| 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) |
| 2026-06-01 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 |
| 2026-06-02 12:00 |
03:20:30.84 |
+64:29:12.2 |
HIP 15321 |
25.09 |
| 2026-06-03 00:00 |
03:20:39.91 |
+64:29:36.7 |
HIP 15321 |
26.09 |
| 2026-06-03 12:00 |
03:20:48.95 |
+64:30:01.5 |
HIP 15890 |
25.41 |
| 2026-06-04 00:00 |
03:20:57.97 |
+64:30:26.6 |
HIP 15890 |
24.38 |
| 2026-06-04 12:00 |
03:21:06.96 |
+64:30:52.0 |
HIP 15890 |
23.34 |
| 2026-06-05 00:00 |
03:21:15.93 |
+64:31:17.7 |
HIP 15890 |
22.32 |
| 2026-06-05 12:00 |
03:21:24.87 |
+64:31:43.8 |
HIP 15890 |
21.30 |
| 2026-06-06 00:00 |
03:21:33.77 |
+64:32:10.1 |
HIP 15890 |
20.28 |
| 2026-06-06 12:00 |
03:21:42.66 |
+64:32:36.8 |
HIP 15890 |
19.27 |
| 2026-06-07 00:00 |
03:21:51.51 |
+64:33:03.8 |
HIP 15890 |
18.27 |
| 2026-06-07 12:00 |
03:22:00.33 |
+64:33:31.1 |
HIP 15890 |
17.28 |
| 2026-06-08 00:00 |
03:22:09.12 |
+64:33:58.7 |
HIP 15890 |
16.30 |
| 2026-06-08 12:00 |
03:22:17.88 |
+64:34:26.6 |
HIP 15890 |
15.33 |
| 2026-06-09 00:00 |
03:22:26.61 |
+64:34:54.8 |
HIP 15890 |
14.37 |
| 2026-06-09 12:00 |
03:22:35.31 |
+64:35:23.3 |
HIP 15890 |
13.44 |
| 2026-06-10 00:00 |
03:22:43.98 |
+64:35:52.1 |
HIP 15890 |
12.53 |
| 2026-06-10 12:00 |
03:22:52.61 |
+64:36:21.2 |
HIP 15890 |
11.64 |
| 2026-06-11 00:00 |
03:23:01.21 |
+64:36:50.6 |
HIP 15890 |
10.79 |
| 2026-06-11 12:00 |
03:23:09.77 |
+64:37:20.2 |
HIP 15890 |
9.97 |
| 2026-06-12 00:00 |
03:23:18.30 |
+64:37:50.2 |
HIP 15890 |
9.22 |
| 2026-06-12 12:00 |
03:23:26.80 |
+64:38:20.5 |
HIP 15890 |
8.52 |
| 2026-06-13 00:00 |
03:23:35.26 |
+64:38:51.1 |
HIP 15896 |
7.91 |
| 2026-06-13 12:00 |
03:23:43.68 |
+64:39:21.9 |
HIP 15896 |
6.89 |
| 2026-06-14 00:00 |
03:23:52.07 |
+64:39:53.0 |
HIP 15896 |
5.88 |
| 2026-06-14 12:00 |
03:24:00.41 |
+64:40:24.5 |
HIP 15896 |
4.90 |
| 2026-06-15 00:00 |
03:24:08.72 |
+64:40:56.2 |
HIP 15896 |
3.94 |
| 2026-06-15 12:00 |
03:24:16.99 |
+64:41:28.1 |
HIP 15896 |
3.03 |
| 2026-06-16 00:00 |
03:24:25.22 |
+64:42:00.4 |
HIP 15896 |
2.24 |
| 2026-06-16 12:00 |
03:24:33.41 |
+64:42:32.9 |
HIP 15896 |
1.73 |
| 2026-06-17 00:00 |
03:24:41.56 |
+64:43:05.7 |
HIP 15896 |
1.77 |
| 2026-06-17 12:00 |
03:24:49.67 |
+64:43:38.8 |
HIP 15896 |
2.32 |
| 2026-06-18 00:00 |
03:24:57.74 |
+64:44:12.2 |
HIP 15896 |
3.13 |
| 2026-06-18 12:00 |
03:25:05.76 |
+64:44:45.8 |
HIP 15896 |
4.04 |
| 2026-06-19 00:00 |
03:25:13.74 |
+64:45:19.6 |
HIP 15896 |
4.99 |
| 2026-06-19 12:00 |
03:25:21.68 |
+64:45:53.8 |
HIP 15896 |
5.96 |
| 2026-06-20 00:00 |
03:25:29.57 |
+64:46:28.2 |
HIP 15896 |
6.95 |
| 2026-06-20 12:00 |
03:25:37.42 |
+64:47:02.8 |
HIP 15896 |
7.95 |
| 2026-06-21 00:00 |
03:25:45.23 |
+64:47:37.7 |
HIP 15896 |
8.95 |
| 2026-06-21 12:00 |
03:25:52.99 |
+64:48:12.9 |
HIP 15896 |
9.95 |
| 2026-06-22 00:00 |
03:26:00.70 |
+64:48:48.3 |
HIP 15896 |
10.95 |