| 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) |
| 2026-03-26 00:00 |
03:35:28.21 |
+38:41:41.7 |
HIP 16719 |
7.83 |
| 2026-03-26 12:00 |
03:35:31.48 |
+38:41:33.9 |
HIP 16719 |
8.10 |
| 2026-03-27 00:00 |
03:35:34.79 |
+38:41:26.2 |
HIP 16719 |
8.41 |
| 2026-03-27 12:00 |
03:35:38.12 |
+38:41:18.7 |
HIP 16719 |
8.77 |
| 2026-03-28 00:00 |
03:35:41.48 |
+38:41:11.5 |
HIP 16719 |
9.17 |
| 2026-03-28 12:00 |
03:35:44.86 |
+38:41:04.4 |
HIP 16719 |
9.60 |
| 2026-03-29 00:00 |
03:35:48.28 |
+38:40:57.4 |
HIP 16719 |
10.06 |
| 2026-03-29 12:00 |
03:35:51.72 |
+38:40:50.7 |
HIP 16719 |
10.56 |
| 2026-03-30 00:00 |
03:35:55.19 |
+38:40:44.2 |
HIP 16719 |
11.08 |
| 2026-03-30 12:00 |
03:35:58.69 |
+38:40:37.8 |
HIP 16719 |
11.63 |
| 2026-03-31 00:00 |
03:36:02.22 |
+38:40:31.6 |
HIP 16719 |
12.19 |
| 2026-03-31 12:00 |
03:36:05.77 |
+38:40:25.6 |
HIP 16719 |
12.78 |
| 2026-04-01 00:00 |
03:36:09.35 |
+38:40:19.8 |
HIP 16719 |
13.38 |
| 2026-04-01 12:00 |
03:36:12.95 |
+38:40:14.2 |
HIP 16719 |
14.00 |
| 2026-04-02 00:00 |
03:36:16.58 |
+38:40:08.8 |
HIP 16719 |
14.63 |
| 2026-04-02 12:00 |
03:36:20.24 |
+38:40:03.5 |
HIP 16719 |
15.27 |
| 2026-04-03 00:00 |
03:36:23.92 |
+38:39:58.4 |
HIP 16719 |
15.93 |
| 2026-04-03 12:00 |
03:36:27.63 |
+38:39:53.5 |
HIP 16719 |
16.60 |
| 2026-04-04 00:00 |
03:36:31.37 |
+38:39:48.8 |
HIP 16719 |
17.28 |
| 2026-04-04 12:00 |
03:36:35.12 |
+38:39:44.3 |
HIP 16719 |
17.96 |
| 2026-04-05 00:00 |
03:36:38.91 |
+38:39:40.0 |
HIP 16719 |
18.66 |
| 2026-04-05 12:00 |
03:36:42.72 |
+38:39:35.8 |
HIP 16719 |
19.37 |
| 2026-04-06 00:00 |
03:36:46.55 |
+38:39:31.8 |
HIP 16719 |
20.08 |
| 2026-04-06 12:00 |
03:36:50.40 |
+38:39:28.1 |
HIP 16719 |
20.81 |
| 2026-04-07 00:00 |
03:36:54.28 |
+38:39:24.4 |
HIP 16719 |
21.54 |
| 2026-04-07 12:00 |
03:36:58.19 |
+38:39:21.0 |
HIP 16719 |
22.27 |
| 2026-04-08 00:00 |
03:37:02.12 |
+38:39:17.8 |
HIP 17019 |
22.61 |
| 2026-04-08 12:00 |
03:37:06.07 |
+38:39:14.7 |
HIP 17019 |
21.86 |
| 2026-04-09 00:00 |
03:37:10.04 |
+38:39:11.9 |
HIP 17019 |
21.10 |
| 2026-04-09 12:00 |
03:37:14.03 |
+38:39:09.2 |
HIP 17019 |
20.34 |
| 2026-04-10 00:00 |
03:37:18.05 |
+38:39:06.7 |
HIP 17019 |
19.58 |
| 2026-04-10 12:00 |
03:37:22.09 |
+38:39:04.3 |
HIP 17019 |
18.81 |
| 2026-04-11 00:00 |
03:37:26.15 |
+38:39:02.2 |
HIP 17019 |
18.04 |
| 2026-04-11 12:00 |
03:37:30.24 |
+38:39:00.2 |
HIP 17019 |
17.27 |
| 2026-04-12 00:00 |
03:37:34.34 |
+38:38:58.4 |
HIP 17019 |
16.49 |
| 2026-04-12 12:00 |
03:37:38.47 |
+38:38:56.8 |
HIP 17019 |
15.72 |
| 2026-04-13 00:00 |
03:37:42.61 |
+38:38:55.4 |
HIP 17019 |
14.94 |
| 2026-04-13 12:00 |
03:37:46.78 |
+38:38:54.2 |
HIP 17019 |
14.16 |
| 2026-04-14 00:00 |
03:37:50.97 |
+38:38:53.1 |
HIP 17019 |
13.38 |
| 2026-04-14 12:00 |
03:37:55.17 |
+38:38:52.3 |
HIP 17019 |
12.60 |
| 2026-04-15 00:00 |
03:37:59.40 |
+38:38:51.6 |
HIP 17019 |
11.83 |
| 2026-04-15 12:00 |
03:38:03.64 |
+38:38:51.0 |
HIP 17019 |
11.05 |
| 2026-04-16 00:00 |
03:38:07.91 |
+38:38:50.7 |
HIP 17019 |
10.28 |