| Parameter |
Value |
| Designation |
C/2012 F1 (Gibbs) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2012-02-19T02:09:39.654720Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:05Z |
| Obs used |
83 |
| NEO |
- |
| M1 |
13.800 |
| K1 |
10.000 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2012-03-22.0000000 |
| e |
0.96570670 |
| q (au) |
2.550934 |
| a (au) |
74.385762 |
| i (deg) |
159.396833 |
| Ω (om, deg) |
129.965498 |
| ω (w, deg) |
300.425399 |
| M (ma, deg) |
0.049023 |
Magnitude
Scatter + Global Linear
$$
M_a = (15.982 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
15.982 |
| n |
2.000 |
| gf |
0.801 |
| gb |
-0.500 |
| k |
0.899 |
| δ90 |
1.000 |
| 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 |
02:05:17.49 |
+35:01:26.3 |
HIP 9873 |
29.23 |
| 2026-09-20 12:00 |
02:05:13.31 |
+35:01:22.3 |
HIP 9873 |
29.89 |
| 2026-09-21 00:00 |
02:05:09.10 |
+35:01:18.1 |
HIP 9873 |
30.57 |
| 2026-09-21 12:00 |
02:05:04.87 |
+35:01:13.6 |
HIP 9873 |
31.27 |
| 2026-09-22 00:00 |
02:05:00.62 |
+35:01:08.9 |
HIP 9873 |
31.98 |
| 2026-09-22 12:00 |
02:04:56.34 |
+35:01:03.8 |
HIP 9873 |
32.71 |
| 2026-09-23 00:00 |
02:04:52.04 |
+35:00:58.6 |
HIP 9873 |
33.45 |
| 2026-09-23 12:00 |
02:04:47.72 |
+35:00:53.0 |
HIP 9873 |
34.20 |
| 2026-09-24 00:00 |
02:04:43.37 |
+35:00:47.2 |
HIP 9873 |
34.97 |
| 2026-09-24 12:00 |
02:04:39.00 |
+35:00:41.1 |
HIP 9873 |
35.75 |
| 2026-09-25 00:00 |
02:04:34.61 |
+35:00:34.7 |
HIP 9630 |
36.22 |
| 2026-09-25 12:00 |
02:04:30.20 |
+35:00:28.1 |
HIP 9630 |
36.10 |
| 2026-09-26 00:00 |
02:04:25.77 |
+35:00:21.2 |
HIP 9630 |
36.00 |
| 2026-09-26 12:00 |
02:04:21.31 |
+35:00:14.1 |
HIP 9630 |
35.93 |
| 2026-09-27 00:00 |
02:04:16.84 |
+35:00:06.6 |
HIP 9630 |
35.88 |
| 2026-09-27 12:00 |
02:04:12.34 |
+34:59:59.0 |
HIP 9630 |
35.87 |
| 2026-09-28 00:00 |
02:04:07.82 |
+34:59:51.0 |
HIP 9630 |
35.88 |
| 2026-09-28 12:00 |
02:04:03.29 |
+34:59:42.8 |
HIP 9630 |
35.92 |
| 2026-09-29 00:00 |
02:03:58.73 |
+34:59:34.3 |
HIP 9630 |
35.99 |
| 2026-09-29 12:00 |
02:03:54.15 |
+34:59:25.5 |
HIP 9630 |
36.08 |
| 2026-09-30 00:00 |
02:03:49.56 |
+34:59:16.5 |
HIP 9630 |
36.21 |
| 2026-09-30 12:00 |
02:03:44.95 |
+34:59:07.2 |
HIP 9630 |
36.36 |
| 2026-10-01 00:00 |
02:03:40.31 |
+34:58:57.6 |
HIP 9630 |
36.55 |
| 2026-10-01 12:00 |
02:03:35.66 |
+34:58:47.8 |
HIP 9426 |
36.48 |
| 2026-10-02 00:00 |
02:03:31.00 |
+34:58:37.7 |
HIP 9426 |
35.77 |
| 2026-10-02 12:00 |
02:03:26.31 |
+34:58:27.4 |
HIP 9426 |
35.07 |
| 2026-10-03 00:00 |
02:03:21.61 |
+34:58:16.7 |
HIP 9426 |
34.39 |
| 2026-10-03 12:00 |
02:03:16.89 |
+34:58:05.8 |
HIP 9426 |
33.72 |
| 2026-10-04 00:00 |
02:03:12.15 |
+34:57:54.7 |
HIP 9426 |
33.07 |
| 2026-10-04 12:00 |
02:03:07.40 |
+34:57:43.3 |
HIP 9426 |
32.43 |
| 2026-10-05 00:00 |
02:03:02.63 |
+34:57:31.6 |
HIP 9426 |
31.81 |
| 2026-10-05 12:00 |
02:02:57.85 |
+34:57:19.6 |
HIP 9426 |
31.21 |
| 2026-10-06 00:00 |
02:02:53.05 |
+34:57:07.4 |
HIP 9426 |
30.64 |
| 2026-10-06 12:00 |
02:02:48.24 |
+34:56:55.0 |
HIP 9426 |
30.09 |
| 2026-10-07 00:00 |
02:02:43.41 |
+34:56:42.2 |
HIP 9426 |
29.56 |
| 2026-10-07 12:00 |
02:02:38.57 |
+34:56:29.2 |
HIP 9426 |
29.06 |
| 2026-10-08 00:00 |
02:02:33.72 |
+34:56:16.0 |
HIP 9426 |
28.58 |
| 2026-10-08 12:00 |
02:02:28.85 |
+34:56:02.4 |
HIP 9426 |
28.14 |
| 2026-10-09 00:00 |
02:02:23.97 |
+34:55:48.7 |
HIP 9421 |
27.72 |
| 2026-10-09 12:00 |
02:02:19.08 |
+34:55:34.6 |
HIP 9421 |
27.33 |
| 2026-10-10 00:00 |
02:02:14.17 |
+34:55:20.3 |
HIP 9421 |
26.97 |
| 2026-10-10 12:00 |
02:02:09.26 |
+34:55:05.8 |
HIP 9421 |
26.64 |
| 2026-10-11 00:00 |
02:02:04.33 |
+34:54:50.9 |
HIP 9421 |
26.36 |