229P/Gibbs
| 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
$$
M_a = (11.598 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
11.598 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.822 |
| k |
0.997 |
| δ90 |
9.964 |
| 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) |
| 2026-02-03 00:00 |
06:23:36.86 |
-04:10:54.9 |
HIP 30387 |
30.54 |
| 2026-02-03 12:00 |
06:23:26.87 |
-04:05:47.0 |
HIP 30356 |
35.22 |
| 2026-02-04 00:00 |
06:23:17.20 |
-04:00:38.3 |
HIP 30356 |
29.82 |
| 2026-02-04 12:00 |
06:23:07.83 |
-03:55:29.0 |
HIP 30356 |
24.54 |
| 2026-02-05 00:00 |
06:22:58.76 |
-03:50:19.1 |
HIP 30356 |
19.46 |
| 2026-02-05 12:00 |
06:22:50.01 |
-03:45:08.5 |
HIP 30356 |
14.75 |
| 2026-02-06 00:00 |
06:22:41.56 |
-03:39:57.3 |
HIP 30356 |
10.89 |
| 2026-02-06 12:00 |
06:22:33.43 |
-03:34:45.6 |
HIP 30356 |
9.00 |
| 2026-02-07 00:00 |
06:22:25.60 |
-03:29:33.5 |
HIP 30356 |
10.20 |
| 2026-02-07 12:00 |
06:22:18.09 |
-03:24:20.8 |
HIP 30351 |
13.30 |
| 2026-02-08 00:00 |
06:22:10.90 |
-03:19:07.8 |
HIP 30351 |
12.87 |
| 2026-02-08 12:00 |
06:22:04.01 |
-03:13:54.3 |
HIP 30351 |
14.60 |
| 2026-02-09 00:00 |
06:21:57.44 |
-03:08:40.6 |
HIP 30351 |
17.85 |
| 2026-02-09 12:00 |
06:21:51.19 |
-03:03:26.5 |
HIP 30351 |
21.94 |
| 2026-02-10 00:00 |
06:21:45.25 |
-02:58:12.2 |
HIP 30093 |
26.42 |
| 2026-02-10 12:00 |
06:21:39.63 |
-02:52:57.6 |
HIP 30093 |
25.25 |
| 2026-02-11 00:00 |
06:21:34.33 |
-02:47:42.9 |
HIP 30093 |
25.29 |
| 2026-02-11 12:00 |
06:21:29.35 |
-02:42:28.0 |
HIP 30093 |
26.53 |
| 2026-02-12 00:00 |
06:21:24.68 |
-02:37:13.0 |
HIP 30093 |
28.81 |
| 2026-02-12 12:00 |
06:21:20.33 |
-02:31:57.9 |
HIP 30326 |
29.02 |
| 2026-02-13 00:00 |
06:21:16.30 |
-02:26:42.8 |
HIP 30326 |
26.46 |
| 2026-02-13 12:00 |
06:21:12.59 |
-02:21:27.6 |
HIP 30118 |
22.99 |
| 2026-02-14 00:00 |
06:21:09.20 |
-02:16:12.5 |
HIP 30118 |
18.50 |
| 2026-02-14 12:00 |
06:21:06.13 |
-02:10:57.5 |
HIP 30118 |
14.63 |
| 2026-02-15 00:00 |
06:21:03.38 |
-02:05:42.6 |
HIP 30118 |
12.02 |
| 2026-02-15 12:00 |
06:21:00.95 |
-02:00:27.8 |
HIP 30118 |
11.51 |
| 2026-02-16 00:00 |
06:20:58.83 |
-01:55:13.1 |
HIP 30118 |
13.34 |
| 2026-02-16 12:00 |
06:20:57.04 |
-01:49:58.7 |
HIP 30118 |
16.75 |
| 2026-02-17 00:00 |
06:20:55.57 |
-01:44:44.5 |
HIP 30118 |
20.97 |
| 2026-02-17 12:00 |
06:20:54.41 |
-01:39:30.6 |
HIP 30136 |
18.41 |
| 2026-02-18 00:00 |
06:20:53.58 |
-01:34:17.0 |
HIP 30136 |
13.44 |
| 2026-02-18 12:00 |
06:20:53.06 |
-01:29:03.7 |
HIP 30136 |
8.85 |
| 2026-02-19 00:00 |
06:20:52.86 |
-01:23:50.7 |
HIP 30136 |
5.59 |
| 2026-02-19 12:00 |
06:20:52.98 |
-01:18:38.2 |
HIP 30136 |
6.28 |
| 2026-02-20 00:00 |
06:20:53.41 |
-01:13:26.1 |
HIP 30210 |
6.72 |
| 2026-02-20 12:00 |
06:20:54.16 |
-01:08:14.5 |
HIP 30210 |
8.23 |
| 2026-02-21 00:00 |
06:20:55.23 |
-01:03:03.4 |
HIP 30210 |
11.96 |
| 2026-02-21 12:00 |
06:20:56.61 |
-00:57:52.7 |
HIP 30210 |
16.47 |
| 2026-02-22 00:00 |
06:20:58.31 |
-00:52:42.7 |
HIP 30210 |
21.26 |
| 2026-02-22 12:00 |
06:21:00.31 |
-00:47:33.2 |
HIP 30243 |
18.67 |
| 2026-02-23 00:00 |
06:21:02.63 |
-00:42:24.3 |
HIP 30243 |
14.36 |
| 2026-02-23 12:00 |
06:21:05.26 |
-00:37:16.0 |
HIP 30243 |
10.77 |
| 2026-02-24 00:00 |
06:21:08.21 |
-00:32:08.5 |
HIP 30243 |
8.83 |