메타데이터
| 항목 |
값 |
| 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 궤도요소
| 항목 |
값 |
| 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 |
밝기
산란 + 전체 선형
$$
M_a = (14.907 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
14.907 |
| n |
6.000 |
| gf |
0.993 |
| gb |
-0.644 |
| k |
0.848 |
| δ90 |
9.113 |
| 파라미터 |
기호 |
범위 |
설명 |
| 태양·지구거리 1 AU에서의 절대등급 |
H0 |
-5 to 20 |
혜성의 고유 밝기 |
| 광도 기울기 파라미터 |
n |
2 to 6 |
태양거리 변화에 따른 밝기 변화율 |
| 전방 산란 비대칭 계수 |
gf |
0.8 to 1 |
전방 산란의 강도 |
| 후방 산란 비대칭 계수 |
gb |
-1 to -0.5 |
후방 산란의 강도 |
| 분할 계수 |
k |
0.8 to 1 |
전·후방 산란 기여도 비율 |
| 먼지/가스 밝기 비 |
δ90 |
1 to 10 |
코마에서 먼지 산란 대비 가스 방출의 상대 기여 |
참고: EPSC-DPS2025-160
천체력
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-07-29 00:00 |
14:07:18.12 |
-13:21:25.9 |
HIP 69060 |
12.28 |
| 2026-07-29 12:00 |
14:07:33.36 |
-13:22:46.5 |
HIP 69060 |
8.55 |
| 2026-07-30 00:00 |
14:07:48.80 |
-13:24:08.1 |
HIP 69060 |
5.12 |
| 2026-07-30 12:00 |
14:08:04.44 |
-13:25:30.6 |
HIP 69060 |
3.35 |
| 2026-07-31 00:00 |
14:08:20.27 |
-13:26:54.1 |
HIP 69060 |
5.42 |
| 2026-07-31 12:00 |
14:08:36.31 |
-13:28:18.6 |
HIP 69060 |
9.05 |
| 2026-08-01 00:00 |
14:08:52.54 |
-13:29:44.0 |
HIP 69060 |
13.04 |
| 2026-08-01 12:00 |
14:09:08.97 |
-13:31:10.3 |
HIP 69060 |
17.18 |
| 2026-08-02 00:00 |
14:09:25.59 |
-13:32:37.5 |
HIP 69060 |
21.40 |
| 2026-08-02 12:00 |
14:09:42.40 |
-13:34:05.7 |
HIP 69232 |
24.47 |
| 2026-08-03 00:00 |
14:09:59.41 |
-13:35:34.8 |
HIP 69232 |
21.52 |
| 2026-08-03 12:00 |
14:10:16.61 |
-13:37:04.7 |
HIP 69232 |
19.10 |
| 2026-08-04 00:00 |
14:10:34.00 |
-13:38:35.6 |
HIP 69232 |
17.49 |
| 2026-08-04 12:00 |
14:10:51.58 |
-13:40:07.4 |
HIP 69232 |
16.94 |
| 2026-08-05 00:00 |
14:11:09.34 |
-13:41:40.0 |
HIP 69232 |
17.60 |
| 2026-08-05 12:00 |
14:11:27.30 |
-13:43:13.6 |
HIP 69232 |
19.38 |
| 2026-08-06 00:00 |
14:11:45.44 |
-13:44:48.0 |
HIP 69449 |
21.58 |
| 2026-08-06 12:00 |
14:12:03.77 |
-13:46:23.2 |
HIP 69449 |
16.85 |
| 2026-08-07 00:00 |
14:12:22.28 |
-13:47:59.3 |
HIP 69449 |
12.08 |
| 2026-08-07 12:00 |
14:12:40.98 |
-13:49:36.2 |
HIP 69449 |
7.27 |
| 2026-08-08 00:00 |
14:12:59.86 |
-13:51:14.0 |
HIP 69449 |
2.44 |
| 2026-08-08 12:00 |
14:13:18.93 |
-13:52:52.6 |
HIP 69449 |
2.56 |
| 2026-08-09 00:00 |
14:13:38.17 |
-13:54:32.1 |
HIP 69464 |
7.38 |
| 2026-08-09 12:00 |
14:13:57.60 |
-13:56:12.3 |
HIP 69464 |
12.04 |
| 2026-08-10 00:00 |
14:14:17.21 |
-13:57:53.4 |
HIP 69464 |
16.94 |
| 2026-08-10 12:00 |
14:14:36.99 |
-13:59:35.2 |
HIP 69464 |
21.95 |
| 2026-08-11 00:00 |
14:14:56.96 |
-14:01:17.8 |
HIP 69464 |
27.04 |
| 2026-08-11 12:00 |
14:15:17.10 |
-14:03:01.3 |
HIP 69801 |
26.82 |
| 2026-08-12 00:00 |
14:15:37.42 |
-14:04:45.5 |
HIP 69801 |
22.14 |
| 2026-08-12 12:00 |
14:15:57.91 |
-14:06:30.4 |
HIP 69801 |
17.72 |
| 2026-08-13 00:00 |
14:16:18.58 |
-14:08:16.1 |
HIP 69801 |
13.89 |
| 2026-08-13 12:00 |
14:16:39.41 |
-14:10:02.6 |
HIP 69801 |
11.30 |
| 2026-08-14 00:00 |
14:17:00.43 |
-14:11:49.7 |
HIP 69801 |
10.96 |
| 2026-08-14 12:00 |
14:17:21.61 |
-14:13:37.7 |
HIP 69801 |
13.09 |
| 2026-08-15 00:00 |
14:17:42.96 |
-14:15:26.3 |
HIP 69801 |
16.82 |
| 2026-08-15 12:00 |
14:18:04.48 |
-14:17:15.6 |
HIP 69987 |
18.51 |
| 2026-08-16 00:00 |
14:18:26.17 |
-14:19:05.7 |
HIP 69987 |
12.96 |
| 2026-08-16 12:00 |
14:18:48.03 |
-14:20:56.4 |
HIP 69987 |
7.40 |
| 2026-08-17 00:00 |
14:19:10.05 |
-14:22:47.8 |
HIP 69987 |
2.04 |
| 2026-08-17 12:00 |
14:19:32.23 |
-14:24:39.9 |
HIP 69987 |
4.21 |
| 2026-08-18 00:00 |
14:19:54.58 |
-14:26:32.6 |
HIP 69987 |
9.83 |
| 2026-08-18 12:00 |
14:20:17.09 |
-14:28:26.0 |
HIP 69987 |
15.57 |
| 2026-08-19 00:00 |
14:20:39.76 |
-14:30:20.0 |
HIP 69987 |
21.37 |