C/2006 M2 (Spacewatch)
| Parameter |
Value |
| Designation |
C/2006 M2 (Spacewatch) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2005-12-31T16:30:25.462080Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:58Z |
| Obs used |
39 |
| NEO |
- |
| M1 |
- |
| K1 |
- |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2006-06-21.0000000 |
| e |
1.00240603 |
| q (au) |
5.313061 |
| a (au) |
-2208.224277 |
| i (deg) |
150.152651 |
| Ω (om, deg) |
27.284430 |
| ω (w, deg) |
120.496862 |
| M (ma, deg) |
0.001627 |
Magnitude
Scatter + Global Linear
$$
M_a = (7.964 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
7.964 |
| n |
6.000 |
| gf |
0.949 |
| gb |
-0.773 |
| k |
0.971 |
| δ90 |
9.981 |
| 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 |
08:30:08.09 |
-11:43:41.5 |
HIP 41747 |
10.34 |
| 2026-02-03 12:00 |
08:30:04.55 |
-11:43:26.8 |
HIP 41747 |
11.23 |
| 2026-02-04 00:00 |
08:30:01.02 |
-11:43:11.8 |
HIP 41747 |
12.13 |
| 2026-02-04 12:00 |
08:29:57.49 |
-11:42:56.7 |
HIP 41747 |
13.02 |
| 2026-02-05 00:00 |
08:29:53.97 |
-11:42:41.4 |
HIP 41747 |
13.91 |
| 2026-02-05 12:00 |
08:29:50.45 |
-11:42:25.9 |
HIP 41747 |
14.81 |
| 2026-02-06 00:00 |
08:29:46.94 |
-11:42:10.2 |
HIP 41747 |
15.70 |
| 2026-02-06 12:00 |
08:29:43.44 |
-11:41:54.2 |
HIP 41747 |
16.60 |
| 2026-02-07 00:00 |
08:29:39.94 |
-11:41:38.1 |
HIP 41747 |
17.49 |
| 2026-02-07 12:00 |
08:29:36.45 |
-11:41:21.8 |
HIP 41747 |
18.39 |
| 2026-02-08 00:00 |
08:29:32.97 |
-11:41:05.3 |
HIP 41747 |
19.28 |
| 2026-02-08 12:00 |
08:29:29.49 |
-11:40:48.6 |
HIP 41747 |
20.18 |
| 2026-02-09 00:00 |
08:29:26.02 |
-11:40:31.7 |
HIP 41747 |
21.07 |
| 2026-02-09 12:00 |
08:29:22.56 |
-11:40:14.6 |
HIP 41747 |
21.96 |
| 2026-02-10 00:00 |
08:29:19.11 |
-11:39:57.3 |
HIP 41747 |
22.86 |
| 2026-02-10 12:00 |
08:29:15.67 |
-11:39:39.9 |
HIP 41747 |
23.75 |
| 2026-02-11 00:00 |
08:29:12.23 |
-11:39:22.2 |
HIP 41747 |
24.64 |
| 2026-02-11 12:00 |
08:29:08.80 |
-11:39:04.4 |
HIP 41747 |
25.53 |
| 2026-02-12 00:00 |
08:29:05.39 |
-11:38:46.3 |
HIP 41747 |
26.42 |
| 2026-02-12 12:00 |
08:29:01.98 |
-11:38:28.1 |
HIP 41747 |
27.31 |
| 2026-02-13 00:00 |
08:28:58.58 |
-11:38:09.8 |
HIP 41747 |
28.19 |
| 2026-02-13 12:00 |
08:28:55.19 |
-11:37:51.2 |
HIP 41747 |
29.08 |
| 2026-02-14 00:00 |
08:28:51.81 |
-11:37:32.4 |
HIP 41747 |
29.96 |
| 2026-02-14 12:00 |
08:28:48.45 |
-11:37:13.5 |
HIP 41747 |
30.84 |
| 2026-02-15 00:00 |
08:28:45.09 |
-11:36:54.4 |
HIP 41747 |
31.73 |
| 2026-02-15 12:00 |
08:28:41.74 |
-11:36:35.1 |
HIP 41393 |
31.25 |
| 2026-02-16 00:00 |
08:28:38.41 |
-11:36:15.7 |
HIP 41393 |
30.58 |
| 2026-02-16 12:00 |
08:28:35.09 |
-11:35:56.1 |
HIP 41393 |
29.93 |
| 2026-02-17 00:00 |
08:28:31.77 |
-11:35:36.3 |
HIP 41393 |
29.30 |
| 2026-02-17 12:00 |
08:28:28.47 |
-11:35:16.4 |
HIP 41393 |
28.68 |
| 2026-02-18 00:00 |
08:28:25.19 |
-11:34:56.2 |
HIP 41393 |
28.07 |
| 2026-02-18 12:00 |
08:28:21.91 |
-11:34:36.0 |
HIP 41393 |
27.49 |
| 2026-02-19 00:00 |
08:28:18.65 |
-11:34:15.5 |
HIP 41393 |
26.92 |
| 2026-02-19 12:00 |
08:28:15.40 |
-11:33:54.9 |
HIP 41393 |
26.38 |
| 2026-02-20 00:00 |
08:28:12.17 |
-11:33:34.2 |
HIP 41393 |
25.86 |
| 2026-02-20 12:00 |
08:28:08.95 |
-11:33:13.3 |
HIP 41393 |
25.36 |
| 2026-02-21 00:00 |
08:28:05.74 |
-11:32:52.2 |
HIP 41393 |
24.88 |
| 2026-02-21 12:00 |
08:28:02.55 |
-11:32:31.0 |
HIP 41393 |
24.43 |
| 2026-02-22 00:00 |
08:27:59.37 |
-11:32:09.7 |
HIP 41393 |
24.01 |
| 2026-02-22 12:00 |
08:27:56.20 |
-11:31:48.1 |
HIP 41393 |
23.61 |
| 2026-02-23 00:00 |
08:27:53.05 |
-11:31:26.5 |
HIP 41393 |
23.25 |
| 2026-02-23 12:00 |
08:27:49.92 |
-11:31:04.7 |
HIP 41393 |
22.91 |
| 2026-02-24 00:00 |
08:27:46.80 |
-11:30:42.8 |
HIP 41393 |
22.60 |