| Parameter |
Value |
| Designation |
72P/Denning-Fujikawa |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2014-07-12T06:43:54.975360Z |
| Orbit solution date (soln_date, UTC) |
2023-11-14T12:33:10Z |
| Obs used |
66 |
| NEO |
Yes |
| M1 |
17.500 |
| K1 |
19.000 |
| PC |
0.030 |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2015-09-21.0000000 |
| e |
0.82045974 |
| q (au) |
0.780529 |
| a (au) |
4.347375 |
| i (deg) |
9.232915 |
| Ω (om, deg) |
35.435635 |
| ω (w, deg) |
338.472965 |
| M (ma, deg) |
47.377307 |
Magnitude
Scatter + Global Linear
$$
M_a = (17.746 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
17.746 |
| n |
6.000 |
| gf |
0.998 |
| gb |
-1.000 |
| k |
0.871 |
| 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 |
11:51:47.23 |
+06:21:17.4 |
HIP 57769 |
14.54 |
| 2026-05-12 12:00 |
11:51:40.00 |
+06:21:35.1 |
HIP 57769 |
12.76 |
| 2026-05-13 00:00 |
11:51:32.90 |
+06:21:52.0 |
HIP 57769 |
11.03 |
| 2026-05-13 12:00 |
11:51:25.93 |
+06:22:08.0 |
HIP 57769 |
9.35 |
| 2026-05-14 00:00 |
11:51:19.10 |
+06:22:23.0 |
HIP 57769 |
7.72 |
| 2026-05-14 12:00 |
11:51:12.39 |
+06:22:37.2 |
HIP 57769 |
6.17 |
| 2026-05-15 00:00 |
11:51:05.82 |
+06:22:50.4 |
HIP 57769 |
4.74 |
| 2026-05-15 12:00 |
11:50:59.37 |
+06:23:02.8 |
HIP 57769 |
3.52 |
| 2026-05-16 00:00 |
11:50:53.06 |
+06:23:14.2 |
HIP 57769 |
2.74 |
| 2026-05-16 12:00 |
11:50:46.88 |
+06:23:24.8 |
HIP 57769 |
2.74 |
| 2026-05-17 00:00 |
11:50:40.84 |
+06:23:34.4 |
HIP 57769 |
3.47 |
| 2026-05-17 12:00 |
11:50:34.93 |
+06:23:43.2 |
HIP 57769 |
4.57 |
| 2026-05-18 00:00 |
11:50:29.15 |
+06:23:51.0 |
HIP 57769 |
5.79 |
| 2026-05-18 12:00 |
11:50:23.50 |
+06:23:58.0 |
HIP 57769 |
7.07 |
| 2026-05-19 00:00 |
11:50:17.99 |
+06:24:04.0 |
HIP 57769 |
8.35 |
| 2026-05-19 12:00 |
11:50:12.62 |
+06:24:09.2 |
HIP 57769 |
9.62 |
| 2026-05-20 00:00 |
11:50:07.37 |
+06:24:13.4 |
HIP 57676 |
9.14 |
| 2026-05-20 12:00 |
11:50:02.26 |
+06:24:16.8 |
HIP 57676 |
8.37 |
| 2026-05-21 00:00 |
11:49:57.29 |
+06:24:19.3 |
HIP 57676 |
7.75 |
| 2026-05-21 12:00 |
11:49:52.45 |
+06:24:20.9 |
HIP 57676 |
7.32 |
| 2026-05-22 00:00 |
11:49:47.74 |
+06:24:21.6 |
HIP 57676 |
7.09 |
| 2026-05-22 12:00 |
11:49:43.17 |
+06:24:21.5 |
HIP 57676 |
7.06 |
| 2026-05-23 00:00 |
11:49:38.73 |
+06:24:20.4 |
HIP 57676 |
7.22 |
| 2026-05-23 12:00 |
11:49:34.43 |
+06:24:18.5 |
HIP 57676 |
7.54 |
| 2026-05-24 00:00 |
11:49:30.26 |
+06:24:15.7 |
HIP 57676 |
7.99 |
| 2026-05-24 12:00 |
11:49:26.22 |
+06:24:12.1 |
HIP 57676 |
8.53 |
| 2026-05-25 00:00 |
11:49:22.32 |
+06:24:07.6 |
HIP 57676 |
9.15 |
| 2026-05-25 12:00 |
11:49:18.55 |
+06:24:02.2 |
HIP 57676 |
9.81 |
| 2026-05-26 00:00 |
11:49:14.92 |
+06:23:55.9 |
HIP 57676 |
10.50 |
| 2026-05-26 12:00 |
11:49:11.41 |
+06:23:48.8 |
HIP 57676 |
11.21 |
| 2026-05-27 00:00 |
11:49:08.05 |
+06:23:40.9 |
HIP 57676 |
11.92 |
| 2026-05-27 12:00 |
11:49:04.81 |
+06:23:32.1 |
HIP 57676 |
12.64 |
| 2026-05-28 00:00 |
11:49:01.71 |
+06:23:22.4 |
HIP 57676 |
13.35 |
| 2026-05-28 12:00 |
11:48:58.74 |
+06:23:12.0 |
HIP 57676 |
14.04 |
| 2026-05-29 00:00 |
11:48:55.90 |
+06:23:00.6 |
HIP 57676 |
14.73 |
| 2026-05-29 12:00 |
11:48:53.20 |
+06:22:48.4 |
HIP 57676 |
15.40 |
| 2026-05-30 00:00 |
11:48:50.63 |
+06:22:35.4 |
HIP 57676 |
16.05 |
| 2026-05-30 12:00 |
11:48:48.18 |
+06:22:21.6 |
HIP 57676 |
16.68 |
| 2026-05-31 00:00 |
11:48:45.88 |
+06:22:06.9 |
HIP 57676 |
17.30 |
| 2026-05-31 12:00 |
11:48:43.70 |
+06:21:51.4 |
HIP 57676 |
17.89 |
| 2026-06-01 00:00 |
11:48:41.65 |
+06:21:35.1 |
HIP 57676 |
18.47 |
| 2026-06-01 12:00 |
11:48:39.74 |
+06:21:18.0 |
HIP 57676 |
19.02 |
| 2026-06-02 00:00 |
11:48:37.96 |
+06:21:00.0 |
HIP 57676 |
19.56 |