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) |
| 2026-03-26 00:00 |
18:39:51.12 |
+28:10:15.6 |
HIP 91479 |
13.42 |
| 2026-03-26 12:00 |
18:39:51.21 |
+28:10:34.8 |
HIP 91479 |
13.14 |
| 2026-03-27 00:00 |
18:39:51.29 |
+28:10:54.1 |
HIP 91479 |
12.86 |
| 2026-03-27 12:00 |
18:39:51.36 |
+28:11:13.3 |
HIP 91479 |
12.57 |
| 2026-03-28 00:00 |
18:39:51.41 |
+28:11:32.6 |
HIP 91479 |
12.29 |
| 2026-03-28 12:00 |
18:39:51.44 |
+28:11:51.9 |
HIP 91479 |
12.01 |
| 2026-03-29 00:00 |
18:39:51.46 |
+28:12:11.1 |
HIP 91479 |
11.73 |
| 2026-03-29 12:00 |
18:39:51.46 |
+28:12:30.4 |
HIP 91479 |
11.45 |
| 2026-03-30 00:00 |
18:39:51.45 |
+28:12:49.6 |
HIP 91479 |
11.16 |
| 2026-03-30 12:00 |
18:39:51.42 |
+28:13:08.8 |
HIP 91479 |
10.88 |
| 2026-03-31 00:00 |
18:39:51.38 |
+28:13:28.1 |
HIP 91479 |
10.60 |
| 2026-03-31 12:00 |
18:39:51.32 |
+28:13:47.3 |
HIP 91479 |
10.33 |
| 2026-04-01 00:00 |
18:39:51.24 |
+28:14:06.5 |
HIP 91479 |
10.05 |
| 2026-04-01 12:00 |
18:39:51.15 |
+28:14:25.7 |
HIP 91479 |
9.77 |
| 2026-04-02 00:00 |
18:39:51.05 |
+28:14:44.9 |
HIP 91479 |
9.49 |
| 2026-04-02 12:00 |
18:39:50.93 |
+28:15:04.0 |
HIP 91479 |
9.22 |
| 2026-04-03 00:00 |
18:39:50.79 |
+28:15:23.2 |
HIP 91479 |
8.94 |
| 2026-04-03 12:00 |
18:39:50.64 |
+28:15:42.3 |
HIP 91479 |
8.67 |
| 2026-04-04 00:00 |
18:39:50.48 |
+28:16:01.5 |
HIP 91479 |
8.40 |
| 2026-04-04 12:00 |
18:39:50.30 |
+28:16:20.6 |
HIP 91479 |
8.13 |
| 2026-04-05 00:00 |
18:39:50.10 |
+28:16:39.6 |
HIP 91479 |
7.86 |
| 2026-04-05 12:00 |
18:39:49.89 |
+28:16:58.7 |
HIP 91479 |
7.60 |
| 2026-04-06 00:00 |
18:39:49.66 |
+28:17:17.7 |
HIP 91479 |
7.33 |
| 2026-04-06 12:00 |
18:39:49.42 |
+28:17:36.7 |
HIP 91479 |
7.07 |
| 2026-04-07 00:00 |
18:39:49.16 |
+28:17:55.7 |
HIP 91479 |
6.82 |
| 2026-04-07 12:00 |
18:39:48.89 |
+28:18:14.7 |
HIP 91479 |
6.56 |
| 2026-04-08 00:00 |
18:39:48.60 |
+28:18:33.6 |
HIP 91479 |
6.31 |
| 2026-04-08 12:00 |
18:39:48.29 |
+28:18:52.5 |
HIP 91479 |
6.07 |
| 2026-04-09 00:00 |
18:39:47.98 |
+28:19:11.4 |
HIP 91479 |
5.82 |
| 2026-04-09 12:00 |
18:39:47.64 |
+28:19:30.2 |
HIP 91479 |
5.59 |
| 2026-04-10 00:00 |
18:39:47.29 |
+28:19:49.0 |
HIP 91479 |
5.36 |
| 2026-04-10 12:00 |
18:39:46.93 |
+28:20:07.8 |
HIP 91479 |
5.14 |
| 2026-04-11 00:00 |
18:39:46.55 |
+28:20:26.5 |
HIP 91479 |
4.93 |
| 2026-04-11 12:00 |
18:39:46.15 |
+28:20:45.2 |
HIP 91479 |
4.72 |
| 2026-04-12 00:00 |
18:39:45.74 |
+28:21:03.9 |
HIP 91479 |
4.53 |
| 2026-04-12 12:00 |
18:39:45.32 |
+28:21:22.5 |
HIP 91479 |
4.35 |
| 2026-04-13 00:00 |
18:39:44.88 |
+28:21:41.1 |
HIP 91479 |
4.18 |
| 2026-04-13 12:00 |
18:39:44.42 |
+28:21:59.6 |
HIP 91479 |
4.03 |
| 2026-04-14 00:00 |
18:39:43.95 |
+28:22:18.1 |
HIP 91479 |
3.90 |
| 2026-04-14 12:00 |
18:39:43.47 |
+28:22:36.5 |
HIP 91479 |
3.79 |
| 2026-04-15 00:00 |
18:39:42.97 |
+28:22:54.9 |
HIP 91479 |
3.70 |
| 2026-04-15 12:00 |
18:39:42.45 |
+28:23:13.2 |
HIP 91479 |
3.64 |
| 2026-04-16 00:00 |
18:39:41.92 |
+28:23:31.5 |
HIP 91479 |
3.59 |