| Parameter |
Value |
| Designation |
C/2010 J2 (McNaught) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2010-06-03T20:45:36.622080Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:31:44Z |
| Obs used |
543 |
| NEO |
- |
| M1 |
10.100 |
| K1 |
9.500 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2010-08-16.0000000 |
| e |
0.99945919 |
| q (au) |
3.386996 |
| a (au) |
6262.872230 |
| i (deg) |
125.851540 |
| Ω (om, deg) |
311.794846 |
| ω (w, deg) |
4.616553 |
| M (ma, deg) |
0.000145 |
Magnitude
Scatter + Global Linear
$$
M_a = (11.082 + 2.443\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
11.082 |
| n |
2.443 |
| gf |
0.993 |
| gb |
-1.000 |
| k |
1.000 |
| δ90 |
9.955 |
| 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) |
| 2026-06-01 00:00 |
10:54:29.73 |
+35:17:41.8 |
HIP 53176 |
22.79 |
| 2026-06-01 12:00 |
10:54:29.27 |
+35:17:15.2 |
HIP 53176 |
22.62 |
| 2026-06-02 00:00 |
10:54:28.85 |
+35:16:48.5 |
HIP 53176 |
22.46 |
| 2026-06-02 12:00 |
10:54:28.46 |
+35:16:21.7 |
HIP 53176 |
22.32 |
| 2026-06-03 00:00 |
10:54:28.11 |
+35:15:54.7 |
HIP 53176 |
22.19 |
| 2026-06-03 12:00 |
10:54:27.79 |
+35:15:27.5 |
HIP 53176 |
22.08 |
| 2026-06-04 00:00 |
10:54:27.51 |
+35:15:00.2 |
HIP 53176 |
21.98 |
| 2026-06-04 12:00 |
10:54:27.26 |
+35:14:32.8 |
HIP 53176 |
21.90 |
| 2026-06-05 00:00 |
10:54:27.05 |
+35:14:05.3 |
HIP 53176 |
21.83 |
| 2026-06-05 12:00 |
10:54:26.86 |
+35:13:37.6 |
HIP 53176 |
21.79 |
| 2026-06-06 00:00 |
10:54:26.72 |
+35:13:09.8 |
HIP 53176 |
21.75 |
| 2026-06-06 12:00 |
10:54:26.60 |
+35:12:41.9 |
HIP 53176 |
21.74 |
| 2026-06-07 00:00 |
10:54:26.53 |
+35:12:13.9 |
HIP 53176 |
21.74 |
| 2026-06-07 12:00 |
10:54:26.48 |
+35:11:45.7 |
HIP 53176 |
21.76 |
| 2026-06-08 00:00 |
10:54:26.47 |
+35:11:17.4 |
HIP 53176 |
21.80 |
| 2026-06-08 12:00 |
10:54:26.49 |
+35:10:49.0 |
HIP 53176 |
21.85 |
| 2026-06-09 00:00 |
10:54:26.55 |
+35:10:20.5 |
HIP 53176 |
21.92 |
| 2026-06-09 12:00 |
10:54:26.64 |
+35:09:51.8 |
HIP 53176 |
22.01 |
| 2026-06-10 00:00 |
10:54:26.76 |
+35:09:23.1 |
HIP 53176 |
22.12 |
| 2026-06-10 12:00 |
10:54:26.92 |
+35:08:54.2 |
HIP 53176 |
22.24 |
| 2026-06-11 00:00 |
10:54:27.11 |
+35:08:25.2 |
HIP 53176 |
22.38 |
| 2026-06-11 12:00 |
10:54:27.34 |
+35:07:56.1 |
HIP 53176 |
22.54 |
| 2026-06-12 00:00 |
10:54:27.60 |
+35:07:26.9 |
HIP 53176 |
22.71 |
| 2026-06-12 12:00 |
10:54:27.89 |
+35:06:57.6 |
HIP 53176 |
22.90 |
| 2026-06-13 00:00 |
10:54:28.22 |
+35:06:28.2 |
HIP 53176 |
23.10 |
| 2026-06-13 12:00 |
10:54:28.58 |
+35:05:58.8 |
HIP 53176 |
23.32 |
| 2026-06-14 00:00 |
10:54:28.97 |
+35:05:29.2 |
HIP 53176 |
23.56 |
| 2026-06-14 12:00 |
10:54:29.39 |
+35:04:59.5 |
HIP 53176 |
23.81 |
| 2026-06-15 00:00 |
10:54:29.85 |
+35:04:29.7 |
HIP 53176 |
24.07 |
| 2026-06-15 12:00 |
10:54:30.34 |
+35:03:59.8 |
HIP 53176 |
24.35 |
| 2026-06-16 00:00 |
10:54:30.87 |
+35:03:29.9 |
HIP 53176 |
24.65 |
| 2026-06-16 12:00 |
10:54:31.42 |
+35:02:59.8 |
HIP 53176 |
24.96 |
| 2026-06-17 00:00 |
10:54:32.01 |
+35:02:29.7 |
HIP 53176 |
25.28 |
| 2026-06-17 12:00 |
10:54:32.64 |
+35:01:59.5 |
HIP 53176 |
25.61 |
| 2026-06-18 00:00 |
10:54:33.29 |
+35:01:29.2 |
HIP 53176 |
25.96 |
| 2026-06-18 12:00 |
10:54:33.98 |
+35:00:58.8 |
HIP 53176 |
26.32 |
| 2026-06-19 00:00 |
10:54:34.70 |
+35:00:28.3 |
HIP 53176 |
26.69 |
| 2026-06-19 12:00 |
10:54:35.45 |
+34:59:57.8 |
HIP 53176 |
27.07 |
| 2026-06-20 00:00 |
10:54:36.23 |
+34:59:27.2 |
HIP 53176 |
27.47 |
| 2026-06-20 12:00 |
10:54:37.05 |
+34:58:56.5 |
HIP 53176 |
27.87 |
| 2026-06-21 00:00 |
10:54:37.89 |
+34:58:25.8 |
HIP 53176 |
28.28 |
| 2026-06-21 12:00 |
10:54:38.77 |
+34:57:55.0 |
HIP 53176 |
28.71 |
| 2026-06-22 00:00 |
10:54:39.68 |
+34:57:24.2 |
HIP 53176 |
29.15 |