| 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) |
| 2026-05-12 00:00 |
08:26:14.35 |
+00:31:50.7 |
HIP 41345 |
18.13 |
| 2026-05-12 12:00 |
08:26:15.02 |
+00:32:03.7 |
HIP 41345 |
18.36 |
| 2026-05-13 00:00 |
08:26:15.72 |
+00:32:16.5 |
HIP 41345 |
18.59 |
| 2026-05-13 12:00 |
08:26:16.44 |
+00:32:29.1 |
HIP 41345 |
18.83 |
| 2026-05-14 00:00 |
08:26:17.19 |
+00:32:41.7 |
HIP 41345 |
19.06 |
| 2026-05-14 12:00 |
08:26:17.97 |
+00:32:54.1 |
HIP 41345 |
19.29 |
| 2026-05-15 00:00 |
08:26:18.77 |
+00:33:06.3 |
HIP 41345 |
19.52 |
| 2026-05-15 12:00 |
08:26:19.59 |
+00:33:18.4 |
HIP 41345 |
19.75 |
| 2026-05-16 00:00 |
08:26:20.44 |
+00:33:30.4 |
HIP 41345 |
19.98 |
| 2026-05-16 12:00 |
08:26:21.32 |
+00:33:42.2 |
HIP 41345 |
20.21 |
| 2026-05-17 00:00 |
08:26:22.22 |
+00:33:53.9 |
HIP 41345 |
20.45 |
| 2026-05-17 12:00 |
08:26:23.14 |
+00:34:05.4 |
HIP 41345 |
20.68 |
| 2026-05-18 00:00 |
08:26:24.09 |
+00:34:16.8 |
HIP 41345 |
20.91 |
| 2026-05-18 12:00 |
08:26:25.07 |
+00:34:28.1 |
HIP 41345 |
21.15 |
| 2026-05-19 00:00 |
08:26:26.06 |
+00:34:39.2 |
HIP 41345 |
21.38 |
| 2026-05-19 12:00 |
08:26:27.09 |
+00:34:50.2 |
HIP 41345 |
21.62 |
| 2026-05-20 00:00 |
08:26:28.13 |
+00:35:01.0 |
HIP 41471 |
21.60 |
| 2026-05-20 12:00 |
08:26:29.21 |
+00:35:11.6 |
HIP 41471 |
21.28 |
| 2026-05-21 00:00 |
08:26:30.30 |
+00:35:22.2 |
HIP 41471 |
20.96 |
| 2026-05-21 12:00 |
08:26:31.42 |
+00:35:32.5 |
HIP 41471 |
20.64 |
| 2026-05-22 00:00 |
08:26:32.56 |
+00:35:42.8 |
HIP 41471 |
20.31 |
| 2026-05-22 12:00 |
08:26:33.73 |
+00:35:52.8 |
HIP 41471 |
19.98 |
| 2026-05-23 00:00 |
08:26:34.92 |
+00:36:02.8 |
HIP 41471 |
19.66 |
| 2026-05-23 12:00 |
08:26:36.13 |
+00:36:12.5 |
HIP 41471 |
19.32 |
| 2026-05-24 00:00 |
08:26:37.37 |
+00:36:22.2 |
HIP 41471 |
18.99 |
| 2026-05-24 12:00 |
08:26:38.63 |
+00:36:31.7 |
HIP 41471 |
18.66 |
| 2026-05-25 00:00 |
08:26:39.91 |
+00:36:41.0 |
HIP 41471 |
18.32 |
| 2026-05-25 12:00 |
08:26:41.21 |
+00:36:50.2 |
HIP 41471 |
17.98 |
| 2026-05-26 00:00 |
08:26:42.54 |
+00:36:59.2 |
HIP 41471 |
17.64 |
| 2026-05-26 12:00 |
08:26:43.89 |
+00:37:08.1 |
HIP 41471 |
17.30 |
| 2026-05-27 00:00 |
08:26:45.26 |
+00:37:16.8 |
HIP 41471 |
16.96 |
| 2026-05-27 12:00 |
08:26:46.65 |
+00:37:25.4 |
HIP 41471 |
16.62 |
| 2026-05-28 00:00 |
08:26:48.07 |
+00:37:33.8 |
HIP 41471 |
16.28 |
| 2026-05-28 12:00 |
08:26:49.50 |
+00:37:42.0 |
HIP 41471 |
15.94 |
| 2026-05-29 00:00 |
08:26:50.96 |
+00:37:50.2 |
HIP 41471 |
15.60 |
| 2026-05-29 12:00 |
08:26:52.44 |
+00:37:58.1 |
HIP 41471 |
15.26 |
| 2026-05-30 00:00 |
08:26:53.95 |
+00:38:05.9 |
HIP 41471 |
14.92 |
| 2026-05-30 12:00 |
08:26:55.47 |
+00:38:13.6 |
HIP 41471 |
14.58 |
| 2026-05-31 00:00 |
08:26:57.01 |
+00:38:21.1 |
HIP 41471 |
14.25 |
| 2026-05-31 12:00 |
08:26:58.58 |
+00:38:28.4 |
HIP 41471 |
13.92 |
| 2026-06-01 00:00 |
08:27:00.17 |
+00:38:35.6 |
HIP 41471 |
13.59 |
| 2026-06-01 12:00 |
08:27:01.77 |
+00:38:42.7 |
HIP 41471 |
13.26 |
| 2026-06-02 00:00 |
08:27:03.40 |
+00:38:49.6 |
HIP 41471 |
12.94 |