| 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
$$
M_a = (18.666 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
18.666 |
| n |
2.000 |
| gf |
0.999 |
| 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) |
| 2026-09-20 00:00 |
03:29:20.49 |
+66:59:35.4 |
HIP 16404 |
19.28 |
| 2026-09-20 12:00 |
03:29:13.42 |
+67:00:09.2 |
HIP 16404 |
20.15 |
| 2026-09-21 00:00 |
03:29:06.26 |
+67:00:42.8 |
HIP 16404 |
21.02 |
| 2026-09-21 12:00 |
03:28:59.01 |
+67:01:15.9 |
HIP 16404 |
21.89 |
| 2026-09-22 00:00 |
03:28:51.66 |
+67:01:48.8 |
HIP 16404 |
22.76 |
| 2026-09-22 12:00 |
03:28:44.23 |
+67:02:21.3 |
HIP 16404 |
23.64 |
| 2026-09-23 00:00 |
03:28:36.71 |
+67:02:53.4 |
HIP 16404 |
24.52 |
| 2026-09-23 12:00 |
03:28:29.10 |
+67:03:25.2 |
HIP 16404 |
25.40 |
| 2026-09-24 00:00 |
03:28:21.41 |
+67:03:56.6 |
HIP 16404 |
26.29 |
| 2026-09-24 12:00 |
03:28:13.62 |
+67:04:27.7 |
HIP 16404 |
27.17 |
| 2026-09-25 00:00 |
03:28:05.75 |
+67:04:58.4 |
HIP 16404 |
28.07 |
| 2026-09-25 12:00 |
03:27:57.79 |
+67:05:28.8 |
HIP 15765 |
28.44 |
| 2026-09-26 00:00 |
03:27:49.75 |
+67:05:58.8 |
HIP 15765 |
27.59 |
| 2026-09-26 12:00 |
03:27:41.62 |
+67:06:28.4 |
HIP 15765 |
26.74 |
| 2026-09-27 00:00 |
03:27:33.41 |
+67:06:57.6 |
HIP 15765 |
25.88 |
| 2026-09-27 12:00 |
03:27:25.11 |
+67:07:26.5 |
HIP 15765 |
25.02 |
| 2026-09-28 00:00 |
03:27:16.72 |
+67:07:55.0 |
HIP 15765 |
24.16 |
| 2026-09-28 12:00 |
03:27:08.26 |
+67:08:23.0 |
HIP 15765 |
23.30 |
| 2026-09-29 00:00 |
03:26:59.71 |
+67:08:50.8 |
HIP 15765 |
22.44 |
| 2026-09-29 12:00 |
03:26:51.07 |
+67:09:18.1 |
HIP 15765 |
21.58 |
| 2026-09-30 00:00 |
03:26:42.36 |
+67:09:45.0 |
HIP 15765 |
20.72 |
| 2026-09-30 12:00 |
03:26:33.56 |
+67:10:11.5 |
HIP 15765 |
19.86 |
| 2026-10-01 00:00 |
03:26:24.69 |
+67:10:37.6 |
HIP 15765 |
19.01 |
| 2026-10-01 12:00 |
03:26:15.73 |
+67:11:03.3 |
HIP 15765 |
18.15 |
| 2026-10-02 00:00 |
03:26:06.69 |
+67:11:28.6 |
HIP 15765 |
17.31 |
| 2026-10-02 12:00 |
03:25:57.57 |
+67:11:53.5 |
HIP 15765 |
16.47 |
| 2026-10-03 00:00 |
03:25:48.38 |
+67:12:18.0 |
HIP 15765 |
15.63 |
| 2026-10-03 12:00 |
03:25:39.10 |
+67:12:42.0 |
HIP 15765 |
14.81 |
| 2026-10-04 00:00 |
03:25:29.75 |
+67:13:05.6 |
HIP 15765 |
14.00 |
| 2026-10-04 12:00 |
03:25:20.32 |
+67:13:28.8 |
HIP 15765 |
13.20 |
| 2026-10-05 00:00 |
03:25:10.82 |
+67:13:51.6 |
HIP 15765 |
12.42 |
| 2026-10-05 12:00 |
03:25:01.24 |
+67:14:13.9 |
HIP 15765 |
11.67 |
| 2026-10-06 00:00 |
03:24:51.58 |
+67:14:35.8 |
HIP 15765 |
10.95 |
| 2026-10-06 12:00 |
03:24:41.85 |
+67:14:57.3 |
HIP 15765 |
10.27 |
| 2026-10-07 00:00 |
03:24:32.05 |
+67:15:18.3 |
HIP 15765 |
9.63 |
| 2026-10-07 12:00 |
03:24:22.17 |
+67:15:38.9 |
HIP 15765 |
9.05 |
| 2026-10-08 00:00 |
03:24:12.22 |
+67:15:59.0 |
HIP 15765 |
8.55 |
| 2026-10-08 12:00 |
03:24:02.21 |
+67:16:18.6 |
HIP 15765 |
8.13 |
| 2026-10-09 00:00 |
03:23:52.12 |
+67:16:37.8 |
HIP 15765 |
7.82 |
| 2026-10-09 12:00 |
03:23:41.96 |
+67:16:56.6 |
HIP 15765 |
7.62 |
| 2026-10-10 00:00 |
03:23:31.73 |
+67:17:14.9 |
HIP 15765 |
7.55 |
| 2026-10-10 12:00 |
03:23:21.43 |
+67:17:32.7 |
HIP 15765 |
7.61 |
| 2026-10-11 00:00 |
03:23:11.07 |
+67:17:50.0 |
HIP 15765 |
7.80 |