| 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
$$
M_a = (8.995 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
8.995 |
| n |
6.000 |
| gf |
0.958 |
| gb |
-0.767 |
| k |
0.914 |
| 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) |
| 2026-06-01 00:00 |
08:24:59.29 |
-10:15:40.0 |
HIP 41205 |
15.57 |
| 2026-06-01 12:00 |
08:25:00.82 |
-10:15:26.7 |
HIP 41205 |
15.54 |
| 2026-06-02 00:00 |
08:25:02.37 |
-10:15:13.5 |
HIP 41205 |
15.53 |
| 2026-06-02 12:00 |
08:25:03.93 |
-10:15:00.5 |
HIP 41205 |
15.54 |
| 2026-06-03 00:00 |
08:25:05.52 |
-10:14:47.7 |
HIP 41205 |
15.57 |
| 2026-06-03 12:00 |
08:25:07.12 |
-10:14:35.1 |
HIP 41205 |
15.61 |
| 2026-06-04 00:00 |
08:25:08.75 |
-10:14:22.7 |
HIP 41205 |
15.67 |
| 2026-06-04 12:00 |
08:25:10.39 |
-10:14:10.4 |
HIP 41205 |
15.75 |
| 2026-06-05 00:00 |
08:25:12.06 |
-10:13:58.4 |
HIP 41205 |
15.85 |
| 2026-06-05 12:00 |
08:25:13.74 |
-10:13:46.5 |
HIP 41205 |
15.97 |
| 2026-06-06 00:00 |
08:25:15.44 |
-10:13:34.9 |
HIP 41205 |
16.10 |
| 2026-06-06 12:00 |
08:25:17.16 |
-10:13:23.4 |
HIP 41205 |
16.25 |
| 2026-06-07 00:00 |
08:25:18.90 |
-10:13:12.1 |
HIP 41205 |
16.42 |
| 2026-06-07 12:00 |
08:25:20.66 |
-10:13:01.0 |
HIP 41205 |
16.61 |
| 2026-06-08 00:00 |
08:25:22.43 |
-10:12:50.1 |
HIP 41205 |
16.81 |
| 2026-06-08 12:00 |
08:25:24.23 |
-10:12:39.4 |
HIP 41205 |
17.03 |
| 2026-06-09 00:00 |
08:25:26.04 |
-10:12:28.9 |
HIP 41205 |
17.26 |
| 2026-06-09 12:00 |
08:25:27.87 |
-10:12:18.5 |
HIP 41205 |
17.51 |
| 2026-06-10 00:00 |
08:25:29.71 |
-10:12:08.4 |
HIP 41205 |
17.78 |
| 2026-06-10 12:00 |
08:25:31.58 |
-10:11:58.5 |
HIP 41205 |
18.06 |
| 2026-06-11 00:00 |
08:25:33.46 |
-10:11:48.7 |
HIP 41205 |
18.35 |
| 2026-06-11 12:00 |
08:25:35.36 |
-10:11:39.2 |
HIP 41205 |
18.66 |
| 2026-06-12 00:00 |
08:25:37.28 |
-10:11:29.8 |
HIP 41205 |
18.98 |
| 2026-06-12 12:00 |
08:25:39.21 |
-10:11:20.7 |
HIP 41205 |
19.31 |
| 2026-06-13 00:00 |
08:25:41.16 |
-10:11:11.7 |
HIP 41205 |
19.65 |
| 2026-06-13 12:00 |
08:25:43.13 |
-10:11:03.0 |
HIP 41205 |
20.01 |
| 2026-06-14 00:00 |
08:25:45.11 |
-10:10:54.4 |
HIP 41205 |
20.38 |
| 2026-06-14 12:00 |
08:25:47.11 |
-10:10:46.1 |
HIP 41336 |
20.52 |
| 2026-06-15 00:00 |
08:25:49.12 |
-10:10:37.9 |
HIP 41336 |
20.57 |
| 2026-06-15 12:00 |
08:25:51.16 |
-10:10:29.9 |
HIP 41336 |
20.64 |
| 2026-06-16 00:00 |
08:25:53.20 |
-10:10:22.2 |
HIP 41336 |
20.72 |
| 2026-06-16 12:00 |
08:25:55.26 |
-10:10:14.6 |
HIP 41336 |
20.80 |
| 2026-06-17 00:00 |
08:25:57.34 |
-10:10:07.3 |
HIP 41336 |
20.89 |
| 2026-06-17 12:00 |
08:25:59.44 |
-10:10:00.1 |
HIP 41336 |
21.00 |
| 2026-06-18 00:00 |
08:26:01.54 |
-10:09:53.2 |
HIP 41336 |
21.11 |
| 2026-06-18 12:00 |
08:26:03.67 |
-10:09:46.4 |
HIP 41336 |
21.23 |
| 2026-06-19 00:00 |
08:26:05.80 |
-10:09:39.9 |
HIP 41336 |
21.36 |
| 2026-06-19 12:00 |
08:26:07.96 |
-10:09:33.6 |
HIP 41336 |
21.50 |
| 2026-06-20 00:00 |
08:26:10.12 |
-10:09:27.4 |
HIP 41336 |
21.65 |
| 2026-06-20 12:00 |
08:26:12.30 |
-10:09:21.5 |
HIP 41336 |
21.81 |
| 2026-06-21 00:00 |
08:26:14.49 |
-10:09:15.8 |
HIP 41336 |
21.98 |
| 2026-06-21 12:00 |
08:26:16.70 |
-10:09:10.2 |
HIP 41336 |
22.16 |
| 2026-06-22 00:00 |
08:26:18.92 |
-10:09:04.9 |
HIP 41336 |
22.35 |