| 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) |
| 2026-03-26 00:00 |
02:59:48.89 |
+64:32:31.4 |
HIP 13828 |
13.99 |
| 2026-03-26 12:00 |
02:59:56.18 |
+64:32:02.2 |
HIP 13828 |
14.42 |
| 2026-03-27 00:00 |
03:00:03.52 |
+64:31:33.5 |
HIP 13828 |
14.91 |
| 2026-03-27 12:00 |
03:00:10.92 |
+64:31:05.1 |
HIP 13828 |
15.45 |
| 2026-03-28 00:00 |
03:00:18.36 |
+64:30:37.2 |
HIP 14154 |
15.97 |
| 2026-03-28 12:00 |
03:00:25.86 |
+64:30:09.7 |
HIP 14154 |
15.04 |
| 2026-03-29 00:00 |
03:00:33.40 |
+64:29:42.6 |
HIP 14154 |
14.12 |
| 2026-03-29 12:00 |
03:00:40.99 |
+64:29:16.0 |
HIP 14154 |
13.19 |
| 2026-03-30 00:00 |
03:00:48.64 |
+64:28:49.7 |
HIP 14154 |
12.25 |
| 2026-03-30 12:00 |
03:00:56.32 |
+64:28:23.8 |
HIP 14154 |
11.32 |
| 2026-03-31 00:00 |
03:01:04.06 |
+64:27:58.4 |
HIP 14154 |
10.38 |
| 2026-03-31 12:00 |
03:01:11.84 |
+64:27:33.4 |
HIP 14154 |
9.45 |
| 2026-04-01 00:00 |
03:01:19.67 |
+64:27:08.8 |
HIP 14154 |
8.51 |
| 2026-04-01 12:00 |
03:01:27.55 |
+64:26:44.6 |
HIP 14154 |
7.57 |
| 2026-04-02 00:00 |
03:01:35.47 |
+64:26:20.8 |
HIP 14154 |
6.64 |
| 2026-04-02 12:00 |
03:01:43.43 |
+64:25:57.4 |
HIP 14154 |
5.70 |
| 2026-04-03 00:00 |
03:01:51.44 |
+64:25:34.5 |
HIP 14154 |
4.77 |
| 2026-04-03 12:00 |
03:01:59.49 |
+64:25:11.9 |
HIP 14154 |
3.84 |
| 2026-04-04 00:00 |
03:02:07.58 |
+64:24:49.8 |
HIP 14154 |
2.92 |
| 2026-04-04 12:00 |
03:02:15.72 |
+64:24:28.1 |
HIP 14154 |
2.03 |
| 2026-04-05 00:00 |
03:02:23.89 |
+64:24:06.8 |
HIP 14154 |
1.24 |
| 2026-04-05 12:00 |
03:02:32.11 |
+64:23:46.0 |
HIP 14154 |
0.89 |
| 2026-04-06 00:00 |
03:02:40.37 |
+64:23:25.5 |
HIP 14154 |
1.37 |
| 2026-04-06 12:00 |
03:02:48.67 |
+64:23:05.5 |
HIP 14154 |
2.20 |
| 2026-04-07 00:00 |
03:02:57.01 |
+64:22:45.9 |
HIP 14154 |
3.10 |
| 2026-04-07 12:00 |
03:03:05.38 |
+64:22:26.7 |
HIP 14154 |
4.04 |
| 2026-04-08 00:00 |
03:03:13.80 |
+64:22:07.9 |
HIP 14154 |
4.98 |
| 2026-04-08 12:00 |
03:03:22.25 |
+64:21:49.5 |
HIP 14154 |
5.94 |
| 2026-04-09 00:00 |
03:03:30.75 |
+64:21:31.6 |
HIP 14154 |
6.90 |
| 2026-04-09 12:00 |
03:03:39.27 |
+64:21:14.1 |
HIP 14154 |
7.86 |
| 2026-04-10 00:00 |
03:03:47.84 |
+64:20:57.0 |
HIP 14154 |
8.83 |
| 2026-04-10 12:00 |
03:03:56.44 |
+64:20:40.3 |
HIP 14154 |
9.80 |
| 2026-04-11 00:00 |
03:04:05.07 |
+64:20:24.0 |
HIP 14154 |
10.77 |
| 2026-04-11 12:00 |
03:04:13.74 |
+64:20:08.2 |
HIP 14154 |
11.75 |
| 2026-04-12 00:00 |
03:04:22.45 |
+64:19:52.8 |
HIP 14154 |
12.72 |
| 2026-04-12 12:00 |
03:04:31.18 |
+64:19:37.8 |
HIP 14154 |
13.70 |
| 2026-04-13 00:00 |
03:04:39.95 |
+64:19:23.2 |
HIP 14154 |
14.68 |
| 2026-04-13 12:00 |
03:04:48.75 |
+64:19:09.0 |
HIP 14154 |
15.66 |
| 2026-04-14 00:00 |
03:04:57.59 |
+64:18:55.3 |
HIP 14154 |
16.65 |
| 2026-04-14 12:00 |
03:05:06.45 |
+64:18:42.0 |
HIP 14154 |
17.63 |
| 2026-04-15 00:00 |
03:05:15.35 |
+64:18:29.1 |
HIP 14154 |
18.62 |
| 2026-04-15 12:00 |
03:05:24.27 |
+64:18:16.6 |
HIP 14502 |
19.38 |
| 2026-04-16 00:00 |
03:05:33.23 |
+64:18:04.5 |
HIP 14502 |
18.61 |