C/2011 M1 (LINEAR)
| Parameter |
Value |
| Designation |
C/2011 M1 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2011-09-07T13:44:21.122880Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:52Z |
| Obs used |
109 |
| NEO |
- |
| M1 |
12.300 |
| K1 |
18.250 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2011-07-02.0000000 |
| e |
1.00267426 |
| q (au) |
0.895753 |
| a (au) |
-334.952908 |
| i (deg) |
70.183172 |
| Ω (om, deg) |
324.795673 |
| ω (w, deg) |
119.568947 |
| M (ma, deg) |
-0.010864 |
Magnitude
Scatter + Global Linear
$$
M_a = (13.255 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
13.255 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.500 |
| 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 |
| 2011-06-22 |
2011-07-13 |
+34.0421 |
-6.777 |
| 2011-07-13 |
2011-09-07 |
+17.3304 |
-3.287 |
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 |
11:16:13.91 |
-88:23:21.6 |
HIP 54441 |
4.10 |
| 2026-02-03 12:00 |
11:14:36.67 |
-88:23:55.0 |
HIP 54441 |
3.94 |
| 2026-02-04 00:00 |
11:12:57.73 |
-88:24:27.7 |
HIP 54441 |
3.96 |
| 2026-02-04 12:00 |
11:11:17.10 |
-88:24:59.7 |
HIP 54441 |
4.17 |
| 2026-02-05 00:00 |
11:09:34.79 |
-88:25:31.1 |
HIP 54441 |
4.53 |
| 2026-02-05 12:00 |
11:07:50.81 |
-88:26:01.7 |
HIP 54441 |
5.02 |
| 2026-02-06 00:00 |
11:06:05.18 |
-88:26:31.5 |
HIP 54441 |
5.59 |
| 2026-02-06 12:00 |
11:04:17.90 |
-88:27:00.6 |
HIP 54441 |
6.23 |
| 2026-02-07 00:00 |
11:02:29.01 |
-88:27:29.0 |
HIP 54441 |
6.91 |
| 2026-02-07 12:00 |
11:00:38.51 |
-88:27:56.6 |
HIP 54441 |
7.63 |
| 2026-02-08 00:00 |
10:58:46.45 |
-88:28:23.4 |
HIP 54441 |
8.38 |
| 2026-02-08 12:00 |
10:56:52.83 |
-88:28:49.5 |
HIP 54441 |
9.14 |
| 2026-02-09 00:00 |
10:54:57.70 |
-88:29:14.7 |
HIP 54441 |
9.92 |
| 2026-02-09 12:00 |
10:53:01.07 |
-88:29:39.1 |
HIP 54441 |
10.70 |
| 2026-02-10 00:00 |
10:51:02.99 |
-88:30:02.7 |
HIP 54441 |
11.50 |
| 2026-02-10 12:00 |
10:49:03.49 |
-88:30:25.4 |
HIP 54441 |
12.30 |
| 2026-02-11 00:00 |
10:47:02.61 |
-88:30:47.3 |
HIP 54441 |
13.10 |
| 2026-02-11 12:00 |
10:45:00.39 |
-88:31:08.3 |
HIP 54441 |
13.91 |
| 2026-02-12 00:00 |
10:42:56.87 |
-88:31:28.5 |
HIP 54441 |
14.73 |
| 2026-02-12 12:00 |
10:40:52.10 |
-88:31:47.8 |
HIP 54441 |
15.54 |
| 2026-02-13 00:00 |
10:38:46.13 |
-88:32:06.2 |
HIP 49368 |
14.96 |
| 2026-02-13 12:00 |
10:36:39.00 |
-88:32:23.7 |
HIP 49368 |
14.14 |
| 2026-02-14 00:00 |
10:34:30.78 |
-88:32:40.3 |
HIP 49368 |
13.33 |
| 2026-02-14 12:00 |
10:32:21.51 |
-88:32:56.0 |
HIP 49368 |
12.53 |
| 2026-02-15 00:00 |
10:30:11.26 |
-88:33:10.7 |
HIP 49368 |
11.75 |
| 2026-02-15 12:00 |
10:28:00.09 |
-88:33:24.5 |
HIP 49368 |
10.98 |
| 2026-02-16 00:00 |
10:25:48.05 |
-88:33:37.4 |
HIP 49368 |
10.23 |
| 2026-02-16 12:00 |
10:23:35.21 |
-88:33:49.3 |
HIP 49368 |
9.50 |
| 2026-02-17 00:00 |
10:21:21.65 |
-88:34:00.3 |
HIP 49368 |
8.80 |
| 2026-02-17 12:00 |
10:19:07.41 |
-88:34:10.4 |
HIP 49368 |
8.14 |
| 2026-02-18 00:00 |
10:16:52.58 |
-88:34:19.4 |
HIP 49368 |
7.52 |
| 2026-02-18 12:00 |
10:14:37.22 |
-88:34:27.6 |
HIP 49368 |
6.96 |
| 2026-02-19 00:00 |
10:12:21.42 |
-88:34:34.7 |
HIP 49368 |
6.47 |
| 2026-02-19 12:00 |
10:10:05.23 |
-88:34:40.9 |
HIP 49368 |
6.07 |
| 2026-02-20 00:00 |
10:07:48.73 |
-88:34:46.1 |
HIP 49368 |
5.77 |
| 2026-02-20 12:00 |
10:05:32.00 |
-88:34:50.3 |
HIP 49368 |
5.60 |
| 2026-02-21 00:00 |
10:03:15.12 |
-88:34:53.6 |
HIP 49368 |
5.56 |
| 2026-02-21 12:00 |
10:00:58.15 |
-88:34:55.8 |
HIP 49368 |
5.66 |
| 2026-02-22 00:00 |
09:58:41.18 |
-88:34:57.2 |
HIP 49368 |
5.88 |
| 2026-02-22 12:00 |
09:56:24.28 |
-88:34:57.5 |
HIP 49368 |
6.22 |
| 2026-02-23 00:00 |
09:54:07.52 |
-88:34:56.8 |
HIP 49368 |
6.66 |
| 2026-02-23 12:00 |
09:51:50.98 |
-88:34:55.2 |
HIP 49368 |
7.18 |
| 2026-02-24 00:00 |
09:49:34.74 |
-88:34:52.7 |
HIP 49368 |
7.76 |