| 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) |
| 2026-09-20 00:00 |
01:01:51.39 |
+04:03:46.1 |
HIP 5023 |
38.74 |
| 2026-09-20 12:00 |
01:01:36.33 |
+04:01:59.1 |
HIP 4759 |
36.79 |
| 2026-09-21 00:00 |
01:01:21.19 |
+04:00:11.7 |
HIP 4759 |
34.52 |
| 2026-09-21 12:00 |
01:01:05.99 |
+03:58:23.9 |
HIP 4759 |
32.63 |
| 2026-09-22 00:00 |
01:00:50.72 |
+03:56:35.9 |
HIP 4759 |
31.18 |
| 2026-09-22 12:00 |
01:00:35.38 |
+03:54:47.5 |
HIP 4759 |
30.26 |
| 2026-09-23 00:00 |
01:00:19.97 |
+03:52:58.8 |
HIP 4759 |
29.92 |
| 2026-09-23 12:00 |
01:00:04.51 |
+03:51:09.8 |
HIP 4582 |
29.46 |
| 2026-09-24 00:00 |
00:59:48.99 |
+03:49:20.5 |
HIP 4582 |
28.37 |
| 2026-09-24 12:00 |
00:59:33.40 |
+03:47:31.0 |
HIP 4582 |
27.90 |
| 2026-09-25 00:00 |
00:59:17.77 |
+03:45:41.2 |
HIP 4582 |
28.08 |
| 2026-09-25 12:00 |
00:59:02.08 |
+03:43:51.3 |
HIP 4660 |
28.67 |
| 2026-09-26 00:00 |
00:58:46.33 |
+03:42:01.0 |
HIP 4660 |
29.09 |
| 2026-09-26 12:00 |
00:58:30.54 |
+03:40:10.6 |
HIP 4660 |
30.15 |
| 2026-09-27 00:00 |
00:58:14.71 |
+03:38:20.0 |
HIP 4660 |
31.77 |
| 2026-09-27 12:00 |
00:57:58.82 |
+03:36:29.2 |
HIP 4370 |
29.53 |
| 2026-09-28 00:00 |
00:57:42.90 |
+03:34:38.3 |
HIP 4370 |
25.93 |
| 2026-09-28 12:00 |
00:57:26.93 |
+03:32:47.2 |
HIP 4370 |
22.61 |
| 2026-09-29 00:00 |
00:57:10.93 |
+03:30:55.9 |
HIP 4370 |
19.70 |
| 2026-09-29 12:00 |
00:56:54.89 |
+03:29:04.6 |
HIP 4370 |
17.43 |
| 2026-09-30 00:00 |
00:56:38.81 |
+03:27:13.1 |
HIP 4370 |
16.06 |
| 2026-09-30 12:00 |
00:56:22.71 |
+03:25:21.5 |
HIP 4370 |
15.85 |
| 2026-10-01 00:00 |
00:56:06.57 |
+03:23:29.9 |
HIP 4370 |
16.85 |
| 2026-10-01 12:00 |
00:55:50.40 |
+03:21:38.2 |
HIP 4370 |
18.87 |
| 2026-10-02 00:00 |
00:55:34.22 |
+03:19:46.5 |
HIP 4370 |
21.62 |
| 2026-10-02 12:00 |
00:55:18.00 |
+03:17:54.7 |
HIP 4370 |
24.88 |
| 2026-10-03 00:00 |
00:55:01.77 |
+03:16:02.9 |
HIP 4186 |
23.37 |
| 2026-10-03 12:00 |
00:54:45.52 |
+03:14:11.1 |
HIP 4186 |
19.62 |
| 2026-10-04 00:00 |
00:54:29.25 |
+03:12:19.3 |
HIP 4186 |
16.24 |
| 2026-10-04 12:00 |
00:54:12.97 |
+03:10:27.6 |
HIP 4186 |
13.51 |
| 2026-10-05 00:00 |
00:53:56.67 |
+03:08:35.9 |
HIP 4186 |
11.87 |
| 2026-10-05 12:00 |
00:53:40.37 |
+03:06:44.2 |
HIP 4186 |
11.81 |
| 2026-10-06 00:00 |
00:53:24.06 |
+03:04:52.6 |
HIP 4186 |
13.34 |
| 2026-10-06 12:00 |
00:53:07.75 |
+03:03:01.2 |
HIP 4186 |
16.01 |
| 2026-10-07 00:00 |
00:52:51.43 |
+03:01:09.8 |
HIP 4186 |
19.36 |
| 2026-10-07 12:00 |
00:52:35.12 |
+02:59:18.6 |
HIP 4186 |
23.10 |
| 2026-10-08 00:00 |
00:52:18.81 |
+02:57:27.5 |
HIP 3973 |
22.57 |
| 2026-10-08 12:00 |
00:52:02.50 |
+02:55:36.5 |
HIP 3973 |
18.19 |
| 2026-10-09 00:00 |
00:51:46.21 |
+02:53:45.8 |
HIP 3973 |
13.86 |
| 2026-10-09 12:00 |
00:51:29.92 |
+02:51:55.2 |
HIP 3973 |
9.68 |
| 2026-10-10 00:00 |
00:51:13.65 |
+02:50:04.8 |
HIP 3973 |
5.92 |
| 2026-10-10 12:00 |
00:50:57.39 |
+02:48:14.7 |
HIP 3973 |
4.03 |
| 2026-10-11 00:00 |
00:50:41.15 |
+02:46:24.8 |
HIP 3973 |
6.09 |