C/2007 Q1 (Garradd)
| Parameter |
Value |
| Designation |
C/2007 Q1 (Garradd) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2006-12-11T05:36:50.662080Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:11Z |
| Obs used |
45 |
| NEO |
- |
| M1 |
6.900 |
| K1 |
16.500 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2007-09-02.0000000 |
| e |
1.00098762 |
| q (au) |
2.989255 |
| a (au) |
-3026.729908 |
| i (deg) |
82.007598 |
| Ω (om, deg) |
5.894732 |
| ω (w, deg) |
282.133141 |
| M (ma, deg) |
0.001567 |
Magnitude
Scatter + Global Linear
$$
M_a = (7.386 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
7.386 |
| n |
6.000 |
| gf |
1.000 |
| 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) |
| 2026-02-03 00:00 |
21:46:43.64 |
+64:52:48.1 |
HIP 107648 |
19.93 |
| 2026-02-03 12:00 |
21:46:50.28 |
+64:52:45.1 |
HIP 107648 |
19.64 |
| 2026-02-04 00:00 |
21:46:56.94 |
+64:52:42.4 |
HIP 107648 |
19.37 |
| 2026-02-04 12:00 |
21:47:03.60 |
+64:52:40.1 |
HIP 107648 |
19.12 |
| 2026-02-05 00:00 |
21:47:10.27 |
+64:52:38.2 |
HIP 107648 |
18.88 |
| 2026-02-05 12:00 |
21:47:16.95 |
+64:52:36.7 |
HIP 107648 |
18.66 |
| 2026-02-06 00:00 |
21:47:23.64 |
+64:52:35.6 |
HIP 107648 |
18.46 |
| 2026-02-06 12:00 |
21:47:30.33 |
+64:52:34.9 |
HIP 107648 |
18.28 |
| 2026-02-07 00:00 |
21:47:37.03 |
+64:52:34.5 |
HIP 107648 |
18.11 |
| 2026-02-07 12:00 |
21:47:43.73 |
+64:52:34.6 |
HIP 107648 |
17.97 |
| 2026-02-08 00:00 |
21:47:50.44 |
+64:52:35.0 |
HIP 107648 |
17.85 |
| 2026-02-08 12:00 |
21:47:57.16 |
+64:52:35.8 |
HIP 107648 |
17.74 |
| 2026-02-09 00:00 |
21:48:03.88 |
+64:52:37.0 |
HIP 107648 |
17.66 |
| 2026-02-09 12:00 |
21:48:10.60 |
+64:52:38.6 |
HIP 107648 |
17.60 |
| 2026-02-10 00:00 |
21:48:17.32 |
+64:52:40.6 |
HIP 107648 |
17.56 |
| 2026-02-10 12:00 |
21:48:24.05 |
+64:52:43.0 |
HIP 107648 |
17.55 |
| 2026-02-11 00:00 |
21:48:30.79 |
+64:52:45.8 |
HIP 107648 |
17.56 |
| 2026-02-11 12:00 |
21:48:37.52 |
+64:52:48.9 |
HIP 107648 |
17.59 |
| 2026-02-12 00:00 |
21:48:44.26 |
+64:52:52.5 |
HIP 107648 |
17.64 |
| 2026-02-12 12:00 |
21:48:50.99 |
+64:52:56.4 |
HIP 107648 |
17.71 |
| 2026-02-13 00:00 |
21:48:57.73 |
+64:53:00.8 |
HIP 107648 |
17.81 |
| 2026-02-13 12:00 |
21:49:04.47 |
+64:53:05.5 |
HIP 107909 |
17.20 |
| 2026-02-14 00:00 |
21:49:11.21 |
+64:53:10.6 |
HIP 107909 |
16.49 |
| 2026-02-14 12:00 |
21:49:17.94 |
+64:53:16.1 |
HIP 107909 |
15.77 |
| 2026-02-15 00:00 |
21:49:24.68 |
+64:53:21.9 |
HIP 107909 |
15.05 |
| 2026-02-15 12:00 |
21:49:31.41 |
+64:53:28.2 |
HIP 107909 |
14.33 |
| 2026-02-16 00:00 |
21:49:38.14 |
+64:53:34.8 |
HIP 107909 |
13.61 |
| 2026-02-16 12:00 |
21:49:44.87 |
+64:53:41.9 |
HIP 107909 |
12.90 |
| 2026-02-17 00:00 |
21:49:51.60 |
+64:53:49.3 |
HIP 107909 |
12.18 |
| 2026-02-17 12:00 |
21:49:58.32 |
+64:53:57.1 |
HIP 107909 |
11.47 |
| 2026-02-18 00:00 |
21:50:05.04 |
+64:54:05.3 |
HIP 107909 |
10.75 |
| 2026-02-18 12:00 |
21:50:11.76 |
+64:54:13.9 |
HIP 107909 |
10.04 |
| 2026-02-19 00:00 |
21:50:18.47 |
+64:54:22.8 |
HIP 107909 |
9.34 |
| 2026-02-19 12:00 |
21:50:25.17 |
+64:54:32.2 |
HIP 107909 |
8.64 |
| 2026-02-20 00:00 |
21:50:31.87 |
+64:54:41.9 |
HIP 107909 |
7.94 |
| 2026-02-20 12:00 |
21:50:38.56 |
+64:54:52.0 |
HIP 107909 |
7.25 |
| 2026-02-21 00:00 |
21:50:45.24 |
+64:55:02.4 |
HIP 107909 |
6.58 |
| 2026-02-21 12:00 |
21:50:51.92 |
+64:55:13.3 |
HIP 107909 |
5.91 |
| 2026-02-22 00:00 |
21:50:58.59 |
+64:55:24.5 |
HIP 107909 |
5.27 |
| 2026-02-22 12:00 |
21:51:05.25 |
+64:55:36.1 |
HIP 107909 |
4.66 |
| 2026-02-23 00:00 |
21:51:11.90 |
+64:55:48.1 |
HIP 107909 |
4.10 |
| 2026-02-23 12:00 |
21:51:18.54 |
+64:56:00.5 |
HIP 107909 |
3.59 |
| 2026-02-24 00:00 |
21:51:25.18 |
+64:56:13.2 |
HIP 107909 |
3.19 |