メタデータ
| 項目 |
値 |
| 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 · Mt. Lemmon Survey |
オスキュレーティング軌道要素
| 項目 |
値 |
| 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 |
等級
散乱 + 全体線形
$$
M_a = (14.631 + 4.372\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
14.631 |
| n |
4.372 |
| gf |
1.000 |
| gb |
-0.766 |
| k |
0.800 |
| δ90 |
10.000 |
| パラメータ |
記号 |
範囲 |
説明 |
| 太陽・地球距離が1 AUのときの絶対等級 |
H0 |
-5 to 20 |
彗星の固有の明るさ |
| 測光スロープパラメータ |
n |
2 to 6 |
太陽距離に対する明るさ変化率 |
| 前方散乱非対称係数 |
gf |
0.8 to 1 |
前方散乱の強さ |
| 後方散乱非対称係数 |
gb |
-1 to -0.5 |
後方散乱の強さ |
| 分配係数 |
k |
0.8 to 1 |
前方/後方散乱の寄与比 |
| ダスト/ガス明るさ比 |
δ90 |
1 to 10 |
ダスト散乱とガス放射の相対寄与 |
参考: EPSC-DPS2025-160
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-03-26 00:00 |
14:33:51.33 |
-16:46:59.0 |
HIP 71234 |
3.69 |
| 2026-03-26 12:00 |
14:33:40.70 |
-16:46:47.1 |
HIP 71234 |
6.01 |
| 2026-03-27 00:00 |
14:33:29.95 |
-16:46:34.4 |
HIP 71234 |
8.50 |
| 2026-03-27 12:00 |
14:33:19.07 |
-16:46:21.1 |
HIP 71234 |
11.06 |
| 2026-03-28 00:00 |
14:33:08.06 |
-16:46:07.2 |
HIP 71234 |
13.67 |
| 2026-03-28 12:00 |
14:32:56.93 |
-16:45:52.5 |
HIP 71234 |
16.33 |
| 2026-03-29 00:00 |
14:32:45.68 |
-16:45:37.2 |
HIP 71234 |
19.02 |
| 2026-03-29 12:00 |
14:32:34.31 |
-16:45:21.2 |
HIP 71234 |
21.75 |
| 2026-03-30 00:00 |
14:32:22.82 |
-16:45:04.6 |
HIP 71063 |
24.11 |
| 2026-03-30 12:00 |
14:32:11.21 |
-16:44:47.4 |
HIP 71063 |
23.28 |
| 2026-03-31 00:00 |
14:31:59.49 |
-16:44:29.5 |
HIP 71063 |
22.75 |
| 2026-03-31 12:00 |
14:31:47.65 |
-16:44:11.0 |
HIP 71063 |
22.55 |
| 2026-04-01 00:00 |
14:31:35.71 |
-16:43:51.8 |
HIP 71063 |
22.72 |
| 2026-04-01 12:00 |
14:31:23.65 |
-16:43:32.1 |
HIP 71063 |
23.24 |
| 2026-04-02 00:00 |
14:31:11.49 |
-16:43:11.7 |
HIP 71063 |
24.10 |
| 2026-04-02 12:00 |
14:30:59.22 |
-16:42:50.7 |
HIP 71063 |
25.29 |
| 2026-04-03 00:00 |
14:30:46.85 |
-16:42:29.1 |
HIP 71063 |
26.76 |
| 2026-04-03 12:00 |
14:30:34.38 |
-16:42:06.9 |
HIP 71063 |
28.47 |
| 2026-04-04 00:00 |
14:30:21.80 |
-16:41:44.1 |
HIP 70795 |
28.88 |
| 2026-04-04 12:00 |
14:30:09.13 |
-16:41:20.7 |
HIP 70795 |
26.66 |
| 2026-04-05 00:00 |
14:29:56.37 |
-16:40:56.8 |
HIP 70795 |
24.60 |
| 2026-04-05 12:00 |
14:29:43.51 |
-16:40:32.2 |
HIP 70795 |
22.78 |
| 2026-04-06 00:00 |
14:29:30.56 |
-16:40:07.1 |
HIP 70795 |
21.25 |
| 2026-04-06 12:00 |
14:29:17.52 |
-16:39:41.4 |
HIP 70795 |
20.09 |
| 2026-04-07 00:00 |
14:29:04.39 |
-16:39:15.2 |
HIP 70795 |
19.38 |
| 2026-04-07 12:00 |
14:28:51.17 |
-16:38:48.4 |
HIP 70795 |
19.18 |
| 2026-04-08 00:00 |
14:28:37.88 |
-16:38:21.1 |
HIP 70795 |
19.52 |
| 2026-04-08 12:00 |
14:28:24.50 |
-16:37:53.3 |
HIP 70795 |
20.38 |
| 2026-04-09 00:00 |
14:28:11.04 |
-16:37:24.9 |
HIP 70795 |
21.71 |
| 2026-04-09 12:00 |
14:27:57.51 |
-16:36:56.0 |
HIP 70795 |
23.44 |
| 2026-04-10 00:00 |
14:27:43.90 |
-16:36:26.6 |
HIP 70795 |
25.48 |
| 2026-04-10 12:00 |
14:27:30.22 |
-16:35:56.7 |
HIP 70795 |
27.79 |
| 2026-04-11 00:00 |
14:27:16.46 |
-16:35:26.3 |
HIP 70554 |
25.83 |
| 2026-04-11 12:00 |
14:27:02.65 |
-16:34:55.4 |
HIP 70554 |
23.11 |
| 2026-04-12 00:00 |
14:26:48.76 |
-16:34:24.0 |
HIP 70554 |
20.58 |
| 2026-04-12 12:00 |
14:26:34.81 |
-16:33:52.1 |
HIP 70554 |
18.29 |
| 2026-04-13 00:00 |
14:26:20.80 |
-16:33:19.8 |
HIP 70554 |
16.39 |
| 2026-04-13 12:00 |
14:26:06.73 |
-16:32:47.1 |
HIP 70554 |
15.01 |
| 2026-04-14 00:00 |
14:25:52.61 |
-16:32:13.8 |
HIP 70554 |
14.32 |
| 2026-04-14 12:00 |
14:25:38.43 |
-16:31:40.2 |
HIP 70554 |
14.43 |
| 2026-04-15 00:00 |
14:25:24.20 |
-16:31:06.1 |
HIP 70554 |
15.34 |
| 2026-04-15 12:00 |
14:25:09.92 |
-16:30:31.6 |
HIP 70554 |
16.93 |
| 2026-04-16 00:00 |
14:24:55.60 |
-16:29:56.7 |
HIP 70554 |
19.03 |