| 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 |
1.000 |
| 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) |
| 2026-09-20 00:00 |
12:20:46.62 |
+01:40:07.6 |
HIP 60190 |
9.76 |
| 2026-09-20 12:00 |
12:21:01.22 |
+01:38:25.1 |
HIP 60190 |
10.14 |
| 2026-09-21 00:00 |
12:21:15.83 |
+01:36:42.7 |
HIP 60190 |
11.96 |
| 2026-09-21 12:00 |
12:21:30.45 |
+01:35:00.3 |
HIP 60190 |
14.69 |
| 2026-09-22 00:00 |
12:21:45.08 |
+01:33:18.0 |
HIP 60190 |
17.92 |
| 2026-09-22 12:00 |
12:21:59.72 |
+01:31:35.8 |
HIP 60190 |
21.42 |
| 2026-09-23 00:00 |
12:22:14.36 |
+01:29:53.7 |
HIP 60456 |
21.09 |
| 2026-09-23 12:00 |
12:22:29.01 |
+01:28:11.6 |
HIP 60456 |
17.67 |
| 2026-09-24 00:00 |
12:22:43.67 |
+01:26:29.6 |
HIP 60456 |
14.56 |
| 2026-09-24 12:00 |
12:22:58.33 |
+01:24:47.7 |
HIP 60456 |
12.01 |
| 2026-09-25 00:00 |
12:23:13.00 |
+01:23:05.9 |
HIP 60456 |
10.45 |
| 2026-09-25 12:00 |
12:23:27.67 |
+01:21:24.1 |
HIP 60456 |
10.33 |
| 2026-09-26 00:00 |
12:23:42.34 |
+01:19:42.5 |
HIP 60456 |
11.70 |
| 2026-09-26 12:00 |
12:23:57.02 |
+01:18:00.9 |
HIP 60544 |
12.02 |
| 2026-09-27 00:00 |
12:24:11.70 |
+01:16:19.4 |
HIP 60544 |
9.88 |
| 2026-09-27 12:00 |
12:24:26.38 |
+01:14:38.1 |
HIP 60544 |
9.13 |
| 2026-09-28 00:00 |
12:24:41.07 |
+01:12:56.8 |
HIP 60544 |
10.09 |
| 2026-09-28 12:00 |
12:24:55.75 |
+01:11:15.7 |
HIP 60632 |
11.41 |
| 2026-09-29 00:00 |
12:25:10.44 |
+01:09:34.6 |
HIP 60632 |
9.71 |
| 2026-09-29 12:00 |
12:25:25.12 |
+01:07:53.7 |
HIP 60632 |
9.54 |
| 2026-09-30 00:00 |
12:25:39.81 |
+01:06:12.9 |
HIP 60632 |
10.96 |
| 2026-09-30 12:00 |
12:25:54.49 |
+01:04:32.2 |
HIP 60632 |
13.48 |
| 2026-10-01 00:00 |
12:26:09.17 |
+01:02:51.6 |
HIP 60632 |
16.61 |
| 2026-10-01 12:00 |
12:26:23.85 |
+01:01:11.2 |
HIP 60632 |
20.07 |
| 2026-10-02 00:00 |
12:26:38.53 |
+00:59:30.9 |
HIP 60632 |
23.70 |
| 2026-10-02 12:00 |
12:26:53.21 |
+00:57:50.7 |
HIP 60632 |
27.45 |
| 2026-10-03 00:00 |
12:27:07.88 |
+00:56:10.6 |
HIP 60688 |
28.33 |
| 2026-10-03 12:00 |
12:27:22.55 |
+00:54:30.7 |
HIP 60902 |
27.08 |
| 2026-10-04 00:00 |
12:27:37.21 |
+00:52:51.0 |
HIP 60902 |
25.08 |
| 2026-10-04 12:00 |
12:27:51.87 |
+00:51:11.4 |
HIP 60902 |
23.62 |
| 2026-10-05 00:00 |
12:28:06.52 |
+00:49:31.9 |
HIP 60902 |
22.77 |
| 2026-10-05 12:00 |
12:28:21.16 |
+00:47:52.7 |
HIP 60902 |
22.61 |
| 2026-10-06 00:00 |
12:28:35.80 |
+00:46:13.5 |
HIP 60902 |
23.16 |
| 2026-10-06 12:00 |
12:28:50.43 |
+00:44:34.6 |
HIP 60902 |
24.37 |
| 2026-10-07 00:00 |
12:29:05.05 |
+00:42:55.8 |
HIP 61030 |
22.54 |
| 2026-10-07 12:00 |
12:29:19.66 |
+00:41:17.2 |
HIP 61030 |
18.54 |
| 2026-10-08 00:00 |
12:29:34.26 |
+00:39:38.8 |
HIP 61030 |
14.54 |
| 2026-10-08 12:00 |
12:29:48.85 |
+00:38:00.5 |
HIP 61030 |
10.55 |
| 2026-10-09 00:00 |
12:30:03.43 |
+00:36:22.4 |
HIP 61030 |
6.58 |
| 2026-10-09 12:00 |
12:30:18.00 |
+00:34:44.6 |
HIP 61030 |
2.67 |
| 2026-10-10 00:00 |
12:30:32.56 |
+00:33:06.9 |
HIP 61030 |
1.67 |
| 2026-10-10 12:00 |
12:30:47.10 |
+00:31:29.5 |
HIP 61030 |
5.49 |
| 2026-10-11 00:00 |
12:31:01.63 |
+00:29:52.2 |
HIP 61030 |
9.44 |