C/2007 M3 (LINEAR)
| Parameter |
Value |
| Designation |
C/2007 M3 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2007-09-04T15:02:43.900800Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:10Z |
| Obs used |
680 |
| NEO |
- |
| M1 |
10.000 |
| K1 |
8.750 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2007-08-18.0000000 |
| e |
0.97975971 |
| q (au) |
3.468759 |
| a (au) |
171.378889 |
| i (deg) |
161.760899 |
| Ω (om, deg) |
41.620749 |
| ω (w, deg) |
125.739479 |
| M (ma, deg) |
359.992256 |
Magnitude
Scatter + Global Linear
$$
M_a = (5.660 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
5.660 |
| 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
Residuals (Piecewise)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| Start (UTC) |
End (UTC) |
a |
b |
| 2006-11-12 |
2007-09-03 |
+12.7086 |
-6.767 |
| 2007-09-06 |
2008-07-01 |
+1.6882 |
-1.461 |
log10 r = log10(heliocentric distance / AU), Δ = geocentric distance (AU)
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
08:32:12.78 |
-00:29:56.5 |
HIP 41827 |
20.71 |
| 2026-02-03 12:00 |
08:32:09.17 |
-00:29:41.0 |
HIP 41827 |
20.12 |
| 2026-02-04 00:00 |
08:32:05.56 |
-00:29:25.3 |
HIP 41827 |
19.56 |
| 2026-02-04 12:00 |
08:32:01.95 |
-00:29:09.5 |
HIP 41827 |
19.02 |
| 2026-02-05 00:00 |
08:31:58.35 |
-00:28:53.5 |
HIP 41827 |
18.52 |
| 2026-02-05 12:00 |
08:31:54.76 |
-00:28:37.4 |
HIP 41827 |
18.05 |
| 2026-02-06 00:00 |
08:31:51.17 |
-00:28:21.2 |
HIP 41827 |
17.61 |
| 2026-02-06 12:00 |
08:31:47.59 |
-00:28:04.9 |
HIP 41827 |
17.22 |
| 2026-02-07 00:00 |
08:31:44.01 |
-00:27:48.4 |
HIP 41827 |
16.86 |
| 2026-02-07 12:00 |
08:31:40.45 |
-00:27:31.8 |
HIP 41827 |
16.55 |
| 2026-02-08 00:00 |
08:31:36.88 |
-00:27:15.1 |
HIP 41827 |
16.28 |
| 2026-02-08 12:00 |
08:31:33.33 |
-00:26:58.3 |
HIP 41827 |
16.06 |
| 2026-02-09 00:00 |
08:31:29.78 |
-00:26:41.3 |
HIP 41827 |
15.89 |
| 2026-02-09 12:00 |
08:31:26.25 |
-00:26:24.3 |
HIP 41827 |
15.77 |
| 2026-02-10 00:00 |
08:31:22.72 |
-00:26:07.1 |
HIP 41827 |
15.70 |
| 2026-02-10 12:00 |
08:31:19.19 |
-00:25:49.8 |
HIP 41827 |
15.69 |
| 2026-02-11 00:00 |
08:31:15.68 |
-00:25:32.4 |
HIP 41827 |
15.72 |
| 2026-02-11 12:00 |
08:31:12.18 |
-00:25:14.8 |
HIP 41827 |
15.81 |
| 2026-02-12 00:00 |
08:31:08.68 |
-00:24:57.2 |
HIP 41827 |
15.95 |
| 2026-02-12 12:00 |
08:31:05.19 |
-00:24:39.4 |
HIP 41827 |
16.14 |
| 2026-02-13 00:00 |
08:31:01.72 |
-00:24:21.6 |
HIP 41827 |
16.37 |
| 2026-02-13 12:00 |
08:30:58.25 |
-00:24:03.6 |
HIP 41827 |
16.65 |
| 2026-02-14 00:00 |
08:30:54.80 |
-00:23:45.5 |
HIP 41827 |
16.97 |
| 2026-02-14 12:00 |
08:30:51.35 |
-00:23:27.4 |
HIP 41827 |
17.33 |
| 2026-02-15 00:00 |
08:30:47.92 |
-00:23:09.1 |
HIP 41827 |
17.72 |
| 2026-02-15 12:00 |
08:30:44.50 |
-00:22:50.7 |
HIP 41827 |
18.15 |
| 2026-02-16 00:00 |
08:30:41.08 |
-00:22:32.2 |
HIP 41827 |
18.61 |
| 2026-02-16 12:00 |
08:30:37.68 |
-00:22:13.6 |
HIP 41827 |
19.10 |
| 2026-02-17 00:00 |
08:30:34.30 |
-00:21:55.0 |
HIP 41827 |
19.62 |
| 2026-02-17 12:00 |
08:30:30.92 |
-00:21:36.2 |
HIP 41827 |
20.16 |
| 2026-02-18 00:00 |
08:30:27.56 |
-00:21:17.3 |
HIP 41622 |
20.17 |
| 2026-02-18 12:00 |
08:30:24.21 |
-00:20:58.4 |
HIP 41622 |
19.29 |
| 2026-02-19 00:00 |
08:30:20.87 |
-00:20:39.3 |
HIP 41622 |
18.42 |
| 2026-02-19 12:00 |
08:30:17.55 |
-00:20:20.2 |
HIP 41622 |
17.55 |
| 2026-02-20 00:00 |
08:30:14.24 |
-00:20:01.0 |
HIP 41622 |
16.69 |
| 2026-02-20 12:00 |
08:30:10.94 |
-00:19:41.7 |
HIP 41622 |
15.83 |
| 2026-02-21 00:00 |
08:30:07.66 |
-00:19:22.3 |
HIP 41622 |
14.98 |
| 2026-02-21 12:00 |
08:30:04.39 |
-00:19:02.8 |
HIP 41622 |
14.14 |
| 2026-02-22 00:00 |
08:30:01.14 |
-00:18:43.3 |
HIP 41622 |
13.31 |
| 2026-02-22 12:00 |
08:29:57.90 |
-00:18:23.6 |
HIP 41622 |
12.49 |
| 2026-02-23 00:00 |
08:29:54.68 |
-00:18:03.9 |
HIP 41622 |
11.68 |
| 2026-02-23 12:00 |
08:29:51.47 |
-00:17:44.1 |
HIP 41622 |
10.88 |
| 2026-02-24 00:00 |
08:29:48.28 |
-00:17:24.3 |
HIP 41622 |
10.09 |