C/1972 X1 (Araya)
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 |
-0.502 |
| 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) |
| 2026-02-03 00:00 |
18:38:27.31 |
+27:41:50.9 |
HIP 91435 |
10.86 |
| 2026-02-03 12:00 |
18:38:28.74 |
+27:42:03.0 |
HIP 91435 |
10.53 |
| 2026-02-04 00:00 |
18:38:30.15 |
+27:42:15.3 |
HIP 91435 |
10.21 |
| 2026-02-04 12:00 |
18:38:31.55 |
+27:42:27.7 |
HIP 91435 |
9.90 |
| 2026-02-05 00:00 |
18:38:32.95 |
+27:42:40.2 |
HIP 91435 |
9.58 |
| 2026-02-05 12:00 |
18:38:34.34 |
+27:42:52.8 |
HIP 91435 |
9.27 |
| 2026-02-06 00:00 |
18:38:35.71 |
+27:43:05.5 |
HIP 91435 |
8.96 |
| 2026-02-06 12:00 |
18:38:37.08 |
+27:43:18.4 |
HIP 91435 |
8.66 |
| 2026-02-07 00:00 |
18:38:38.44 |
+27:43:31.4 |
HIP 91435 |
8.36 |
| 2026-02-07 12:00 |
18:38:39.79 |
+27:43:44.5 |
HIP 91435 |
8.06 |
| 2026-02-08 00:00 |
18:38:41.12 |
+27:43:57.7 |
HIP 91435 |
7.77 |
| 2026-02-08 12:00 |
18:38:42.45 |
+27:44:11.0 |
HIP 91435 |
7.48 |
| 2026-02-09 00:00 |
18:38:43.77 |
+27:44:24.5 |
HIP 91435 |
7.20 |
| 2026-02-09 12:00 |
18:38:45.08 |
+27:44:38.1 |
HIP 91435 |
6.93 |
| 2026-02-10 00:00 |
18:38:46.38 |
+27:44:51.8 |
HIP 91435 |
6.66 |
| 2026-02-10 12:00 |
18:38:47.67 |
+27:45:05.6 |
HIP 91435 |
6.41 |
| 2026-02-11 00:00 |
18:38:48.94 |
+27:45:19.5 |
HIP 91435 |
6.16 |
| 2026-02-11 12:00 |
18:38:50.21 |
+27:45:33.5 |
HIP 91435 |
5.92 |
| 2026-02-12 00:00 |
18:38:51.47 |
+27:45:47.7 |
HIP 91435 |
5.69 |
| 2026-02-12 12:00 |
18:38:52.72 |
+27:46:02.0 |
HIP 91435 |
5.48 |
| 2026-02-13 00:00 |
18:38:53.95 |
+27:46:16.3 |
HIP 91435 |
5.28 |
| 2026-02-13 12:00 |
18:38:55.17 |
+27:46:30.8 |
HIP 91435 |
5.10 |
| 2026-02-14 00:00 |
18:38:56.39 |
+27:46:45.4 |
HIP 91435 |
4.93 |
| 2026-02-14 12:00 |
18:38:57.59 |
+27:47:00.1 |
HIP 91435 |
4.78 |
| 2026-02-15 00:00 |
18:38:58.78 |
+27:47:14.9 |
HIP 91435 |
4.66 |
| 2026-02-15 12:00 |
18:38:59.96 |
+27:47:29.8 |
HIP 91435 |
4.55 |
| 2026-02-16 00:00 |
18:39:01.13 |
+27:47:44.8 |
HIP 91435 |
4.47 |
| 2026-02-16 12:00 |
18:39:02.29 |
+27:47:59.9 |
HIP 91435 |
4.42 |
| 2026-02-17 00:00 |
18:39:03.43 |
+27:48:15.1 |
HIP 91435 |
4.39 |
| 2026-02-17 12:00 |
18:39:04.57 |
+27:48:30.4 |
HIP 91435 |
4.39 |
| 2026-02-18 00:00 |
18:39:05.69 |
+27:48:45.8 |
HIP 91435 |
4.41 |
| 2026-02-18 12:00 |
18:39:06.80 |
+27:49:01.3 |
HIP 91435 |
4.46 |
| 2026-02-19 00:00 |
18:39:07.90 |
+27:49:16.9 |
HIP 91435 |
4.53 |
| 2026-02-19 12:00 |
18:39:08.98 |
+27:49:32.6 |
HIP 91435 |
4.63 |
| 2026-02-20 00:00 |
18:39:10.06 |
+27:49:48.4 |
HIP 91435 |
4.74 |
| 2026-02-20 12:00 |
18:39:11.12 |
+27:50:04.3 |
HIP 91435 |
4.88 |
| 2026-02-21 00:00 |
18:39:12.17 |
+27:50:20.3 |
HIP 91435 |
5.04 |
| 2026-02-21 12:00 |
18:39:13.20 |
+27:50:36.4 |
HIP 91435 |
5.21 |
| 2026-02-22 00:00 |
18:39:14.23 |
+27:50:52.5 |
HIP 91435 |
5.40 |
| 2026-02-22 12:00 |
18:39:15.24 |
+27:51:08.8 |
HIP 91435 |
5.60 |
| 2026-02-23 00:00 |
18:39:16.24 |
+27:51:25.1 |
HIP 91435 |
5.81 |
| 2026-02-23 12:00 |
18:39:17.22 |
+27:51:41.5 |
HIP 91435 |
6.03 |
| 2026-02-24 00:00 |
18:39:18.20 |
+27:51:58.0 |
HIP 91435 |
6.26 |