339P/Gibbs
| Parameter |
Value |
| Designation |
339P/Gibbs |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2009-06-25T23:39:29.223360Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:28:30Z |
| Obs used |
141 |
| NEO |
- |
| M1 |
12.300 |
| K1 |
38.250 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2010-05-23.0000000 |
| e |
0.63978977 |
| q (au) |
1.324237 |
| a (au) |
3.676289 |
| i (deg) |
5.748418 |
| Ω (om, deg) |
172.775845 |
| ω (w, deg) |
27.162682 |
| M (ma, deg) |
46.284585 |
Magnitude
Scatter + Global Linear
$$
M_a = (15.325 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
15.325 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-1.000 |
| 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
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
23:46:38.40 |
-02:25:12.7 |
HIP 117333 |
20.66 |
| 2026-02-03 12:00 |
23:46:56.19 |
-02:23:22.3 |
HIP 117333 |
16.63 |
| 2026-02-04 00:00 |
23:47:14.04 |
-02:21:31.5 |
HIP 117333 |
13.13 |
| 2026-02-04 12:00 |
23:47:31.95 |
-02:19:40.3 |
HIP 117333 |
10.72 |
| 2026-02-05 00:00 |
23:47:49.92 |
-02:17:48.7 |
HIP 117333 |
10.21 |
| 2026-02-05 12:00 |
23:48:07.96 |
-02:15:56.7 |
HIP 117333 |
11.88 |
| 2026-02-06 00:00 |
23:48:26.06 |
-02:14:04.3 |
HIP 117333 |
15.02 |
| 2026-02-06 12:00 |
23:48:44.21 |
-02:12:11.6 |
HIP 117333 |
18.94 |
| 2026-02-07 00:00 |
23:49:02.43 |
-02:10:18.4 |
HIP 117333 |
23.26 |
| 2026-02-07 12:00 |
23:49:20.70 |
-02:08:24.9 |
HIP 117333 |
27.79 |
| 2026-02-08 00:00 |
23:49:39.03 |
-02:06:31.0 |
HIP 117612 |
24.85 |
| 2026-02-08 12:00 |
23:49:57.41 |
-02:04:36.8 |
HIP 117612 |
19.88 |
| 2026-02-09 00:00 |
23:50:15.85 |
-02:02:42.2 |
HIP 117612 |
14.90 |
| 2026-02-09 12:00 |
23:50:34.35 |
-02:00:47.2 |
HIP 117612 |
9.91 |
| 2026-02-10 00:00 |
23:50:52.90 |
-01:58:51.9 |
HIP 117612 |
4.94 |
| 2026-02-10 12:00 |
23:51:11.51 |
-01:56:56.2 |
HIP 117612 |
0.92 |
| 2026-02-11 00:00 |
23:51:30.17 |
-01:55:00.2 |
HIP 117612 |
5.30 |
| 2026-02-11 12:00 |
23:51:48.88 |
-01:53:03.9 |
HIP 117612 |
10.33 |
| 2026-02-12 00:00 |
23:52:07.64 |
-01:51:07.3 |
HIP 117612 |
15.39 |
| 2026-02-12 12:00 |
23:52:26.45 |
-01:49:10.3 |
HIP 117612 |
20.47 |
| 2026-02-13 00:00 |
23:52:45.31 |
-01:47:13.0 |
HIP 117820 |
15.92 |
| 2026-02-13 12:00 |
23:53:04.23 |
-01:45:15.4 |
HIP 117820 |
10.84 |
| 2026-02-14 00:00 |
23:53:23.19 |
-01:43:17.5 |
HIP 117820 |
5.82 |
| 2026-02-14 12:00 |
23:53:42.20 |
-01:41:19.2 |
HIP 117820 |
1.69 |
| 2026-02-15 00:00 |
23:54:01.25 |
-01:39:20.7 |
HIP 117820 |
4.98 |
| 2026-02-15 12:00 |
23:54:20.35 |
-01:37:21.9 |
HIP 117820 |
10.01 |
| 2026-02-16 00:00 |
23:54:39.50 |
-01:35:22.8 |
HIP 117820 |
15.14 |
| 2026-02-16 12:00 |
23:54:58.69 |
-01:33:23.5 |
HIP 117820 |
20.31 |
| 2026-02-17 00:00 |
23:55:17.93 |
-01:31:23.8 |
HIP 117820 |
25.51 |
| 2026-02-17 12:00 |
23:55:37.21 |
-01:29:23.9 |
HIP 117937 |
24.91 |
| 2026-02-18 00:00 |
23:55:56.53 |
-01:27:23.7 |
HIP 117937 |
24.18 |
| 2026-02-18 12:00 |
23:56:15.90 |
-01:25:23.3 |
HIP 117937 |
24.57 |
| 2026-02-19 00:00 |
23:56:35.30 |
-01:23:22.6 |
HIP 117937 |
26.03 |
| 2026-02-19 12:00 |
23:56:54.75 |
-01:21:21.7 |
HIP 118028 |
26.30 |
| 2026-02-20 00:00 |
23:57:14.23 |
-01:19:20.5 |
HIP 118028 |
26.13 |
| 2026-02-20 12:00 |
23:57:33.76 |
-01:17:19.1 |
HIP 118028 |
27.00 |
| 2026-02-21 00:00 |
23:57:53.32 |
-01:15:17.5 |
HIP 118199 |
27.70 |
| 2026-02-21 12:00 |
23:58:12.92 |
-01:13:15.6 |
HIP 118199 |
28.42 |
| 2026-02-22 00:00 |
23:58:32.55 |
-01:11:13.6 |
HIP 118199 |
30.09 |
| 2026-02-22 12:00 |
23:58:52.22 |
-01:09:11.3 |
HIP 118199 |
32.54 |
| 2026-02-23 00:00 |
23:59:11.92 |
-01:07:08.8 |
HIP 118199 |
35.64 |
| 2026-02-23 12:00 |
23:59:31.66 |
-01:05:06.1 |
HIP 134 |
32.75 |
| 2026-02-24 00:00 |
23:59:51.43 |
-01:03:03.3 |
HIP 134 |
28.16 |