| 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) |
| 2026-07-29 00:00 |
01:16:40.00 |
+06:05:13.8 |
HIP 6040 |
18.40 |
| 2026-07-29 12:00 |
01:16:39.64 |
+06:04:53.3 |
HIP 6040 |
18.25 |
| 2026-07-30 00:00 |
01:16:39.13 |
+06:04:31.8 |
HIP 6040 |
18.12 |
| 2026-07-30 12:00 |
01:16:38.46 |
+06:04:09.3 |
HIP 6040 |
18.01 |
| 2026-07-31 00:00 |
01:16:37.62 |
+06:03:45.9 |
HIP 6040 |
17.94 |
| 2026-07-31 12:00 |
01:16:36.63 |
+06:03:21.4 |
HIP 6040 |
17.90 |
| 2026-08-01 00:00 |
01:16:35.48 |
+06:02:56.0 |
HIP 6040 |
17.90 |
| 2026-08-01 12:00 |
01:16:34.17 |
+06:02:29.5 |
HIP 6040 |
17.94 |
| 2026-08-02 00:00 |
01:16:32.69 |
+06:02:02.1 |
HIP 6040 |
18.02 |
| 2026-08-02 12:00 |
01:16:31.05 |
+06:01:33.7 |
HIP 6040 |
18.15 |
| 2026-08-03 00:00 |
01:16:29.26 |
+06:01:04.3 |
HIP 6040 |
18.32 |
| 2026-08-03 12:00 |
01:16:27.30 |
+06:00:33.9 |
HIP 6040 |
18.55 |
| 2026-08-04 00:00 |
01:16:25.17 |
+06:00:02.5 |
HIP 6040 |
18.83 |
| 2026-08-04 12:00 |
01:16:22.89 |
+05:59:30.1 |
HIP 6040 |
19.18 |
| 2026-08-05 00:00 |
01:16:20.44 |
+05:58:56.7 |
HIP 6040 |
19.58 |
| 2026-08-05 12:00 |
01:16:17.84 |
+05:58:22.3 |
HIP 6040 |
20.04 |
| 2026-08-06 00:00 |
01:16:15.06 |
+05:57:46.9 |
HIP 6040 |
20.56 |
| 2026-08-06 12:00 |
01:16:12.13 |
+05:57:10.5 |
HIP 6040 |
21.14 |
| 2026-08-07 00:00 |
01:16:09.03 |
+05:56:33.1 |
HIP 6040 |
21.79 |
| 2026-08-07 12:00 |
01:16:05.77 |
+05:55:54.7 |
HIP 6040 |
22.50 |
| 2026-08-08 00:00 |
01:16:02.35 |
+05:55:15.3 |
HIP 6040 |
23.28 |
| 2026-08-08 12:00 |
01:15:58.76 |
+05:54:35.0 |
HIP 6040 |
24.11 |
| 2026-08-09 00:00 |
01:15:55.01 |
+05:53:53.6 |
HIP 6040 |
25.01 |
| 2026-08-09 12:00 |
01:15:51.09 |
+05:53:11.2 |
HIP 6040 |
25.97 |
| 2026-08-10 00:00 |
01:15:47.01 |
+05:52:27.8 |
HIP 6040 |
26.99 |
| 2026-08-10 12:00 |
01:15:42.77 |
+05:51:43.5 |
HIP 6040 |
28.07 |
| 2026-08-11 00:00 |
01:15:38.37 |
+05:50:58.1 |
HIP 6040 |
29.21 |
| 2026-08-11 12:00 |
01:15:33.80 |
+05:50:11.8 |
HIP 6040 |
30.41 |
| 2026-08-12 00:00 |
01:15:29.07 |
+05:49:24.4 |
HIP 6040 |
31.66 |
| 2026-08-12 12:00 |
01:15:24.17 |
+05:48:36.1 |
HIP 6040 |
32.97 |
| 2026-08-13 00:00 |
01:15:19.12 |
+05:47:46.8 |
HIP 6040 |
34.33 |
| 2026-08-13 12:00 |
01:15:13.90 |
+05:46:56.5 |
HIP 6040 |
35.75 |
| 2026-08-14 00:00 |
01:15:08.52 |
+05:46:05.2 |
HIP 6040 |
37.22 |
| 2026-08-14 12:00 |
01:15:02.97 |
+05:45:13.0 |
HIP 6040 |
38.75 |
| 2026-08-15 00:00 |
01:14:57.27 |
+05:44:19.8 |
HIP 5752 |
39.37 |
| 2026-08-15 12:00 |
01:14:51.40 |
+05:43:25.6 |
HIP 5752 |
37.96 |
| 2026-08-16 00:00 |
01:14:45.38 |
+05:42:30.5 |
HIP 5752 |
36.54 |
| 2026-08-16 12:00 |
01:14:39.19 |
+05:41:34.4 |
HIP 5752 |
35.12 |
| 2026-08-17 00:00 |
01:14:32.85 |
+05:40:37.3 |
HIP 5752 |
33.71 |
| 2026-08-17 12:00 |
01:14:26.34 |
+05:39:39.3 |
HIP 5752 |
32.32 |
| 2026-08-18 00:00 |
01:14:19.68 |
+05:38:40.3 |
HIP 5752 |
30.96 |
| 2026-08-18 12:00 |
01:14:12.86 |
+05:37:40.4 |
HIP 5752 |
29.64 |
| 2026-08-19 00:00 |
01:14:05.88 |
+05:36:39.6 |
HIP 5752 |
28.37 |