| Parameter |
Value |
| Designation |
C/2005 G1 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2006-02-27T06:21:42.981120Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:48Z |
| Obs used |
287 |
| NEO |
- |
| M1 |
7.500 |
| K1 |
10.250 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2005-08-17.0000000 |
| e |
0.99973621 |
| q (au) |
4.960798 |
| a (au) |
18805.663709 |
| i (deg) |
108.413949 |
| Ω (om, deg) |
299.589019 |
| ω (w, deg) |
113.810280 |
| M (ma, deg) |
359.999926 |
Magnitude
Scatter + Global Linear
$$
M_a = (4.167 + 5.406\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
4.167 |
| n |
5.406 |
| gf |
0.997 |
| gb |
-0.500 |
| k |
1.000 |
| 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 |
05:34:47.68 |
-39:48:48.3 |
HIP 25935 |
34.12 |
| 2026-07-29 12:00 |
05:34:50.42 |
-39:49:18.3 |
HIP 25935 |
34.39 |
| 2026-07-30 00:00 |
05:34:53.14 |
-39:49:48.5 |
HIP 25935 |
34.68 |
| 2026-07-30 12:00 |
05:34:55.84 |
-39:50:19.1 |
HIP 26478 |
34.21 |
| 2026-07-31 00:00 |
05:34:58.52 |
-39:50:49.8 |
HIP 26478 |
33.73 |
| 2026-07-31 12:00 |
05:35:01.17 |
-39:51:20.9 |
HIP 26478 |
33.27 |
| 2026-08-01 00:00 |
05:35:03.81 |
-39:51:52.2 |
HIP 26478 |
32.82 |
| 2026-08-01 12:00 |
05:35:06.42 |
-39:52:23.7 |
HIP 26478 |
32.38 |
| 2026-08-02 00:00 |
05:35:09.00 |
-39:52:55.5 |
HIP 26478 |
31.96 |
| 2026-08-02 12:00 |
05:35:11.57 |
-39:53:27.6 |
HIP 26478 |
31.56 |
| 2026-08-03 00:00 |
05:35:14.11 |
-39:53:59.9 |
HIP 26478 |
31.18 |
| 2026-08-03 12:00 |
05:35:16.62 |
-39:54:32.4 |
HIP 26478 |
30.81 |
| 2026-08-04 00:00 |
05:35:19.12 |
-39:55:05.2 |
HIP 26478 |
30.46 |
| 2026-08-04 12:00 |
05:35:21.59 |
-39:55:38.2 |
HIP 26478 |
30.13 |
| 2026-08-05 00:00 |
05:35:24.03 |
-39:56:11.5 |
HIP 26478 |
29.81 |
| 2026-08-05 12:00 |
05:35:26.46 |
-39:56:45.0 |
HIP 26478 |
29.52 |
| 2026-08-06 00:00 |
05:35:28.85 |
-39:57:18.7 |
HIP 26478 |
29.25 |
| 2026-08-06 12:00 |
05:35:31.23 |
-39:57:52.7 |
HIP 26478 |
29.01 |
| 2026-08-07 00:00 |
05:35:33.58 |
-39:58:26.9 |
HIP 26478 |
28.78 |
| 2026-08-07 12:00 |
05:35:35.90 |
-39:59:01.4 |
HIP 26478 |
28.57 |
| 2026-08-08 00:00 |
05:35:38.20 |
-39:59:36.1 |
HIP 26478 |
28.39 |
| 2026-08-08 12:00 |
05:35:40.47 |
-40:00:11.0 |
HIP 26478 |
28.24 |
| 2026-08-09 00:00 |
05:35:42.72 |
-40:00:46.1 |
HIP 26478 |
28.11 |
| 2026-08-09 12:00 |
05:35:44.94 |
-40:01:21.5 |
HIP 26478 |
28.00 |
| 2026-08-10 00:00 |
05:35:47.13 |
-40:01:57.0 |
HIP 26478 |
27.91 |
| 2026-08-10 12:00 |
05:35:49.30 |
-40:02:32.9 |
HIP 26478 |
27.86 |
| 2026-08-11 00:00 |
05:35:51.44 |
-40:03:08.9 |
HIP 26478 |
27.82 |
| 2026-08-11 12:00 |
05:35:53.56 |
-40:03:45.1 |
HIP 26478 |
27.81 |
| 2026-08-12 00:00 |
05:35:55.65 |
-40:04:21.6 |
HIP 26478 |
27.83 |
| 2026-08-12 12:00 |
05:35:57.71 |
-40:04:58.2 |
HIP 26478 |
27.88 |
| 2026-08-13 00:00 |
05:35:59.74 |
-40:05:35.1 |
HIP 26478 |
27.94 |
| 2026-08-13 12:00 |
05:36:01.75 |
-40:06:12.2 |
HIP 26478 |
28.04 |
| 2026-08-14 00:00 |
05:36:03.73 |
-40:06:49.5 |
HIP 26478 |
28.16 |
| 2026-08-14 12:00 |
05:36:05.68 |
-40:07:26.9 |
HIP 26478 |
28.30 |
| 2026-08-15 00:00 |
05:36:07.60 |
-40:08:04.6 |
HIP 26478 |
28.47 |
| 2026-08-15 12:00 |
05:36:09.50 |
-40:08:42.5 |
HIP 26478 |
28.66 |
| 2026-08-16 00:00 |
05:36:11.36 |
-40:09:20.6 |
HIP 26478 |
28.87 |
| 2026-08-16 12:00 |
05:36:13.20 |
-40:09:58.9 |
HIP 26478 |
29.11 |
| 2026-08-17 00:00 |
05:36:15.01 |
-40:10:37.3 |
HIP 26193 |
29.31 |
| 2026-08-17 12:00 |
05:36:16.79 |
-40:11:16.0 |
HIP 26193 |
28.92 |
| 2026-08-18 00:00 |
05:36:18.54 |
-40:11:54.8 |
HIP 26193 |
28.54 |
| 2026-08-18 12:00 |
05:36:20.26 |
-40:12:33.8 |
HIP 26193 |
28.17 |
| 2026-08-19 00:00 |
05:36:21.96 |
-40:13:13.0 |
HIP 26193 |
27.80 |