C/2023 X4 (Hogan)
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) |
| 2026-02-03 00:00 |
14:37:21.75 |
-16:00:19.3 |
HIP 71515 |
32.23 |
| 2026-02-03 12:00 |
14:37:28.76 |
-16:01:26.3 |
HIP 71515 |
31.02 |
| 2026-02-04 00:00 |
14:37:35.60 |
-16:02:32.6 |
HIP 71515 |
29.90 |
| 2026-02-04 12:00 |
14:37:42.26 |
-16:03:38.0 |
HIP 71515 |
28.89 |
| 2026-02-05 00:00 |
14:37:48.74 |
-16:04:42.8 |
HIP 71515 |
27.98 |
| 2026-02-05 12:00 |
14:37:55.05 |
-16:05:46.7 |
HIP 71515 |
27.17 |
| 2026-02-06 00:00 |
14:38:01.19 |
-16:06:49.9 |
HIP 71515 |
26.48 |
| 2026-02-06 12:00 |
14:38:07.15 |
-16:07:52.3 |
HIP 71515 |
25.89 |
| 2026-02-07 00:00 |
14:38:12.92 |
-16:08:54.0 |
HIP 71515 |
25.40 |
| 2026-02-07 12:00 |
14:38:18.53 |
-16:09:54.9 |
HIP 71515 |
25.02 |
| 2026-02-08 00:00 |
14:38:23.95 |
-16:10:55.0 |
HIP 71515 |
24.74 |
| 2026-02-08 12:00 |
14:38:29.19 |
-16:11:54.4 |
HIP 71713 |
23.83 |
| 2026-02-09 00:00 |
14:38:34.26 |
-16:12:52.9 |
HIP 71713 |
22.63 |
| 2026-02-09 12:00 |
14:38:39.14 |
-16:13:50.7 |
HIP 71713 |
21.51 |
| 2026-02-10 00:00 |
14:38:43.84 |
-16:14:47.7 |
HIP 71713 |
20.49 |
| 2026-02-10 12:00 |
14:38:48.36 |
-16:15:44.0 |
HIP 71713 |
19.57 |
| 2026-02-11 00:00 |
14:38:52.70 |
-16:16:39.4 |
HIP 71713 |
18.75 |
| 2026-02-11 12:00 |
14:38:56.86 |
-16:17:34.1 |
HIP 71713 |
18.04 |
| 2026-02-12 00:00 |
14:39:00.83 |
-16:18:28.0 |
HIP 71713 |
17.44 |
| 2026-02-12 12:00 |
14:39:04.62 |
-16:19:21.1 |
HIP 71713 |
16.95 |
| 2026-02-13 00:00 |
14:39:08.23 |
-16:20:13.4 |
HIP 71713 |
16.58 |
| 2026-02-13 12:00 |
14:39:11.65 |
-16:21:05.0 |
HIP 71680 |
15.80 |
| 2026-02-14 00:00 |
14:39:14.89 |
-16:21:55.7 |
HIP 71680 |
14.71 |
| 2026-02-14 12:00 |
14:39:17.95 |
-16:22:45.7 |
HIP 71680 |
13.66 |
| 2026-02-15 00:00 |
14:39:20.82 |
-16:23:34.8 |
HIP 71680 |
12.64 |
| 2026-02-15 12:00 |
14:39:23.50 |
-16:24:23.2 |
HIP 71680 |
11.66 |
| 2026-02-16 00:00 |
14:39:26.00 |
-16:25:10.8 |
HIP 71680 |
10.72 |
| 2026-02-16 12:00 |
14:39:28.32 |
-16:25:57.6 |
HIP 71680 |
9.81 |
| 2026-02-17 00:00 |
14:39:30.44 |
-16:26:43.6 |
HIP 71680 |
8.94 |
| 2026-02-17 12:00 |
14:39:32.39 |
-16:27:28.8 |
HIP 71680 |
8.10 |
| 2026-02-18 00:00 |
14:39:34.14 |
-16:28:13.2 |
HIP 71680 |
7.29 |
| 2026-02-18 12:00 |
14:39:35.71 |
-16:28:56.8 |
HIP 71680 |
6.51 |
| 2026-02-19 00:00 |
14:39:37.10 |
-16:29:39.6 |
HIP 71680 |
5.76 |
| 2026-02-19 12:00 |
14:39:38.29 |
-16:30:21.6 |
HIP 71680 |
5.03 |
| 2026-02-20 00:00 |
14:39:39.30 |
-16:31:02.8 |
HIP 71680 |
4.34 |
| 2026-02-20 12:00 |
14:39:40.13 |
-16:31:43.2 |
HIP 71680 |
3.66 |
| 2026-02-21 00:00 |
14:39:40.76 |
-16:32:22.8 |
HIP 71680 |
3.01 |
| 2026-02-21 12:00 |
14:39:41.22 |
-16:33:01.6 |
HIP 71680 |
2.38 |
| 2026-02-22 00:00 |
14:39:41.48 |
-16:33:39.6 |
HIP 71680 |
1.77 |
| 2026-02-22 12:00 |
14:39:41.56 |
-16:34:16.9 |
HIP 71680 |
1.19 |
| 2026-02-23 00:00 |
14:39:41.45 |
-16:34:53.3 |
HIP 71680 |
0.65 |
| 2026-02-23 12:00 |
14:39:41.16 |
-16:35:28.9 |
HIP 71680 |
0.36 |
| 2026-02-24 00:00 |
14:39:40.69 |
-16:36:03.8 |
HIP 71680 |
0.72 |