| Parameter |
Value |
| Designation |
229P/Gibbs |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2017-05-20T22:45:24.773760Z |
| Orbit solution date (soln_date, UTC) |
2025-07-31T12:12:41Z |
| Obs used |
293 |
| NEO |
- |
| M1 |
13.900 |
| K1 |
9.250 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2015-10-15.0000000 |
| e |
0.37605919 |
| q (au) |
2.454753 |
| a (au) |
3.934273 |
| i (deg) |
26.069392 |
| Ω (om, deg) |
157.911010 |
| ω (w, deg) |
224.219557 |
| M (ma, deg) |
286.246652 |
Magnitude
Scatter + Global Linear
$$
M_a = (11.599 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
11.599 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.822 |
| k |
0.997 |
| δ90 |
9.926 |
| 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 |
07:36:58.65 |
+09:08:59.6 |
HIP 37038 |
9.07 |
| 2026-06-01 12:00 |
07:37:33.53 |
+09:09:41.4 |
HIP 37038 |
14.72 |
| 2026-06-02 00:00 |
07:38:08.44 |
+09:10:21.9 |
HIP 37258 |
20.51 |
| 2026-06-02 12:00 |
07:38:43.39 |
+09:11:01.2 |
HIP 37258 |
16.42 |
| 2026-06-03 00:00 |
07:39:18.39 |
+09:11:39.3 |
HIP 37351 |
12.01 |
| 2026-06-03 12:00 |
07:39:53.43 |
+09:12:16.1 |
HIP 37351 |
6.83 |
| 2026-06-04 00:00 |
07:40:28.50 |
+09:12:51.7 |
HIP 37408 |
7.30 |
| 2026-06-04 12:00 |
07:41:03.61 |
+09:13:26.1 |
HIP 37408 |
6.33 |
| 2026-06-05 00:00 |
07:41:38.77 |
+09:13:59.2 |
HIP 37408 |
13.33 |
| 2026-06-05 12:00 |
07:42:13.95 |
+09:14:31.2 |
HIP 37408 |
21.60 |
| 2026-06-06 00:00 |
07:42:49.18 |
+09:15:01.9 |
HIP 37679 |
25.95 |
| 2026-06-06 12:00 |
07:43:24.44 |
+09:15:31.5 |
HIP 37679 |
21.63 |
| 2026-06-07 00:00 |
07:43:59.74 |
+09:15:59.9 |
HIP 37679 |
20.37 |
| 2026-06-07 12:00 |
07:44:35.07 |
+09:16:27.0 |
HIP 37679 |
22.68 |
| 2026-06-08 00:00 |
07:45:10.43 |
+09:16:53.0 |
HIP 37679 |
27.71 |
| 2026-06-08 12:00 |
07:45:45.83 |
+09:17:17.8 |
HIP 38022 |
32.55 |
| 2026-06-09 00:00 |
07:46:21.26 |
+09:17:41.4 |
HIP 38022 |
26.24 |
| 2026-06-09 12:00 |
07:46:56.72 |
+09:18:03.8 |
HIP 38022 |
21.67 |
| 2026-06-10 00:00 |
07:47:32.22 |
+09:18:25.0 |
HIP 38021 |
19.51 |
| 2026-06-10 12:00 |
07:48:07.74 |
+09:18:45.1 |
HIP 38021 |
21.05 |
| 2026-06-11 00:00 |
07:48:43.29 |
+09:19:04.0 |
HIP 38077 |
25.21 |
| 2026-06-11 12:00 |
07:49:18.88 |
+09:19:21.7 |
HIP 38243 |
27.71 |
| 2026-06-12 00:00 |
07:49:54.49 |
+09:19:38.3 |
HIP 38243 |
25.74 |
| 2026-06-12 12:00 |
07:50:30.13 |
+09:19:53.7 |
HIP 38374 |
18.04 |
| 2026-06-13 00:00 |
07:51:05.79 |
+09:20:08.0 |
HIP 38374 |
9.45 |
| 2026-06-13 12:00 |
07:51:41.48 |
+09:20:21.1 |
HIP 38374 |
2.84 |
| 2026-06-14 00:00 |
07:52:17.20 |
+09:20:33.1 |
HIP 38374 |
9.06 |
| 2026-06-14 12:00 |
07:52:52.94 |
+09:20:43.9 |
HIP 38374 |
17.66 |
| 2026-06-15 00:00 |
07:53:28.71 |
+09:20:53.6 |
HIP 38682 |
25.24 |
| 2026-06-15 12:00 |
07:54:04.49 |
+09:21:02.2 |
HIP 38682 |
16.41 |
| 2026-06-16 00:00 |
07:54:40.30 |
+09:21:09.7 |
HIP 38682 |
7.58 |
| 2026-06-16 12:00 |
07:55:16.13 |
+09:21:16.0 |
HIP 38682 |
1.29 |
| 2026-06-17 00:00 |
07:55:51.99 |
+09:21:21.2 |
HIP 38682 |
10.11 |
| 2026-06-17 12:00 |
07:56:27.86 |
+09:21:25.3 |
HIP 38682 |
18.95 |
| 2026-06-18 00:00 |
07:57:03.74 |
+09:21:28.3 |
HIP 38829 |
19.03 |
| 2026-06-18 12:00 |
07:57:39.65 |
+09:21:30.3 |
HIP 38829 |
22.70 |
| 2026-06-19 00:00 |
07:58:15.57 |
+09:21:31.1 |
HIP 38829 |
28.72 |
| 2026-06-19 12:00 |
07:58:51.51 |
+09:21:30.8 |
HIP 39134 |
31.57 |
| 2026-06-20 00:00 |
07:59:27.47 |
+09:21:29.5 |
HIP 39134 |
26.30 |
| 2026-06-20 12:00 |
08:00:03.43 |
+09:21:27.0 |
HIP 39134 |
23.31 |
| 2026-06-21 00:00 |
08:00:39.42 |
+09:21:23.5 |
HIP 39258 |
22.30 |
| 2026-06-21 12:00 |
08:01:15.41 |
+09:21:19.0 |
HIP 39258 |
17.52 |
| 2026-06-22 00:00 |
08:01:51.42 |
+09:21:13.4 |
HIP 39258 |
16.59 |