| 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
$$
M_a = (14.912 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
Model Parameters
| Parameter |
Value |
| H0 |
14.912 |
| n |
6.000 |
| gf |
0.998 |
| gb |
-0.644 |
| k |
0.847 |
| δ90 |
8.808 |
| 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 |
14:16:37.90 |
-14:03:26.2 |
HIP 69801 |
7.55 |
| 2026-05-12 12:00 |
14:16:16.91 |
-14:01:44.8 |
HIP 69801 |
12.26 |
| 2026-05-13 00:00 |
14:15:56.04 |
-14:00:03.8 |
HIP 69801 |
17.33 |
| 2026-05-13 12:00 |
14:15:35.30 |
-13:58:23.3 |
HIP 69769 |
22.00 |
| 2026-05-14 00:00 |
14:15:14.69 |
-13:56:43.3 |
HIP 69769 |
25.10 |
| 2026-05-14 12:00 |
14:14:54.21 |
-13:55:03.7 |
HIP 69464 |
24.23 |
| 2026-05-15 00:00 |
14:14:33.87 |
-13:53:24.7 |
HIP 69464 |
19.04 |
| 2026-05-15 12:00 |
14:14:13.67 |
-13:51:46.3 |
HIP 69464 |
13.91 |
| 2026-05-16 00:00 |
14:13:53.62 |
-13:50:08.4 |
HIP 69464 |
8.85 |
| 2026-05-16 12:00 |
14:13:33.72 |
-13:48:31.2 |
HIP 69464 |
4.01 |
| 2026-05-17 00:00 |
14:13:13.97 |
-13:46:54.6 |
HIP 69464 |
2.39 |
| 2026-05-17 12:00 |
14:12:54.38 |
-13:45:18.6 |
HIP 69464 |
6.78 |
| 2026-05-18 00:00 |
14:12:34.95 |
-13:43:43.3 |
HIP 69449 |
11.56 |
| 2026-05-18 12:00 |
14:12:15.69 |
-13:42:08.7 |
HIP 69449 |
16.18 |
| 2026-05-19 00:00 |
14:11:56.59 |
-13:40:34.8 |
HIP 69449 |
20.91 |
| 2026-05-19 12:00 |
14:11:37.67 |
-13:39:01.7 |
HIP 69306 |
21.54 |
| 2026-05-20 00:00 |
14:11:18.93 |
-13:37:29.3 |
HIP 69306 |
19.00 |
| 2026-05-20 12:00 |
14:11:00.36 |
-13:35:57.7 |
HIP 69306 |
17.45 |
| 2026-05-21 00:00 |
14:10:41.98 |
-13:34:26.9 |
HIP 69306 |
17.12 |
| 2026-05-21 12:00 |
14:10:23.79 |
-13:32:56.9 |
HIP 69306 |
18.05 |
| 2026-05-22 00:00 |
14:10:05.78 |
-13:31:27.8 |
HIP 69306 |
20.03 |
| 2026-05-22 12:00 |
14:09:47.97 |
-13:29:59.5 |
HIP 69306 |
22.75 |
| 2026-05-23 00:00 |
14:09:30.35 |
-13:28:32.1 |
HIP 69060 |
20.86 |
| 2026-05-23 12:00 |
14:09:12.94 |
-13:27:05.6 |
HIP 69060 |
16.39 |
| 2026-05-24 00:00 |
14:08:55.72 |
-13:25:40.0 |
HIP 69060 |
11.97 |
| 2026-05-24 12:00 |
14:08:38.71 |
-13:24:15.3 |
HIP 69060 |
7.61 |
| 2026-05-25 00:00 |
14:08:21.90 |
-13:22:51.6 |
HIP 69060 |
3.31 |
| 2026-05-25 12:00 |
14:08:05.30 |
-13:21:28.9 |
HIP 69060 |
1.13 |
| 2026-05-26 00:00 |
14:07:48.92 |
-13:20:07.1 |
HIP 69060 |
5.23 |
| 2026-05-26 12:00 |
14:07:32.75 |
-13:18:46.3 |
HIP 69060 |
9.38 |
| 2026-05-27 00:00 |
14:07:16.79 |
-13:17:26.6 |
HIP 69060 |
13.48 |
| 2026-05-27 12:00 |
14:07:01.05 |
-13:16:07.8 |
HIP 69060 |
17.52 |
| 2026-05-28 00:00 |
14:06:45.54 |
-13:14:50.1 |
HIP 68855 |
15.68 |
| 2026-05-28 12:00 |
14:06:30.24 |
-13:13:33.5 |
HIP 68855 |
12.15 |
| 2026-05-29 00:00 |
14:06:15.17 |
-13:12:17.9 |
HIP 68855 |
8.99 |
| 2026-05-29 12:00 |
14:06:00.33 |
-13:11:03.4 |
HIP 68855 |
6.68 |
| 2026-05-30 00:00 |
14:05:45.72 |
-13:09:50.0 |
HIP 68855 |
6.11 |
| 2026-05-30 12:00 |
14:05:31.33 |
-13:08:37.7 |
HIP 68855 |
7.61 |
| 2026-05-31 00:00 |
14:05:17.18 |
-13:07:26.5 |
HIP 68855 |
10.25 |
| 2026-05-31 12:00 |
14:05:03.27 |
-13:06:16.5 |
HIP 68855 |
13.31 |
| 2026-06-01 00:00 |
14:04:49.59 |
-13:05:07.6 |
HIP 68855 |
16.52 |
| 2026-06-01 12:00 |
14:04:36.14 |
-13:03:59.9 |
HIP 68696 |
18.63 |
| 2026-06-02 00:00 |
14:04:22.94 |
-13:02:53.3 |
HIP 68696 |
17.45 |