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 · University of Arizona 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 |
0.999 |
| 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) |
| 2026-06-01 00:00 |
14:04:52.19 |
-15:30:44.8 |
HIP 68729 |
10.86 |
| 2026-06-01 12:00 |
14:04:43.25 |
-15:30:17.4 |
HIP 68729 |
8.66 |
| 2026-06-02 00:00 |
14:04:34.44 |
-15:29:50.5 |
HIP 68729 |
6.51 |
| 2026-06-02 12:00 |
14:04:25.78 |
-15:29:24.1 |
HIP 68729 |
4.39 |
| 2026-06-03 00:00 |
14:04:17.25 |
-15:28:58.3 |
HIP 68729 |
2.34 |
| 2026-06-03 12:00 |
14:04:08.85 |
-15:28:33.0 |
HIP 68729 |
0.69 |
| 2026-06-04 00:00 |
14:04:00.60 |
-15:28:08.2 |
HIP 68729 |
1.97 |
| 2026-06-04 12:00 |
14:03:52.49 |
-15:27:44.0 |
HIP 68729 |
3.91 |
| 2026-06-05 00:00 |
14:03:44.51 |
-15:27:20.3 |
HIP 68729 |
5.85 |
| 2026-06-05 12:00 |
14:03:36.68 |
-15:26:57.2 |
HIP 68729 |
7.77 |
| 2026-06-06 00:00 |
14:03:28.99 |
-15:26:34.7 |
HIP 68729 |
9.65 |
| 2026-06-06 12:00 |
14:03:21.45 |
-15:26:12.7 |
HIP 68729 |
11.50 |
| 2026-06-07 00:00 |
14:03:14.04 |
-15:25:51.4 |
HIP 68729 |
13.32 |
| 2026-06-07 12:00 |
14:03:06.78 |
-15:25:30.6 |
HIP 68729 |
15.10 |
| 2026-06-08 00:00 |
14:02:59.67 |
-15:25:10.4 |
HIP 68729 |
16.85 |
| 2026-06-08 12:00 |
14:02:52.70 |
-15:24:50.8 |
HIP 68729 |
18.56 |
| 2026-06-09 00:00 |
14:02:45.88 |
-15:24:31.8 |
HIP 68729 |
20.23 |
| 2026-06-09 12:00 |
14:02:39.20 |
-15:24:13.4 |
HIP 68729 |
21.87 |
| 2026-06-10 00:00 |
14:02:32.67 |
-15:23:55.6 |
HIP 68729 |
23.46 |
| 2026-06-10 12:00 |
14:02:26.29 |
-15:23:38.5 |
HIP 68729 |
25.03 |
| 2026-06-11 00:00 |
14:02:20.06 |
-15:23:21.9 |
HIP 68729 |
26.55 |
| 2026-06-11 12:00 |
14:02:13.98 |
-15:23:06.0 |
HIP 68729 |
28.04 |
| 2026-06-12 00:00 |
14:02:08.05 |
-15:22:50.8 |
HIP 68729 |
29.49 |
| 2026-06-12 12:00 |
14:02:02.27 |
-15:22:36.2 |
HIP 68729 |
30.91 |
| 2026-06-13 00:00 |
14:01:56.64 |
-15:22:22.2 |
HIP 68729 |
32.28 |
| 2026-06-13 12:00 |
14:01:51.16 |
-15:22:08.9 |
HIP 68425 |
32.04 |
| 2026-06-14 00:00 |
14:01:45.84 |
-15:21:56.2 |
HIP 68425 |
31.08 |
| 2026-06-14 12:00 |
14:01:40.66 |
-15:21:44.2 |
HIP 68425 |
30.19 |
| 2026-06-15 00:00 |
14:01:35.65 |
-15:21:32.8 |
HIP 68425 |
29.34 |
| 2026-06-15 12:00 |
14:01:30.78 |
-15:21:22.2 |
HIP 68425 |
28.56 |
| 2026-06-16 00:00 |
14:01:26.07 |
-15:21:12.2 |
HIP 68425 |
27.83 |
| 2026-06-16 12:00 |
14:01:21.52 |
-15:21:02.8 |
HIP 68425 |
27.16 |
| 2026-06-17 00:00 |
14:01:17.11 |
-15:20:54.2 |
HIP 68425 |
26.54 |
| 2026-06-17 12:00 |
14:01:12.87 |
-15:20:46.3 |
HIP 68425 |
25.98 |
| 2026-06-18 00:00 |
14:01:08.78 |
-15:20:39.0 |
HIP 68425 |
25.48 |
| 2026-06-18 12:00 |
14:01:04.85 |
-15:20:32.4 |
HIP 68425 |
25.03 |
| 2026-06-19 00:00 |
14:01:01.07 |
-15:20:26.5 |
HIP 68425 |
24.63 |
| 2026-06-19 12:00 |
14:00:57.45 |
-15:20:21.3 |
HIP 68425 |
24.28 |
| 2026-06-20 00:00 |
14:00:53.98 |
-15:20:16.8 |
HIP 68425 |
23.98 |
| 2026-06-20 12:00 |
14:00:50.67 |
-15:20:13.1 |
HIP 68425 |
23.72 |
| 2026-06-21 00:00 |
14:00:47.52 |
-15:20:10.0 |
HIP 68425 |
23.51 |
| 2026-06-21 12:00 |
14:00:44.52 |
-15:20:07.6 |
HIP 68425 |
23.34 |
| 2026-06-22 00:00 |
14:00:41.68 |
-15:20:05.9 |
HIP 68425 |
23.20 |