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) |
| 2026-07-29 00:00 |
14:04:10.36 |
-15:50:51.8 |
HIP 68729 |
21.71 |
| 2026-07-29 12:00 |
14:04:18.49 |
-15:51:42.3 |
HIP 68729 |
22.69 |
| 2026-07-30 00:00 |
14:04:26.74 |
-15:52:33.5 |
HIP 68729 |
23.84 |
| 2026-07-30 12:00 |
14:04:35.12 |
-15:53:25.3 |
HIP 68729 |
25.15 |
| 2026-07-31 00:00 |
14:04:43.63 |
-15:54:17.7 |
HIP 68729 |
26.58 |
| 2026-07-31 12:00 |
14:04:52.27 |
-15:55:10.7 |
HIP 68808 |
25.52 |
| 2026-08-01 00:00 |
14:05:01.03 |
-15:56:04.3 |
HIP 68808 |
24.29 |
| 2026-08-01 12:00 |
14:05:09.91 |
-15:56:58.5 |
HIP 68808 |
23.20 |
| 2026-08-02 00:00 |
14:05:18.92 |
-15:57:53.3 |
HIP 68900 |
21.64 |
| 2026-08-02 12:00 |
14:05:28.05 |
-15:58:48.7 |
HIP 68900 |
19.43 |
| 2026-08-03 00:00 |
14:05:37.30 |
-15:59:44.8 |
HIP 68900 |
17.24 |
| 2026-08-03 12:00 |
14:05:46.68 |
-16:00:41.4 |
HIP 68900 |
15.09 |
| 2026-08-04 00:00 |
14:05:56.18 |
-16:01:38.6 |
HIP 68900 |
13.02 |
| 2026-08-04 12:00 |
14:06:05.80 |
-16:02:36.4 |
HIP 68900 |
11.09 |
| 2026-08-05 00:00 |
14:06:15.54 |
-16:03:34.8 |
HIP 68900 |
9.42 |
| 2026-08-05 12:00 |
14:06:25.40 |
-16:04:33.7 |
HIP 68900 |
8.20 |
| 2026-08-06 00:00 |
14:06:35.39 |
-16:05:33.2 |
HIP 68900 |
7.67 |
| 2026-08-06 12:00 |
14:06:45.49 |
-16:06:33.4 |
HIP 68900 |
8.00 |
| 2026-08-07 00:00 |
14:06:55.71 |
-16:07:34.1 |
HIP 68970 |
5.82 |
| 2026-08-07 12:00 |
14:07:06.04 |
-16:08:35.3 |
HIP 68970 |
3.40 |
| 2026-08-08 00:00 |
14:07:16.50 |
-16:09:37.1 |
HIP 68970 |
1.92 |
| 2026-08-08 12:00 |
14:07:27.07 |
-16:10:39.5 |
HIP 68970 |
3.26 |
| 2026-08-09 00:00 |
14:07:37.76 |
-16:11:42.5 |
HIP 68970 |
5.74 |
| 2026-08-09 12:00 |
14:07:48.56 |
-16:12:46.0 |
HIP 68970 |
8.44 |
| 2026-08-10 00:00 |
14:07:59.48 |
-16:13:50.1 |
HIP 68970 |
11.21 |
| 2026-08-10 12:00 |
14:08:10.52 |
-16:14:54.7 |
HIP 68970 |
14.04 |
| 2026-08-11 00:00 |
14:08:21.67 |
-16:15:59.8 |
HIP 68970 |
16.90 |
| 2026-08-11 12:00 |
14:08:32.93 |
-16:17:05.6 |
HIP 69073 |
17.48 |
| 2026-08-12 00:00 |
14:08:44.30 |
-16:18:11.8 |
HIP 69073 |
17.06 |
| 2026-08-12 12:00 |
14:08:55.79 |
-16:19:18.6 |
HIP 69073 |
17.16 |
| 2026-08-13 00:00 |
14:09:07.39 |
-16:20:25.9 |
HIP 69073 |
17.77 |
| 2026-08-13 12:00 |
14:09:19.10 |
-16:21:33.8 |
HIP 69073 |
18.85 |
| 2026-08-14 00:00 |
14:09:30.92 |
-16:22:42.2 |
HIP 69269 |
19.63 |
| 2026-08-14 12:00 |
14:09:42.85 |
-16:23:51.0 |
HIP 69269 |
17.21 |
| 2026-08-15 00:00 |
14:09:54.89 |
-16:25:00.5 |
HIP 69269 |
15.01 |
| 2026-08-15 12:00 |
14:10:07.04 |
-16:26:10.4 |
HIP 69269 |
13.17 |
| 2026-08-16 00:00 |
14:10:19.29 |
-16:27:20.8 |
HIP 69269 |
11.88 |
| 2026-08-16 12:00 |
14:10:31.65 |
-16:28:31.8 |
HIP 69269 |
11.35 |
| 2026-08-17 00:00 |
14:10:44.12 |
-16:29:43.2 |
HIP 69269 |
11.70 |
| 2026-08-17 12:00 |
14:10:56.69 |
-16:30:55.1 |
HIP 69269 |
12.88 |
| 2026-08-18 00:00 |
14:11:09.37 |
-16:32:07.6 |
HIP 69269 |
14.72 |
| 2026-08-18 12:00 |
14:11:22.15 |
-16:33:20.5 |
HIP 69269 |
17.01 |
| 2026-08-19 00:00 |
14:11:35.03 |
-16:34:33.9 |
HIP 69269 |
19.61 |