474P/Hogan
| 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) |
| 2026-02-03 00:00 |
14:45:01.83 |
-15:59:13.7 |
HIP 72194 |
34.40 |
| 2026-02-03 12:00 |
14:45:16.56 |
-16:00:25.2 |
HIP 72194 |
34.31 |
| 2026-02-04 00:00 |
14:45:31.07 |
-16:01:35.6 |
HIP 72292 |
34.62 |
| 2026-02-04 12:00 |
14:45:45.35 |
-16:02:45.0 |
HIP 72292 |
31.61 |
| 2026-02-05 00:00 |
14:45:59.42 |
-16:03:53.3 |
HIP 72292 |
28.79 |
| 2026-02-05 12:00 |
14:46:13.26 |
-16:05:00.6 |
HIP 72292 |
26.19 |
| 2026-02-06 00:00 |
14:46:26.87 |
-16:06:06.8 |
HIP 72292 |
23.86 |
| 2026-02-06 12:00 |
14:46:40.25 |
-16:07:12.0 |
HIP 72292 |
21.85 |
| 2026-02-07 00:00 |
14:46:53.41 |
-16:08:16.0 |
HIP 72292 |
20.25 |
| 2026-02-07 12:00 |
14:47:06.33 |
-16:09:19.0 |
HIP 72292 |
19.11 |
| 2026-02-08 00:00 |
14:47:19.02 |
-16:10:20.9 |
HIP 72292 |
18.49 |
| 2026-02-08 12:00 |
14:47:31.48 |
-16:11:21.8 |
HIP 72292 |
18.41 |
| 2026-02-09 00:00 |
14:47:43.70 |
-16:12:21.5 |
HIP 72292 |
18.86 |
| 2026-02-09 12:00 |
14:47:55.68 |
-16:13:20.2 |
HIP 72292 |
19.76 |
| 2026-02-10 00:00 |
14:48:07.42 |
-16:14:17.7 |
HIP 72292 |
21.04 |
| 2026-02-10 12:00 |
14:48:18.92 |
-16:15:14.2 |
HIP 72292 |
22.60 |
| 2026-02-11 00:00 |
14:48:30.18 |
-16:16:09.5 |
HIP 72292 |
24.37 |
| 2026-02-11 12:00 |
14:48:41.20 |
-16:17:03.8 |
HIP 72560 |
22.02 |
| 2026-02-12 00:00 |
14:48:51.97 |
-16:17:56.9 |
HIP 72560 |
19.29 |
| 2026-02-12 12:00 |
14:49:02.50 |
-16:18:48.9 |
HIP 72560 |
16.62 |
| 2026-02-13 00:00 |
14:49:12.77 |
-16:19:39.8 |
HIP 72560 |
14.02 |
| 2026-02-13 12:00 |
14:49:22.80 |
-16:20:29.6 |
HIP 72560 |
11.47 |
| 2026-02-14 00:00 |
14:49:32.58 |
-16:21:18.3 |
HIP 72560 |
8.99 |
| 2026-02-14 12:00 |
14:49:42.10 |
-16:22:05.8 |
HIP 72560 |
6.57 |
| 2026-02-15 00:00 |
14:49:51.37 |
-16:22:52.2 |
HIP 72560 |
4.22 |
| 2026-02-15 12:00 |
14:50:00.38 |
-16:23:37.4 |
HIP 72560 |
1.93 |
| 2026-02-16 00:00 |
14:50:09.14 |
-16:24:21.5 |
HIP 72560 |
0.32 |
| 2026-02-16 12:00 |
14:50:17.64 |
-16:25:04.5 |
HIP 72560 |
2.46 |
| 2026-02-17 00:00 |
14:50:25.88 |
-16:25:46.3 |
HIP 72560 |
4.55 |
| 2026-02-17 12:00 |
14:50:33.86 |
-16:26:27.0 |
HIP 72560 |
6.58 |
| 2026-02-18 00:00 |
14:50:41.57 |
-16:27:06.5 |
HIP 72560 |
8.55 |
| 2026-02-18 12:00 |
14:50:49.03 |
-16:27:44.9 |
HIP 72560 |
10.44 |
| 2026-02-19 00:00 |
14:50:56.22 |
-16:28:22.1 |
HIP 72560 |
12.28 |
| 2026-02-19 12:00 |
14:51:03.14 |
-16:28:58.1 |
HIP 72560 |
14.04 |
| 2026-02-20 00:00 |
14:51:09.80 |
-16:29:33.0 |
HIP 72560 |
15.74 |
| 2026-02-20 12:00 |
14:51:16.19 |
-16:30:06.7 |
HIP 72560 |
17.37 |
| 2026-02-21 00:00 |
14:51:22.31 |
-16:30:39.3 |
HIP 72560 |
18.94 |
| 2026-02-21 12:00 |
14:51:28.17 |
-16:31:10.7 |
HIP 72784 |
18.46 |
| 2026-02-22 00:00 |
14:51:33.75 |
-16:31:40.9 |
HIP 72784 |
17.46 |
| 2026-02-22 12:00 |
14:51:39.06 |
-16:32:09.9 |
HIP 72784 |
16.56 |
| 2026-02-23 00:00 |
14:51:44.10 |
-16:32:37.8 |
HIP 72784 |
15.78 |
| 2026-02-23 12:00 |
14:51:48.87 |
-16:33:04.5 |
HIP 72784 |
15.11 |
| 2026-02-24 00:00 |
14:51:53.36 |
-16:33:30.0 |
HIP 72784 |
14.55 |