| Parameter |
Value |
| Designation |
474P/Hogan |
| Type |
P |
| Perihelion (tp_cal, UTC) |
2023-07-19T01:46:21.910080Z |
| Orbit solution date (soln_date, UTC) |
2024-02-21T22:34:49Z |
| Obs used |
120 |
| NEO |
- |
| M1 |
14.700 |
| K1 |
13.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2017-07-30T13:58:23.462400Z |
| Discovery magnitude (MPC) |
23.43 G |
| Discovery observatory (MPC) |
F51 · Pan-STARRS 1, Haleakala |
Osculating Elements
| Parameter |
Value |
| Epoch (epoch_cal, TDB) |
2021-10-01.0000000 |
| e |
0.18866770 |
| q (au) |
2.538985 |
| a (au) |
3.129402 |
| i (deg) |
1.099891 |
| Ω (om, deg) |
26.750354 |
| ω (w, deg) |
12.093477 |
| M (ma, deg) |
243.194094 |
Magnitude
Scatter + Global Linear
$$
M_a = (14.907 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
14.907 |
| n |
6.000 |
| gf |
0.993 |
| gb |
-0.644 |
| k |
0.848 |
| δ90 |
9.113 |
| 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 |
14:49:45.20 |
-16:48:10.6 |
HIP 72560 |
24.40 |
| 2026-09-20 12:00 |
14:50:16.53 |
-16:50:29.6 |
HIP 72560 |
26.19 |
| 2026-09-21 00:00 |
14:50:47.96 |
-16:52:48.7 |
HIP 72699 |
28.85 |
| 2026-09-21 12:00 |
14:51:19.50 |
-16:55:08.0 |
HIP 72699 |
23.65 |
| 2026-09-22 00:00 |
14:51:51.14 |
-16:57:27.4 |
HIP 72699 |
20.27 |
| 2026-09-22 12:00 |
14:52:22.89 |
-16:59:47.0 |
HIP 72699 |
19.69 |
| 2026-09-23 00:00 |
14:52:54.74 |
-17:02:06.6 |
HIP 72699 |
22.16 |
| 2026-09-23 12:00 |
14:53:26.70 |
-17:04:26.3 |
HIP 72699 |
26.87 |
| 2026-09-24 00:00 |
14:53:58.76 |
-17:06:46.1 |
HIP 72699 |
32.89 |
| 2026-09-24 12:00 |
14:54:30.92 |
-17:09:06.1 |
HIP 73097 |
33.49 |
| 2026-09-25 00:00 |
14:55:03.19 |
-17:11:26.0 |
HIP 73097 |
29.72 |
| 2026-09-25 12:00 |
14:55:35.56 |
-17:13:46.1 |
HIP 73097 |
27.82 |
| 2026-09-26 00:00 |
14:56:08.02 |
-17:16:06.3 |
HIP 73097 |
28.21 |
| 2026-09-26 12:00 |
14:56:40.59 |
-17:18:26.5 |
HIP 73238 |
20.50 |
| 2026-09-27 00:00 |
14:57:13.26 |
-17:20:46.7 |
HIP 73238 |
12.46 |
| 2026-09-27 12:00 |
14:57:46.03 |
-17:23:07.0 |
HIP 73238 |
4.77 |
| 2026-09-28 00:00 |
14:58:18.90 |
-17:25:27.4 |
HIP 73238 |
4.85 |
| 2026-09-28 12:00 |
14:58:51.86 |
-17:27:47.8 |
HIP 73262 |
8.77 |
| 2026-09-29 00:00 |
14:59:24.92 |
-17:30:08.2 |
HIP 73290 |
14.76 |
| 2026-09-29 12:00 |
14:59:58.08 |
-17:32:28.7 |
HIP 73290 |
19.94 |
| 2026-09-30 00:00 |
15:00:31.34 |
-17:34:49.1 |
HIP 73290 |
26.73 |
| 2026-09-30 12:00 |
15:01:04.69 |
-17:37:09.6 |
HIP 73636 |
29.02 |
| 2026-10-01 00:00 |
15:01:38.14 |
-17:39:30.1 |
HIP 73636 |
21.09 |
| 2026-10-01 12:00 |
15:02:11.69 |
-17:41:50.7 |
HIP 73636 |
13.60 |
| 2026-10-02 00:00 |
15:02:45.32 |
-17:44:11.2 |
HIP 73636 |
7.99 |
| 2026-10-02 12:00 |
15:03:19.06 |
-17:46:31.7 |
HIP 73636 |
9.07 |
| 2026-10-03 00:00 |
15:03:52.89 |
-17:48:52.1 |
HIP 73751 |
10.51 |
| 2026-10-03 12:00 |
15:04:26.81 |
-17:51:12.6 |
HIP 73751 |
3.16 |
| 2026-10-04 00:00 |
15:05:00.82 |
-17:53:33.1 |
HIP 73753 |
6.73 |
| 2026-10-04 12:00 |
15:05:34.93 |
-17:55:53.5 |
HIP 73753 |
14.91 |
| 2026-10-05 00:00 |
15:06:09.13 |
-17:58:13.8 |
HIP 73753 |
23.29 |
| 2026-10-05 12:00 |
15:06:43.42 |
-18:00:34.2 |
HIP 73753 |
31.74 |
| 2026-10-06 00:00 |
15:07:17.80 |
-18:02:54.5 |
HIP 74172 |
29.15 |
| 2026-10-06 12:00 |
15:07:52.27 |
-18:05:14.7 |
HIP 74172 |
21.33 |
| 2026-10-07 00:00 |
15:08:26.83 |
-18:07:34.8 |
HIP 74172 |
14.33 |
| 2026-10-07 12:00 |
15:09:01.48 |
-18:09:54.9 |
HIP 74172 |
10.05 |
| 2026-10-08 00:00 |
15:09:36.22 |
-18:12:15.0 |
HIP 74172 |
11.98 |
| 2026-10-08 12:00 |
15:10:11.05 |
-18:14:34.9 |
HIP 74232 |
11.16 |
| 2026-10-09 00:00 |
15:10:45.96 |
-18:16:54.7 |
HIP 74232 |
15.79 |
| 2026-10-09 12:00 |
15:11:20.96 |
-18:19:14.5 |
HIP 74310 |
18.51 |
| 2026-10-10 00:00 |
15:11:56.05 |
-18:21:34.1 |
HIP 74412 |
17.69 |
| 2026-10-10 12:00 |
15:12:31.22 |
-18:23:53.7 |
HIP 74412 |
18.54 |
| 2026-10-11 00:00 |
15:13:06.48 |
-18:26:13.1 |
HIP 74593 |
19.39 |