Chart
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-06-01 00:00 |
23:29:07.98 |
-12:53:36.6 |
HIP 115987 |
12.21 |
| 2026-06-01 12:00 |
23:29:20.78 |
-12:53:29.5 |
HIP 115987 |
9.09 |
| 2026-06-02 00:00 |
23:29:33.44 |
-12:53:23.6 |
HIP 115987 |
6.02 |
| 2026-06-02 12:00 |
23:29:45.94 |
-12:53:19.0 |
HIP 115987 |
3.00 |
| 2026-06-03 00:00 |
23:29:58.30 |
-12:53:15.7 |
HIP 115987 |
0.67 |
| 2026-06-03 12:00 |
23:30:10.51 |
-12:53:13.6 |
HIP 115987 |
3.13 |
| 2026-06-04 00:00 |
23:30:22.57 |
-12:53:12.7 |
HIP 115987 |
6.04 |
| 2026-06-04 12:00 |
23:30:34.47 |
-12:53:13.2 |
HIP 115987 |
8.93 |
| 2026-06-05 00:00 |
23:30:46.22 |
-12:53:14.9 |
HIP 115987 |
11.79 |
| 2026-06-05 12:00 |
23:30:57.81 |
-12:53:17.9 |
HIP 115987 |
14.62 |
| 2026-06-06 00:00 |
23:31:09.25 |
-12:53:22.2 |
HIP 115987 |
17.40 |
| 2026-06-06 12:00 |
23:31:20.54 |
-12:53:27.8 |
HIP 115987 |
20.15 |
| 2026-06-07 00:00 |
23:31:31.66 |
-12:53:34.7 |
HIP 115987 |
22.87 |
| 2026-06-07 12:00 |
23:31:42.63 |
-12:53:42.9 |
HIP 115987 |
25.54 |
| 2026-06-08 00:00 |
23:31:53.44 |
-12:53:52.4 |
HIP 116178 |
24.87 |
| 2026-06-08 12:00 |
23:32:04.08 |
-12:54:03.3 |
HIP 116258 |
24.04 |
| 2026-06-09 00:00 |
23:32:14.56 |
-12:54:15.4 |
HIP 116258 |
22.16 |
| 2026-06-09 12:00 |
23:32:24.88 |
-12:54:29.0 |
HIP 116258 |
20.47 |
| 2026-06-10 00:00 |
23:32:35.04 |
-12:54:43.8 |
HIP 116258 |
19.01 |
| 2026-06-10 12:00 |
23:32:45.03 |
-12:55:00.0 |
HIP 116258 |
17.82 |
| 2026-06-11 00:00 |
23:32:54.85 |
-12:55:17.6 |
HIP 116258 |
16.94 |
| 2026-06-11 12:00 |
23:33:04.51 |
-12:55:36.5 |
HIP 116258 |
16.41 |
| 2026-06-12 00:00 |
23:33:13.99 |
-12:55:56.8 |
HIP 116258 |
16.24 |
| 2026-06-12 12:00 |
23:33:23.31 |
-12:56:18.5 |
HIP 116258 |
16.43 |
| 2026-06-13 00:00 |
23:33:32.45 |
-12:56:41.5 |
HIP 116258 |
16.95 |
| 2026-06-13 12:00 |
23:33:41.43 |
-12:57:06.0 |
HIP 116258 |
17.75 |
| 2026-06-14 00:00 |
23:33:50.22 |
-12:57:31.8 |
HIP 116258 |
18.79 |
| 2026-06-14 12:00 |
23:33:58.85 |
-12:57:59.0 |
HIP 116258 |
20.03 |
| 2026-06-15 00:00 |
23:34:07.29 |
-12:58:27.6 |
HIP 116258 |
21.40 |
| 2026-06-15 12:00 |
23:34:15.56 |
-12:58:57.6 |
HIP 116258 |
22.89 |
| 2026-06-16 00:00 |
23:34:23.66 |
-12:59:29.0 |
HIP 116258 |
24.45 |
| 2026-06-16 12:00 |
23:34:31.57 |
-13:00:01.8 |
HIP 116258 |
26.07 |
| 2026-06-17 00:00 |
23:34:39.30 |
-13:00:36.0 |
HIP 116258 |
27.73 |
| 2026-06-17 12:00 |
23:34:46.86 |
-13:01:11.6 |
HIP 116258 |
29.41 |
| 2026-06-18 00:00 |
23:34:54.23 |
-13:01:48.7 |
HIP 116446 |
28.33 |
| 2026-06-18 12:00 |
23:35:01.42 |
-13:02:27.2 |
HIP 116446 |
27.02 |
| 2026-06-19 00:00 |
23:35:08.42 |
-13:03:07.0 |
HIP 116446 |
25.77 |
| 2026-06-19 12:00 |
23:35:15.24 |
-13:03:48.3 |
HIP 116446 |
24.59 |
| 2026-06-20 00:00 |
23:35:21.88 |
-13:04:31.1 |
HIP 116446 |
23.47 |
| 2026-06-20 12:00 |
23:35:28.33 |
-13:05:15.2 |
HIP 116446 |
22.42 |
| 2026-06-21 00:00 |
23:35:34.59 |
-13:06:00.8 |
HIP 116446 |
21.45 |
| 2026-06-21 12:00 |
23:35:40.66 |
-13:06:47.8 |
HIP 116446 |
20.54 |
| 2026-06-22 00:00 |
23:35:46.55 |
-13:07:36.2 |
HIP 116446 |
19.71 |