메타데이터
| 항목 |
값 |
| Designation |
C/2023 X4 (Hogan) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2024-05-24T19:34:19.804800Z |
| Orbit solution date (soln_date, UTC) |
2025-05-08T09:42:16Z |
| Obs used |
102 |
| NEO |
- |
| M1 |
13.200 |
| K1 |
8.000 |
| PC |
- |
| Discovery observation (MPC, UTC) |
2023-12-13T07:58:38.409600Z |
| Discovery magnitude (MPC) |
19.86 G |
| Discovery observatory (MPC) |
G96 · University of Arizona Mt. Lemmon Survey |
Osculating 궤도요소
| 항목 |
값 |
| Epoch (epoch_cal, TDB) |
2024-06-16.0000000 |
| e |
0.63094701 |
| q (au) |
3.657863 |
| a (au) |
9.911484 |
| i (deg) |
11.594709 |
| Ω (om, deg) |
28.764969 |
| ω (w, deg) |
100.553292 |
| M (ma, deg) |
0.700722 |
밝기
산란 + 전체 선형
$$
M_a = (14.631 + 4.372\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
모델 상수
| 항목 |
값 |
| H0 |
14.631 |
| n |
4.372 |
| gf |
0.999 |
| gb |
-0.766 |
| k |
0.800 |
| δ90 |
10.000 |
| 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) |
| 2026-09-20 00:00 |
14:28:23.54 |
-18:06:33.8 |
HIP 70888 |
20.70 |
| 2026-09-20 12:00 |
14:28:41.73 |
-18:08:10.2 |
HIP 70888 |
17.29 |
| 2026-09-21 00:00 |
14:28:59.97 |
-18:09:46.8 |
HIP 70888 |
14.56 |
| 2026-09-21 12:00 |
14:29:18.28 |
-18:11:23.6 |
HIP 70888 |
12.95 |
| 2026-09-22 00:00 |
14:29:36.64 |
-18:13:00.7 |
HIP 70888 |
12.90 |
| 2026-09-22 12:00 |
14:29:55.06 |
-18:14:37.9 |
HIP 70888 |
14.44 |
| 2026-09-23 00:00 |
14:30:13.54 |
-18:16:15.4 |
HIP 70888 |
17.17 |
| 2026-09-23 12:00 |
14:30:32.08 |
-18:17:53.0 |
HIP 70888 |
20.61 |
| 2026-09-24 00:00 |
14:30:50.67 |
-18:19:30.9 |
HIP 70888 |
24.49 |
| 2026-09-24 12:00 |
14:31:09.32 |
-18:21:09.0 |
HIP 70888 |
28.63 |
| 2026-09-25 00:00 |
14:31:28.03 |
-18:22:47.2 |
HIP 71114 |
30.66 |
| 2026-09-25 12:00 |
14:31:46.78 |
-18:24:25.7 |
HIP 71114 |
27.19 |
| 2026-09-26 00:00 |
14:32:05.60 |
-18:26:04.3 |
HIP 71114 |
24.15 |
| 2026-09-26 12:00 |
14:32:24.46 |
-18:27:43.1 |
HIP 71114 |
21.73 |
| 2026-09-27 00:00 |
14:32:43.38 |
-18:29:22.2 |
HIP 71114 |
20.15 |
| 2026-09-27 12:00 |
14:33:02.35 |
-18:31:01.3 |
HIP 71114 |
19.65 |
| 2026-09-28 00:00 |
14:33:21.37 |
-18:32:40.7 |
HIP 71114 |
20.30 |
| 2026-09-28 12:00 |
14:33:40.45 |
-18:34:20.2 |
HIP 71114 |
22.00 |
| 2026-09-29 00:00 |
14:33:59.57 |
-18:36:00.0 |
HIP 71114 |
24.56 |
| 2026-09-29 12:00 |
14:34:18.75 |
-18:37:39.8 |
HIP 71114 |
27.73 |
| 2026-09-30 00:00 |
14:34:37.97 |
-18:39:19.8 |
HIP 71114 |
31.34 |
| 2026-09-30 12:00 |
14:34:57.24 |
-18:41:00.0 |
HIP 71114 |
35.26 |
| 2026-10-01 00:00 |
14:35:16.57 |
-18:42:40.4 |
HIP 71114 |
39.40 |
| 2026-10-01 12:00 |
14:35:35.94 |
-18:44:20.9 |
HIP 71380 |
42.26 |
| 2026-10-02 00:00 |
14:35:55.35 |
-18:46:01.5 |
HIP 71380 |
43.87 |
| 2026-10-02 12:00 |
14:36:14.82 |
-18:47:42.3 |
HIP 71380 |
45.94 |
| 2026-10-03 00:00 |
14:36:34.33 |
-18:49:23.3 |
HIP 71380 |
48.44 |
| 2026-10-03 12:00 |
14:36:53.89 |
-18:51:04.4 |
HIP 71380 |
51.29 |
| 2026-10-04 00:00 |
14:37:13.49 |
-18:52:45.6 |
HIP 71776 |
53.24 |
| 2026-10-04 12:00 |
14:37:33.14 |
-18:54:26.9 |
HIP 71776 |
48.80 |
| 2026-10-05 00:00 |
14:37:52.83 |
-18:56:08.4 |
HIP 71776 |
44.47 |
| 2026-10-05 12:00 |
14:38:12.57 |
-18:57:50.1 |
HIP 71776 |
40.27 |
| 2026-10-06 00:00 |
14:38:32.34 |
-18:59:31.8 |
HIP 71776 |
36.27 |
| 2026-10-06 12:00 |
14:38:52.17 |
-19:01:13.7 |
HIP 71776 |
32.52 |
| 2026-10-07 00:00 |
14:39:12.03 |
-19:02:55.7 |
HIP 71776 |
29.14 |
| 2026-10-07 12:00 |
14:39:31.93 |
-19:04:37.8 |
HIP 71776 |
26.27 |
| 2026-10-08 00:00 |
14:39:51.88 |
-19:06:20.0 |
HIP 71776 |
24.11 |
| 2026-10-08 12:00 |
14:40:11.86 |
-19:08:02.3 |
HIP 71776 |
22.86 |
| 2026-10-09 00:00 |
14:40:31.88 |
-19:09:44.7 |
HIP 71776 |
22.68 |
| 2026-10-09 12:00 |
14:40:51.95 |
-19:11:27.2 |
HIP 71776 |
23.60 |
| 2026-10-10 00:00 |
14:41:12.05 |
-19:13:09.9 |
HIP 71934 |
22.65 |
| 2026-10-10 12:00 |
14:41:32.18 |
-19:14:52.6 |
HIP 71934 |
17.63 |
| 2026-10-11 00:00 |
14:41:52.36 |
-19:16:35.4 |
HIP 71934 |
12.62 |