メタデータ
| 項目 |
値 |
| Designation |
C/1954 Y1 (Haro-Chavira) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1956-01-26T17:36:40.613760Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:12Z |
| Obs used |
57 |
| NEO |
- |
| M1 |
- |
| K1 |
- |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1956-08-14.0000000 |
| e |
1.00460292 |
| q (au) |
4.076984 |
| a (au) |
-885.738904 |
| i (deg) |
79.600837 |
| Ω (om, deg) |
72.875012 |
| ω (w, deg) |
57.309578 |
| M (ma, deg) |
0.007488 |
等級
散乱 + 全体線形
$$
M_a = (H_0 + n\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
- |
| n |
- |
| gf |
- |
| gb |
- |
| k |
- |
| δ90 |
- |
| 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) |
| 2026-09-20 00:00 |
16:52:58.92 |
-54:59:45.4 |
HIP 82663 |
9.32 |
| 2026-09-20 12:00 |
16:52:59.44 |
-54:59:36.4 |
HIP 82663 |
9.33 |
| 2026-09-21 00:00 |
16:52:59.97 |
-54:59:27.5 |
HIP 82663 |
9.34 |
| 2026-09-21 12:00 |
16:53:00.52 |
-54:59:18.6 |
HIP 82663 |
9.35 |
| 2026-09-22 00:00 |
16:53:01.09 |
-54:59:09.8 |
HIP 82663 |
9.36 |
| 2026-09-22 12:00 |
16:53:01.68 |
-54:59:01.0 |
HIP 82663 |
9.38 |
| 2026-09-23 00:00 |
16:53:02.28 |
-54:58:52.2 |
HIP 82663 |
9.39 |
| 2026-09-23 12:00 |
16:53:02.91 |
-54:58:43.5 |
HIP 82663 |
9.40 |
| 2026-09-24 00:00 |
16:53:03.55 |
-54:58:34.8 |
HIP 82663 |
9.42 |
| 2026-09-24 12:00 |
16:53:04.21 |
-54:58:26.2 |
HIP 82663 |
9.43 |
| 2026-09-25 00:00 |
16:53:04.89 |
-54:58:17.6 |
HIP 82663 |
9.45 |
| 2026-09-25 12:00 |
16:53:05.58 |
-54:58:09.0 |
HIP 82663 |
9.47 |
| 2026-09-26 00:00 |
16:53:06.29 |
-54:58:00.5 |
HIP 82663 |
9.48 |
| 2026-09-26 12:00 |
16:53:07.02 |
-54:57:52.1 |
HIP 82663 |
9.50 |
| 2026-09-27 00:00 |
16:53:07.77 |
-54:57:43.6 |
HIP 82663 |
9.52 |
| 2026-09-27 12:00 |
16:53:08.54 |
-54:57:35.3 |
HIP 82663 |
9.54 |
| 2026-09-28 00:00 |
16:53:09.32 |
-54:57:26.9 |
HIP 82663 |
9.56 |
| 2026-09-28 12:00 |
16:53:10.12 |
-54:57:18.6 |
HIP 82663 |
9.58 |
| 2026-09-29 00:00 |
16:53:10.94 |
-54:57:10.4 |
HIP 82663 |
9.61 |
| 2026-09-29 12:00 |
16:53:11.77 |
-54:57:02.2 |
HIP 82663 |
9.63 |
| 2026-09-30 00:00 |
16:53:12.63 |
-54:56:54.1 |
HIP 82663 |
9.66 |
| 2026-09-30 12:00 |
16:53:13.50 |
-54:56:46.0 |
HIP 82663 |
9.68 |
| 2026-10-01 00:00 |
16:53:14.38 |
-54:56:37.9 |
HIP 82663 |
9.71 |
| 2026-10-01 12:00 |
16:53:15.29 |
-54:56:29.9 |
HIP 82663 |
9.74 |
| 2026-10-02 00:00 |
16:53:16.21 |
-54:56:22.0 |
HIP 82663 |
9.77 |
| 2026-10-02 12:00 |
16:53:17.15 |
-54:56:14.0 |
HIP 82663 |
9.80 |
| 2026-10-03 00:00 |
16:53:18.10 |
-54:56:06.2 |
HIP 82663 |
9.84 |
| 2026-10-03 12:00 |
16:53:19.08 |
-54:55:58.4 |
HIP 82663 |
9.87 |
| 2026-10-04 00:00 |
16:53:20.07 |
-54:55:50.7 |
HIP 82663 |
9.91 |
| 2026-10-04 12:00 |
16:53:21.07 |
-54:55:43.0 |
HIP 82663 |
9.95 |
| 2026-10-05 00:00 |
16:53:22.09 |
-54:55:35.3 |
HIP 82663 |
9.99 |
| 2026-10-05 12:00 |
16:53:23.13 |
-54:55:27.7 |
HIP 82663 |
10.03 |
| 2026-10-06 00:00 |
16:53:24.19 |
-54:55:20.2 |
HIP 82663 |
10.07 |
| 2026-10-06 12:00 |
16:53:25.26 |
-54:55:12.7 |
HIP 82663 |
10.12 |
| 2026-10-07 00:00 |
16:53:26.35 |
-54:55:05.3 |
HIP 82663 |
10.16 |
| 2026-10-07 12:00 |
16:53:27.46 |
-54:54:57.9 |
HIP 82663 |
10.21 |
| 2026-10-08 00:00 |
16:53:28.58 |
-54:54:50.6 |
HIP 82663 |
10.26 |
| 2026-10-08 12:00 |
16:53:29.72 |
-54:54:43.4 |
HIP 82663 |
10.32 |
| 2026-10-09 00:00 |
16:53:30.87 |
-54:54:36.2 |
HIP 82663 |
10.37 |
| 2026-10-09 12:00 |
16:53:32.04 |
-54:54:29.1 |
HIP 82663 |
10.43 |
| 2026-10-10 00:00 |
16:53:33.23 |
-54:54:22.0 |
HIP 82663 |
10.49 |
| 2026-10-10 12:00 |
16:53:34.43 |
-54:54:15.0 |
HIP 82663 |
10.55 |
| 2026-10-11 00:00 |
16:53:35.65 |
-54:54:08.0 |
HIP 82663 |
10.61 |