| Parameter |
Value |
| Designation |
C/2013 J3 (McNaught) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2013-02-22T21:02:36.003840Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:32:35Z |
| Obs used |
105 |
| NEO |
- |
| M1 |
6.900 |
| K1 |
14.250 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2013-07-03.0000000 |
| e |
0.99795766 |
| q (au) |
3.988692 |
| a (au) |
1952.998658 |
| i (deg) |
118.225398 |
| Ω (om, deg) |
200.757159 |
| ω (w, deg) |
320.958517 |
| M (ma, deg) |
0.001486 |
Magnitude
Scatter + Global Linear
$$
M_a = (5.562 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
5.562 |
| 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
Ephemeris
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-06-01 00:00 |
07:14:55.86 |
+82:30:20.4 |
HIP 35159 |
4.45 |
| 2026-06-01 12:00 |
07:15:17.57 |
+82:29:45.2 |
HIP 35159 |
3.61 |
| 2026-06-02 00:00 |
07:15:39.38 |
+82:29:10.4 |
HIP 35159 |
2.83 |
| 2026-06-02 12:00 |
07:16:01.28 |
+82:28:35.8 |
HIP 35159 |
2.17 |
| 2026-06-03 00:00 |
07:16:23.28 |
+82:28:01.5 |
HIP 35159 |
1.76 |
| 2026-06-03 12:00 |
07:16:45.37 |
+82:27:27.5 |
HIP 35159 |
1.80 |
| 2026-06-04 00:00 |
07:17:07.55 |
+82:26:53.8 |
HIP 35159 |
2.25 |
| 2026-06-04 12:00 |
07:17:29.81 |
+82:26:20.4 |
HIP 35159 |
2.94 |
| 2026-06-05 00:00 |
07:17:52.17 |
+82:25:47.2 |
HIP 35159 |
3.73 |
| 2026-06-05 12:00 |
07:18:14.61 |
+82:25:14.4 |
HIP 35159 |
4.57 |
| 2026-06-06 00:00 |
07:18:37.14 |
+82:24:41.8 |
HIP 35159 |
5.44 |
| 2026-06-06 12:00 |
07:18:59.75 |
+82:24:09.6 |
HIP 35159 |
6.33 |
| 2026-06-07 00:00 |
07:19:22.45 |
+82:23:37.6 |
HIP 35159 |
7.23 |
| 2026-06-07 12:00 |
07:19:45.22 |
+82:23:05.9 |
HIP 35159 |
8.13 |
| 2026-06-08 00:00 |
07:20:08.08 |
+82:22:34.5 |
HIP 35159 |
9.04 |
| 2026-06-08 12:00 |
07:20:31.02 |
+82:22:03.5 |
HIP 35159 |
9.95 |
| 2026-06-09 00:00 |
07:20:54.03 |
+82:21:32.7 |
HIP 35159 |
10.87 |
| 2026-06-09 12:00 |
07:21:17.12 |
+82:21:02.2 |
HIP 36103 |
10.44 |
| 2026-06-10 00:00 |
07:21:40.29 |
+82:20:32.0 |
HIP 36103 |
9.56 |
| 2026-06-10 12:00 |
07:22:03.54 |
+82:20:02.1 |
HIP 36103 |
8.68 |
| 2026-06-11 00:00 |
07:22:26.85 |
+82:19:32.5 |
HIP 36103 |
7.81 |
| 2026-06-11 12:00 |
07:22:50.24 |
+82:19:03.3 |
HIP 36103 |
6.95 |
| 2026-06-12 00:00 |
07:23:13.70 |
+82:18:34.3 |
HIP 36103 |
6.10 |
| 2026-06-12 12:00 |
07:23:37.23 |
+82:18:05.6 |
HIP 36103 |
5.28 |
| 2026-06-13 00:00 |
07:24:00.83 |
+82:17:37.3 |
HIP 36103 |
4.48 |
| 2026-06-13 12:00 |
07:24:24.50 |
+82:17:09.2 |
HIP 36103 |
3.74 |
| 2026-06-14 00:00 |
07:24:48.23 |
+82:16:41.5 |
HIP 36103 |
3.10 |
| 2026-06-14 12:00 |
07:25:12.02 |
+82:16:14.0 |
HIP 36103 |
2.61 |
| 2026-06-15 00:00 |
07:25:35.88 |
+82:15:46.9 |
HIP 36103 |
2.39 |
| 2026-06-15 12:00 |
07:25:59.80 |
+82:15:20.1 |
HIP 36103 |
2.51 |
| 2026-06-16 00:00 |
07:26:23.79 |
+82:14:53.6 |
HIP 36103 |
2.92 |
| 2026-06-16 12:00 |
07:26:47.83 |
+82:14:27.5 |
HIP 36103 |
3.52 |
| 2026-06-17 00:00 |
07:27:11.93 |
+82:14:01.6 |
HIP 36103 |
4.24 |
| 2026-06-17 12:00 |
07:27:36.08 |
+82:13:36.0 |
HIP 36103 |
5.02 |
| 2026-06-18 00:00 |
07:28:00.29 |
+82:13:10.8 |
HIP 36103 |
5.83 |
| 2026-06-18 12:00 |
07:28:24.56 |
+82:12:45.9 |
HIP 36103 |
6.67 |
| 2026-06-19 00:00 |
07:28:48.87 |
+82:12:21.3 |
HIP 36103 |
7.53 |
| 2026-06-19 12:00 |
07:29:13.24 |
+82:11:57.0 |
HIP 36103 |
8.40 |
| 2026-06-20 00:00 |
07:29:37.66 |
+82:11:33.1 |
HIP 36103 |
9.27 |
| 2026-06-20 12:00 |
07:30:02.13 |
+82:11:09.4 |
HIP 36103 |
10.15 |
| 2026-06-21 00:00 |
07:30:26.64 |
+82:10:46.1 |
HIP 36103 |
11.04 |
| 2026-06-21 12:00 |
07:30:51.20 |
+82:10:23.1 |
HIP 36103 |
11.93 |
| 2026-06-22 00:00 |
07:31:15.81 |
+82:10:00.5 |
HIP 36103 |
12.82 |