メタデータ
| 項目 |
値 |
| Designation |
C/1972 X1 (Araya) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1972-12-18T23:37:01.591680Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:22Z |
| Obs used |
71 |
| 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) |
1973-06-27.0000000 |
| e |
0.99949725 |
| q (au) |
4.860840 |
| a (au) |
9668.528147 |
| i (deg) |
113.089959 |
| Ω (om, deg) |
314.886101 |
| ω (w, deg) |
267.211628 |
| M (ma, deg) |
0.000197 |
等級
散乱 + 全体線形
$$
M_a = (-0.509 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
-0.509 |
| n |
6.000 |
| gf |
1.000 |
| gb |
-0.500 |
| k |
1.000 |
| 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 |
18:37:57.69 |
+28:45:21.8 |
HIP 91392 |
6.48 |
| 2026-06-01 12:00 |
18:37:56.07 |
+28:45:30.5 |
HIP 91392 |
6.86 |
| 2026-06-02 00:00 |
18:37:54.45 |
+28:45:39.2 |
HIP 91392 |
7.24 |
| 2026-06-02 12:00 |
18:37:52.82 |
+28:45:47.6 |
HIP 91392 |
7.61 |
| 2026-06-03 00:00 |
18:37:51.18 |
+28:45:55.9 |
HIP 91392 |
7.99 |
| 2026-06-03 12:00 |
18:37:49.54 |
+28:46:04.1 |
HIP 91392 |
8.37 |
| 2026-06-04 00:00 |
18:37:47.89 |
+28:46:12.2 |
HIP 91392 |
8.75 |
| 2026-06-04 12:00 |
18:37:46.23 |
+28:46:20.0 |
HIP 91361 |
9.05 |
| 2026-06-05 00:00 |
18:37:44.56 |
+28:46:27.8 |
HIP 91361 |
9.30 |
| 2026-06-05 12:00 |
18:37:42.89 |
+28:46:35.4 |
HIP 91361 |
9.55 |
| 2026-06-06 00:00 |
18:37:41.22 |
+28:46:42.8 |
HIP 91361 |
9.82 |
| 2026-06-06 12:00 |
18:37:39.53 |
+28:46:50.1 |
HIP 91361 |
10.09 |
| 2026-06-07 00:00 |
18:37:37.84 |
+28:46:57.3 |
HIP 91361 |
10.36 |
| 2026-06-07 12:00 |
18:37:36.15 |
+28:47:04.3 |
HIP 91361 |
10.64 |
| 2026-06-08 00:00 |
18:37:34.45 |
+28:47:11.2 |
HIP 91361 |
10.93 |
| 2026-06-08 12:00 |
18:37:32.74 |
+28:47:17.9 |
HIP 91361 |
11.22 |
| 2026-06-09 00:00 |
18:37:31.03 |
+28:47:24.4 |
HIP 91361 |
11.51 |
| 2026-06-09 12:00 |
18:37:29.31 |
+28:47:30.8 |
HIP 91361 |
11.81 |
| 2026-06-10 00:00 |
18:37:27.58 |
+28:47:37.1 |
HIP 91361 |
12.12 |
| 2026-06-10 12:00 |
18:37:25.85 |
+28:47:43.2 |
HIP 91361 |
12.42 |
| 2026-06-11 00:00 |
18:37:24.12 |
+28:47:49.2 |
HIP 91361 |
12.73 |
| 2026-06-11 12:00 |
18:37:22.38 |
+28:47:55.0 |
HIP 91361 |
13.05 |
| 2026-06-12 00:00 |
18:37:20.64 |
+28:48:00.6 |
HIP 91361 |
13.36 |
| 2026-06-12 12:00 |
18:37:18.89 |
+28:48:06.1 |
HIP 91361 |
13.68 |
| 2026-06-13 00:00 |
18:37:17.13 |
+28:48:11.5 |
HIP 91361 |
14.00 |
| 2026-06-13 12:00 |
18:37:15.37 |
+28:48:16.6 |
HIP 91361 |
14.33 |
| 2026-06-14 00:00 |
18:37:13.61 |
+28:48:21.7 |
HIP 91361 |
14.66 |
| 2026-06-14 12:00 |
18:37:11.84 |
+28:48:26.6 |
HIP 91361 |
14.98 |
| 2026-06-15 00:00 |
18:37:10.07 |
+28:48:31.3 |
HIP 91290 |
14.93 |
| 2026-06-15 12:00 |
18:37:08.30 |
+28:48:35.9 |
HIP 91290 |
14.89 |
| 2026-06-16 00:00 |
18:37:06.52 |
+28:48:40.3 |
HIP 91290 |
14.85 |
| 2026-06-16 12:00 |
18:37:04.74 |
+28:48:44.5 |
HIP 91290 |
14.84 |
| 2026-06-17 00:00 |
18:37:02.95 |
+28:48:48.6 |
HIP 91290 |
14.83 |
| 2026-06-17 12:00 |
18:37:01.16 |
+28:48:52.6 |
HIP 91290 |
14.84 |
| 2026-06-18 00:00 |
18:36:59.37 |
+28:48:56.4 |
HIP 91290 |
14.86 |
| 2026-06-18 12:00 |
18:36:57.57 |
+28:49:00.0 |
HIP 91290 |
14.89 |
| 2026-06-19 00:00 |
18:36:55.77 |
+28:49:03.5 |
HIP 91290 |
14.94 |
| 2026-06-19 12:00 |
18:36:53.97 |
+28:49:06.8 |
HIP 91290 |
15.00 |
| 2026-06-20 00:00 |
18:36:52.16 |
+28:49:09.9 |
HIP 91290 |
15.07 |
| 2026-06-20 12:00 |
18:36:50.36 |
+28:49:12.9 |
HIP 91290 |
15.16 |
| 2026-06-21 00:00 |
18:36:48.55 |
+28:49:15.8 |
HIP 91290 |
15.26 |
| 2026-06-21 12:00 |
18:36:46.73 |
+28:49:18.5 |
HIP 91290 |
15.37 |
| 2026-06-22 00:00 |
18:36:44.92 |
+28:49:21.0 |
HIP 91290 |
15.49 |