| 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) |
| 2026-05-12 00:00 |
00:50:45.96 |
+04:03:58.8 |
HIP 4056 |
17.53 |
| 2026-05-12 12:00 |
00:51:03.44 |
+04:05:37.8 |
HIP 4056 |
13.32 |
| 2026-05-13 00:00 |
00:51:20.85 |
+04:07:16.4 |
HIP 4056 |
9.55 |
| 2026-05-13 12:00 |
00:51:38.20 |
+04:08:54.5 |
HIP 4056 |
6.94 |
| 2026-05-14 00:00 |
00:51:55.49 |
+04:10:32.1 |
HIP 4056 |
6.92 |
| 2026-05-14 12:00 |
00:52:12.72 |
+04:12:09.2 |
HIP 4056 |
9.47 |
| 2026-05-15 00:00 |
00:52:29.87 |
+04:13:45.8 |
HIP 4056 |
13.16 |
| 2026-05-15 12:00 |
00:52:46.97 |
+04:15:21.9 |
HIP 4176 |
13.02 |
| 2026-05-16 00:00 |
00:53:04.00 |
+04:16:57.5 |
HIP 4176 |
12.40 |
| 2026-05-16 12:00 |
00:53:20.96 |
+04:18:32.6 |
HIP 4176 |
13.37 |
| 2026-05-17 00:00 |
00:53:37.85 |
+04:20:07.1 |
HIP 4176 |
15.62 |
| 2026-05-17 12:00 |
00:53:54.68 |
+04:21:41.2 |
HIP 4176 |
18.69 |
| 2026-05-18 00:00 |
00:54:11.43 |
+04:23:14.7 |
HIP 4176 |
22.23 |
| 2026-05-18 12:00 |
00:54:28.12 |
+04:24:47.7 |
HIP 4352 |
20.83 |
| 2026-05-19 00:00 |
00:54:44.73 |
+04:26:20.2 |
HIP 4352 |
16.42 |
| 2026-05-19 12:00 |
00:55:01.27 |
+04:27:52.1 |
HIP 4352 |
12.05 |
| 2026-05-20 00:00 |
00:55:17.74 |
+04:29:23.5 |
HIP 4352 |
7.72 |
| 2026-05-20 12:00 |
00:55:34.14 |
+04:30:54.3 |
HIP 4352 |
3.53 |
| 2026-05-21 00:00 |
00:55:50.47 |
+04:32:24.6 |
HIP 4352 |
1.81 |
| 2026-05-21 12:00 |
00:56:06.72 |
+04:33:54.4 |
HIP 4352 |
5.61 |
| 2026-05-22 00:00 |
00:56:22.90 |
+04:35:23.6 |
HIP 4352 |
9.83 |
| 2026-05-22 12:00 |
00:56:39.00 |
+04:36:52.2 |
HIP 4352 |
14.07 |
| 2026-05-23 00:00 |
00:56:55.02 |
+04:38:20.2 |
HIP 4352 |
18.31 |
| 2026-05-23 12:00 |
00:57:10.97 |
+04:39:47.7 |
HIP 4352 |
22.53 |
| 2026-05-24 00:00 |
00:57:26.84 |
+04:41:14.7 |
HIP 4352 |
26.74 |
| 2026-05-24 12:00 |
00:57:42.64 |
+04:42:41.0 |
HIP 4557 |
26.47 |
| 2026-05-25 00:00 |
00:57:58.35 |
+04:44:06.8 |
HIP 4557 |
26.81 |
| 2026-05-25 12:00 |
00:58:13.99 |
+04:45:32.0 |
HIP 4557 |
27.76 |
| 2026-05-26 00:00 |
00:58:29.55 |
+04:46:56.6 |
HIP 4557 |
29.27 |
| 2026-05-26 12:00 |
00:58:45.03 |
+04:48:20.7 |
HIP 4557 |
31.24 |
| 2026-05-27 00:00 |
00:59:00.42 |
+04:49:44.1 |
HIP 4737 |
27.47 |
| 2026-05-27 12:00 |
00:59:15.74 |
+04:51:07.0 |
HIP 4737 |
23.68 |
| 2026-05-28 00:00 |
00:59:30.97 |
+04:52:29.2 |
HIP 4737 |
20.01 |
| 2026-05-28 12:00 |
00:59:46.12 |
+04:53:50.9 |
HIP 4737 |
16.53 |
| 2026-05-29 00:00 |
01:00:01.19 |
+04:55:11.9 |
HIP 4737 |
13.36 |
| 2026-05-29 12:00 |
01:00:16.18 |
+04:56:32.4 |
HIP 4737 |
10.78 |
| 2026-05-30 00:00 |
01:00:31.08 |
+04:57:52.2 |
HIP 4737 |
9.23 |
| 2026-05-30 12:00 |
01:00:45.89 |
+04:59:11.4 |
HIP 4737 |
9.23 |
| 2026-05-31 00:00 |
01:01:00.62 |
+05:00:30.1 |
HIP 4737 |
10.75 |
| 2026-05-31 12:00 |
01:01:15.27 |
+05:01:48.1 |
HIP 4790 |
7.52 |
| 2026-06-01 00:00 |
01:01:29.82 |
+05:03:05.4 |
HIP 4790 |
5.01 |
| 2026-06-01 12:00 |
01:01:44.29 |
+05:04:22.2 |
HIP 4790 |
4.81 |
| 2026-06-02 00:00 |
01:01:58.67 |
+05:05:38.3 |
HIP 4849 |
6.70 |