| Parameter |
Value |
| Designation |
C/2016 J2 (Denneau) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2016-04-11T23:26:33.532800Z |
| Orbit solution date (soln_date, UTC) |
2024-02-01T00:42:36Z |
| Obs used |
85 |
| NEO |
- |
| M1 |
17.200 |
| K1 |
4.500 |
| PC |
- |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2016-03-20.0000000 |
| e |
1.00064898 |
| q (au) |
1.518730 |
| a (au) |
-2340.194593 |
| i (deg) |
130.346599 |
| Ω (om, deg) |
186.183773 |
| ω (w, deg) |
318.487333 |
| M (ma, deg) |
-0.000200 |
Magnitude
Scatter + Global Linear
$$
M_a = (18.665 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
18.665 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-1.000 |
| k |
0.801 |
| 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) |
| 2026-05-12 00:00 |
03:13:44.15 |
+64:17:03.2 |
HIP 15138 |
21.62 |
| 2026-05-12 12:00 |
03:13:53.82 |
+64:17:12.6 |
HIP 15138 |
21.34 |
| 2026-05-13 00:00 |
03:14:03.47 |
+64:17:22.3 |
HIP 15138 |
21.11 |
| 2026-05-13 12:00 |
03:14:13.13 |
+64:17:32.4 |
HIP 15138 |
20.94 |
| 2026-05-14 00:00 |
03:14:22.79 |
+64:17:42.8 |
HIP 15138 |
20.83 |
| 2026-05-14 12:00 |
03:14:32.44 |
+64:17:53.7 |
HIP 15138 |
20.78 |
| 2026-05-15 00:00 |
03:14:42.09 |
+64:18:04.9 |
HIP 15321 |
20.07 |
| 2026-05-15 12:00 |
03:14:51.73 |
+64:18:16.5 |
HIP 15321 |
19.13 |
| 2026-05-16 00:00 |
03:15:01.37 |
+64:18:28.5 |
HIP 15321 |
18.21 |
| 2026-05-16 12:00 |
03:15:11.00 |
+64:18:40.8 |
HIP 15321 |
17.30 |
| 2026-05-17 00:00 |
03:15:20.62 |
+64:18:53.5 |
HIP 15321 |
16.41 |
| 2026-05-17 12:00 |
03:15:30.24 |
+64:19:06.6 |
HIP 15321 |
15.55 |
| 2026-05-18 00:00 |
03:15:39.85 |
+64:19:20.1 |
HIP 15321 |
14.73 |
| 2026-05-18 12:00 |
03:15:49.45 |
+64:19:33.9 |
HIP 15321 |
13.94 |
| 2026-05-19 00:00 |
03:15:59.05 |
+64:19:48.1 |
HIP 15321 |
13.19 |
| 2026-05-19 12:00 |
03:16:08.63 |
+64:20:02.7 |
HIP 15321 |
12.49 |
| 2026-05-20 00:00 |
03:16:18.20 |
+64:20:17.6 |
HIP 15321 |
11.86 |
| 2026-05-20 12:00 |
03:16:27.77 |
+64:20:32.9 |
HIP 15321 |
11.29 |
| 2026-05-21 00:00 |
03:16:37.32 |
+64:20:48.5 |
HIP 15321 |
10.81 |
| 2026-05-21 12:00 |
03:16:46.86 |
+64:21:04.5 |
HIP 15321 |
10.42 |
| 2026-05-22 00:00 |
03:16:56.39 |
+64:21:20.9 |
HIP 15321 |
10.14 |
| 2026-05-22 12:00 |
03:17:05.90 |
+64:21:37.6 |
HIP 15321 |
9.97 |
| 2026-05-23 00:00 |
03:17:15.40 |
+64:21:54.7 |
HIP 15321 |
9.92 |
| 2026-05-23 12:00 |
03:17:24.89 |
+64:22:12.1 |
HIP 15321 |
9.99 |
| 2026-05-24 00:00 |
03:17:34.36 |
+64:22:29.9 |
HIP 15321 |
10.17 |
| 2026-05-24 12:00 |
03:17:43.82 |
+64:22:48.0 |
HIP 15321 |
10.47 |
| 2026-05-25 00:00 |
03:17:53.26 |
+64:23:06.5 |
HIP 15321 |
10.88 |
| 2026-05-25 12:00 |
03:18:02.68 |
+64:23:25.3 |
HIP 15321 |
11.37 |
| 2026-05-26 00:00 |
03:18:12.09 |
+64:23:44.5 |
HIP 15321 |
11.95 |
| 2026-05-26 12:00 |
03:18:21.48 |
+64:24:04.0 |
HIP 15321 |
12.59 |
| 2026-05-27 00:00 |
03:18:30.85 |
+64:24:23.8 |
HIP 15321 |
13.30 |
| 2026-05-27 12:00 |
03:18:40.20 |
+64:24:44.0 |
HIP 15321 |
14.05 |
| 2026-05-28 00:00 |
03:18:49.54 |
+64:25:04.5 |
HIP 15321 |
14.84 |
| 2026-05-28 12:00 |
03:18:58.86 |
+64:25:25.4 |
HIP 15321 |
15.68 |
| 2026-05-29 00:00 |
03:19:08.15 |
+64:25:46.6 |
HIP 15321 |
16.54 |
| 2026-05-29 12:00 |
03:19:17.43 |
+64:26:08.1 |
HIP 15321 |
17.42 |
| 2026-05-30 00:00 |
03:19:26.68 |
+64:26:30.0 |
HIP 15321 |
18.33 |
| 2026-05-30 12:00 |
03:19:35.92 |
+64:26:52.2 |
HIP 15321 |
19.26 |
| 2026-05-31 00:00 |
03:19:45.13 |
+64:27:14.7 |
HIP 15321 |
20.20 |
| 2026-05-31 12:00 |
03:19:54.32 |
+64:27:37.6 |
HIP 15321 |
21.16 |
| 2026-06-01 00:00 |
03:20:03.48 |
+64:28:00.7 |
HIP 15321 |
22.13 |
| 2026-06-01 12:00 |
03:20:12.63 |
+64:28:24.2 |
HIP 15321 |
23.11 |
| 2026-06-02 00:00 |
03:20:21.74 |
+64:28:48.1 |
HIP 15321 |
24.10 |