| 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 |
-1.000 |
| 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) |
| 2026-05-12 00:00 |
05:25:44.80 |
-39:34:29.5 |
HIP 25194 |
27.81 |
| 2026-05-12 12:00 |
05:25:48.01 |
-39:34:09.9 |
HIP 25194 |
28.49 |
| 2026-05-13 00:00 |
05:25:51.23 |
-39:33:50.7 |
HIP 25194 |
29.17 |
| 2026-05-13 12:00 |
05:25:54.48 |
-39:33:31.7 |
HIP 25553 |
29.38 |
| 2026-05-14 00:00 |
05:25:57.73 |
-39:33:13.1 |
HIP 25553 |
28.71 |
| 2026-05-14 12:00 |
05:26:01.00 |
-39:32:54.7 |
HIP 25553 |
28.05 |
| 2026-05-15 00:00 |
05:26:04.29 |
-39:32:36.6 |
HIP 25553 |
27.38 |
| 2026-05-15 12:00 |
05:26:07.60 |
-39:32:18.9 |
HIP 25553 |
26.72 |
| 2026-05-16 00:00 |
05:26:10.91 |
-39:32:01.4 |
HIP 25553 |
26.07 |
| 2026-05-16 12:00 |
05:26:14.25 |
-39:31:44.3 |
HIP 25553 |
25.42 |
| 2026-05-17 00:00 |
05:26:17.60 |
-39:31:27.4 |
HIP 25553 |
24.77 |
| 2026-05-17 12:00 |
05:26:20.96 |
-39:31:10.9 |
HIP 25553 |
24.13 |
| 2026-05-18 00:00 |
05:26:24.33 |
-39:30:54.7 |
HIP 25553 |
23.49 |
| 2026-05-18 12:00 |
05:26:27.72 |
-39:30:38.8 |
HIP 25553 |
22.86 |
| 2026-05-19 00:00 |
05:26:31.13 |
-39:30:23.2 |
HIP 25553 |
22.24 |
| 2026-05-19 12:00 |
05:26:34.54 |
-39:30:07.9 |
HIP 25553 |
21.62 |
| 2026-05-20 00:00 |
05:26:37.97 |
-39:29:52.9 |
HIP 25553 |
21.01 |
| 2026-05-20 12:00 |
05:26:41.41 |
-39:29:38.2 |
HIP 25553 |
20.41 |
| 2026-05-21 00:00 |
05:26:44.87 |
-39:29:23.9 |
HIP 25553 |
19.83 |
| 2026-05-21 12:00 |
05:26:48.33 |
-39:29:09.9 |
HIP 25553 |
19.25 |
| 2026-05-22 00:00 |
05:26:51.81 |
-39:28:56.2 |
HIP 25553 |
18.68 |
| 2026-05-22 12:00 |
05:26:55.30 |
-39:28:42.8 |
HIP 25553 |
18.13 |
| 2026-05-23 00:00 |
05:26:58.80 |
-39:28:29.7 |
HIP 25553 |
17.60 |
| 2026-05-23 12:00 |
05:27:02.32 |
-39:28:16.9 |
HIP 25553 |
17.08 |
| 2026-05-24 00:00 |
05:27:05.84 |
-39:28:04.5 |
HIP 25553 |
16.58 |
| 2026-05-24 12:00 |
05:27:09.37 |
-39:27:52.4 |
HIP 25553 |
16.09 |
| 2026-05-25 00:00 |
05:27:12.91 |
-39:27:40.6 |
HIP 25627 |
15.48 |
| 2026-05-25 12:00 |
05:27:16.47 |
-39:27:29.1 |
HIP 25627 |
14.77 |
| 2026-05-26 00:00 |
05:27:20.03 |
-39:27:18.0 |
HIP 25627 |
14.06 |
| 2026-05-26 12:00 |
05:27:23.60 |
-39:27:07.1 |
HIP 25627 |
13.35 |
| 2026-05-27 00:00 |
05:27:27.19 |
-39:26:56.6 |
HIP 25627 |
12.65 |
| 2026-05-27 12:00 |
05:27:30.78 |
-39:26:46.4 |
HIP 25627 |
11.94 |
| 2026-05-28 00:00 |
05:27:34.38 |
-39:26:36.6 |
HIP 25627 |
11.23 |
| 2026-05-28 12:00 |
05:27:37.98 |
-39:26:27.0 |
HIP 25627 |
10.53 |
| 2026-05-29 00:00 |
05:27:41.60 |
-39:26:17.8 |
HIP 25627 |
9.83 |
| 2026-05-29 12:00 |
05:27:45.23 |
-39:26:09.0 |
HIP 25627 |
9.13 |
| 2026-05-30 00:00 |
05:27:48.86 |
-39:26:00.4 |
HIP 25627 |
8.44 |
| 2026-05-30 12:00 |
05:27:52.50 |
-39:25:52.2 |
HIP 25627 |
7.75 |
| 2026-05-31 00:00 |
05:27:56.14 |
-39:25:44.3 |
HIP 25627 |
7.07 |
| 2026-05-31 12:00 |
05:27:59.80 |
-39:25:36.7 |
HIP 25627 |
6.40 |
| 2026-06-01 00:00 |
05:28:03.46 |
-39:25:29.5 |
HIP 25627 |
5.74 |
| 2026-06-01 12:00 |
05:28:07.13 |
-39:25:22.5 |
HIP 25627 |
5.10 |
| 2026-06-02 00:00 |
05:28:10.80 |
-39:25:16.0 |
HIP 25627 |
4.48 |