| 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) |
| 2026-07-29 00:00 |
08:31:42.22 |
+00:34:56.9 |
HIP 41761 |
14.02 |
| 2026-07-29 12:00 |
08:31:45.07 |
+00:34:46.6 |
HIP 41761 |
14.71 |
| 2026-07-30 00:00 |
08:31:47.92 |
+00:34:36.1 |
HIP 41761 |
15.40 |
| 2026-07-30 12:00 |
08:31:50.77 |
+00:34:25.5 |
HIP 41761 |
16.09 |
| 2026-07-31 00:00 |
08:31:53.61 |
+00:34:14.8 |
HIP 41761 |
16.79 |
| 2026-07-31 12:00 |
08:31:56.46 |
+00:34:03.9 |
HIP 41761 |
17.49 |
| 2026-08-01 00:00 |
08:31:59.30 |
+00:33:53.0 |
HIP 41761 |
18.19 |
| 2026-08-01 12:00 |
08:32:02.14 |
+00:33:41.9 |
HIP 41761 |
18.90 |
| 2026-08-02 00:00 |
08:32:04.98 |
+00:33:30.7 |
HIP 41761 |
19.61 |
| 2026-08-02 12:00 |
08:32:07.82 |
+00:33:19.4 |
HIP 41761 |
20.32 |
| 2026-08-03 00:00 |
08:32:10.66 |
+00:33:07.9 |
HIP 41761 |
21.04 |
| 2026-08-03 12:00 |
08:32:13.49 |
+00:32:56.4 |
HIP 41761 |
21.75 |
| 2026-08-04 00:00 |
08:32:16.33 |
+00:32:44.7 |
HIP 41761 |
22.47 |
| 2026-08-04 12:00 |
08:32:19.16 |
+00:32:32.9 |
HIP 41761 |
23.19 |
| 2026-08-05 00:00 |
08:32:21.98 |
+00:32:21.0 |
HIP 41761 |
23.91 |
| 2026-08-05 12:00 |
08:32:24.81 |
+00:32:09.0 |
HIP 41761 |
24.63 |
| 2026-08-06 00:00 |
08:32:27.63 |
+00:31:56.8 |
HIP 41761 |
25.35 |
| 2026-08-06 12:00 |
08:32:30.44 |
+00:31:44.6 |
HIP 41761 |
26.07 |
| 2026-08-07 00:00 |
08:32:33.26 |
+00:31:32.2 |
HIP 41761 |
26.80 |
| 2026-08-07 12:00 |
08:32:36.06 |
+00:31:19.7 |
HIP 41761 |
27.52 |
| 2026-08-08 00:00 |
08:32:38.87 |
+00:31:07.1 |
HIP 41761 |
28.24 |
| 2026-08-08 12:00 |
08:32:41.67 |
+00:30:54.4 |
HIP 41761 |
28.97 |
| 2026-08-09 00:00 |
08:32:44.47 |
+00:30:41.6 |
HIP 41761 |
29.69 |
| 2026-08-09 12:00 |
08:32:47.26 |
+00:30:28.7 |
HIP 41761 |
30.42 |
| 2026-08-10 00:00 |
08:32:50.05 |
+00:30:15.7 |
HIP 41761 |
31.14 |
| 2026-08-10 12:00 |
08:32:52.83 |
+00:30:02.6 |
HIP 42094 |
31.52 |
| 2026-08-11 00:00 |
08:32:55.60 |
+00:29:49.3 |
HIP 42094 |
30.80 |
| 2026-08-11 12:00 |
08:32:58.37 |
+00:29:36.0 |
HIP 42094 |
30.07 |
| 2026-08-12 00:00 |
08:33:01.14 |
+00:29:22.5 |
HIP 42094 |
29.35 |
| 2026-08-12 12:00 |
08:33:03.90 |
+00:29:09.0 |
HIP 42094 |
28.63 |
| 2026-08-13 00:00 |
08:33:06.65 |
+00:28:55.3 |
HIP 42094 |
27.92 |
| 2026-08-13 12:00 |
08:33:09.40 |
+00:28:41.6 |
HIP 42094 |
27.20 |
| 2026-08-14 00:00 |
08:33:12.14 |
+00:28:27.7 |
HIP 42094 |
26.48 |
| 2026-08-14 12:00 |
08:33:14.87 |
+00:28:13.8 |
HIP 42094 |
25.77 |
| 2026-08-15 00:00 |
08:33:17.60 |
+00:27:59.7 |
HIP 42094 |
25.05 |
| 2026-08-15 12:00 |
08:33:20.31 |
+00:27:45.6 |
HIP 42094 |
24.34 |
| 2026-08-16 00:00 |
08:33:23.03 |
+00:27:31.4 |
HIP 42094 |
23.63 |
| 2026-08-16 12:00 |
08:33:25.73 |
+00:27:17.0 |
HIP 42094 |
22.92 |
| 2026-08-17 00:00 |
08:33:28.42 |
+00:27:02.6 |
HIP 42094 |
22.21 |
| 2026-08-17 12:00 |
08:33:31.11 |
+00:26:48.1 |
HIP 42094 |
21.51 |
| 2026-08-18 00:00 |
08:33:33.79 |
+00:26:33.5 |
HIP 42094 |
20.80 |
| 2026-08-18 12:00 |
08:33:36.46 |
+00:26:18.8 |
HIP 42094 |
20.10 |
| 2026-08-19 00:00 |
08:33:39.12 |
+00:26:04.0 |
HIP 42094 |
19.40 |