C/2011 N2 (McNaught)
| Parameter |
Value |
| Designation |
C/2011 N2 (McNaught) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2011-10-18T17:49:39.725760Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:53Z |
| Obs used |
46 |
| NEO |
- |
| M1 |
7.100 |
| K1 |
21.250 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2011-07-25.0000000 |
| e |
0.99970333 |
| q (au) |
2.563360 |
| a (au) |
8640.435892 |
| i (deg) |
33.675025 |
| Ω (om, deg) |
274.019032 |
| ω (w, deg) |
357.041413 |
| M (ma, deg) |
359.999895 |
Magnitude
Scatter + Global Linear
$$
M_a = (8.856 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
8.856 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.999 |
| 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
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-02-03 00:00 |
03:33:03.61 |
+39:09:43.9 |
HIP 16636 |
14.27 |
| 2026-02-03 12:00 |
03:33:02.98 |
+39:09:20.5 |
HIP 16636 |
14.61 |
| 2026-02-04 00:00 |
03:33:02.39 |
+39:08:57.1 |
HIP 16636 |
14.94 |
| 2026-02-04 12:00 |
03:33:01.84 |
+39:08:33.9 |
HIP 16636 |
15.27 |
| 2026-02-05 00:00 |
03:33:01.34 |
+39:08:10.7 |
HIP 16636 |
15.60 |
| 2026-02-05 12:00 |
03:33:00.88 |
+39:07:47.7 |
HIP 16636 |
15.92 |
| 2026-02-06 00:00 |
03:33:00.46 |
+39:07:24.8 |
HIP 16636 |
16.23 |
| 2026-02-06 12:00 |
03:33:00.08 |
+39:07:01.9 |
HIP 16636 |
16.55 |
| 2026-02-07 00:00 |
03:32:59.75 |
+39:06:39.2 |
HIP 16636 |
16.85 |
| 2026-02-07 12:00 |
03:32:59.46 |
+39:06:16.5 |
HIP 16636 |
17.16 |
| 2026-02-08 00:00 |
03:32:59.21 |
+39:05:54.0 |
HIP 16636 |
17.46 |
| 2026-02-08 12:00 |
03:32:59.01 |
+39:05:31.6 |
HIP 16636 |
17.76 |
| 2026-02-09 00:00 |
03:32:58.84 |
+39:05:09.3 |
HIP 16636 |
18.05 |
| 2026-02-09 12:00 |
03:32:58.72 |
+39:04:47.1 |
HIP 16636 |
18.34 |
| 2026-02-10 00:00 |
03:32:58.65 |
+39:04:25.0 |
HIP 16636 |
18.62 |
| 2026-02-10 12:00 |
03:32:58.61 |
+39:04:03.0 |
HIP 16636 |
18.90 |
| 2026-02-11 00:00 |
03:32:58.62 |
+39:03:41.2 |
HIP 16636 |
19.18 |
| 2026-02-11 12:00 |
03:32:58.67 |
+39:03:19.4 |
HIP 16636 |
19.45 |
| 2026-02-12 00:00 |
03:32:58.77 |
+39:02:57.8 |
HIP 16636 |
19.72 |
| 2026-02-12 12:00 |
03:32:58.90 |
+39:02:36.3 |
HIP 16636 |
19.99 |
| 2026-02-13 00:00 |
03:32:59.08 |
+39:02:14.9 |
HIP 16636 |
20.25 |
| 2026-02-13 12:00 |
03:32:59.30 |
+39:01:53.6 |
HIP 16636 |
20.51 |
| 2026-02-14 00:00 |
03:32:59.57 |
+39:01:32.5 |
HIP 16636 |
20.76 |
| 2026-02-14 12:00 |
03:32:59.87 |
+39:01:11.5 |
HIP 16636 |
21.01 |
| 2026-02-15 00:00 |
03:33:00.22 |
+39:00:50.6 |
HIP 16636 |
21.26 |
| 2026-02-15 12:00 |
03:33:00.61 |
+39:00:29.9 |
HIP 16636 |
21.50 |
| 2026-02-16 00:00 |
03:33:01.04 |
+39:00:09.3 |
HIP 16636 |
21.75 |
| 2026-02-16 12:00 |
03:33:01.52 |
+38:59:48.8 |
HIP 16636 |
21.98 |
| 2026-02-17 00:00 |
03:33:02.04 |
+38:59:28.4 |
HIP 16636 |
22.22 |
| 2026-02-17 12:00 |
03:33:02.60 |
+38:59:08.2 |
HIP 16636 |
22.45 |
| 2026-02-18 00:00 |
03:33:03.20 |
+38:58:48.1 |
HIP 16692 |
22.38 |
| 2026-02-18 12:00 |
03:33:03.84 |
+38:58:28.2 |
HIP 16692 |
22.12 |
| 2026-02-19 00:00 |
03:33:04.53 |
+38:58:08.4 |
HIP 16692 |
21.85 |
| 2026-02-19 12:00 |
03:33:05.26 |
+38:57:48.7 |
HIP 16692 |
21.58 |
| 2026-02-20 00:00 |
03:33:06.03 |
+38:57:29.2 |
HIP 16692 |
21.30 |
| 2026-02-20 12:00 |
03:33:06.84 |
+38:57:09.8 |
HIP 16692 |
21.02 |
| 2026-02-21 00:00 |
03:33:07.69 |
+38:56:50.6 |
HIP 16692 |
20.74 |
| 2026-02-21 12:00 |
03:33:08.58 |
+38:56:31.5 |
HIP 16692 |
20.45 |
| 2026-02-22 00:00 |
03:33:09.52 |
+38:56:12.5 |
HIP 16692 |
20.16 |
| 2026-02-22 12:00 |
03:33:10.50 |
+38:55:53.7 |
HIP 16692 |
19.87 |
| 2026-02-23 00:00 |
03:33:11.51 |
+38:55:35.1 |
HIP 16692 |
19.57 |
| 2026-02-23 12:00 |
03:33:12.57 |
+38:55:16.6 |
HIP 16692 |
19.26 |
| 2026-02-24 00:00 |
03:33:13.67 |
+38:54:58.2 |
HIP 16692 |
18.96 |