メタデータ
| 項目 |
値 |
| Designation |
C/1983 O2 (IRAS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1983-11-28T00:05:51.535680Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:31Z |
| Obs used |
35 |
| NEO |
- |
| M1 |
9.400 |
| K1 |
10.750 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1984-02-25.0000000 |
| e |
1.00012977 |
| q (au) |
2.254797 |
| a (au) |
-17374.673642 |
| i (deg) |
120.736009 |
| Ω (om, deg) |
201.257657 |
| ω (w, deg) |
333.980548 |
| M (ma, deg) |
0.000038 |
等級
散乱 + 全体線形
$$
M_a = (6.786 + 5.716\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
6.786 |
| n |
5.716 |
| 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 |
02:06:35.33 |
+54:24:24.9 |
HIP 9852 |
6.17 |
| 2026-06-01 12:00 |
02:06:37.58 |
+54:24:39.7 |
HIP 9852 |
6.35 |
| 2026-06-02 00:00 |
02:06:39.81 |
+54:24:54.6 |
HIP 9852 |
6.55 |
| 2026-06-02 12:00 |
02:06:42.04 |
+54:25:09.5 |
HIP 9852 |
6.77 |
| 2026-06-03 00:00 |
02:06:44.24 |
+54:25:24.5 |
HIP 9852 |
7.00 |
| 2026-06-03 12:00 |
02:06:46.44 |
+54:25:39.6 |
HIP 9852 |
7.26 |
| 2026-06-04 00:00 |
02:06:48.62 |
+54:25:54.8 |
HIP 9852 |
7.52 |
| 2026-06-04 12:00 |
02:06:50.78 |
+54:26:10.0 |
HIP 9852 |
7.80 |
| 2026-06-05 00:00 |
02:06:52.93 |
+54:26:25.4 |
HIP 9852 |
8.10 |
| 2026-06-05 12:00 |
02:06:55.07 |
+54:26:40.8 |
HIP 9852 |
8.40 |
| 2026-06-06 00:00 |
02:06:57.19 |
+54:26:56.2 |
HIP 9852 |
8.71 |
| 2026-06-06 12:00 |
02:06:59.30 |
+54:27:11.8 |
HIP 9852 |
9.03 |
| 2026-06-07 00:00 |
02:07:01.39 |
+54:27:27.4 |
HIP 9852 |
9.36 |
| 2026-06-07 12:00 |
02:07:03.46 |
+54:27:43.1 |
HIP 9852 |
9.69 |
| 2026-06-08 00:00 |
02:07:05.52 |
+54:27:58.9 |
HIP 9852 |
10.02 |
| 2026-06-08 12:00 |
02:07:07.56 |
+54:28:14.7 |
HIP 9852 |
10.37 |
| 2026-06-09 00:00 |
02:07:09.59 |
+54:28:30.6 |
HIP 9852 |
10.71 |
| 2026-06-09 12:00 |
02:07:11.61 |
+54:28:46.6 |
HIP 9852 |
11.06 |
| 2026-06-10 00:00 |
02:07:13.60 |
+54:29:02.6 |
HIP 9852 |
11.42 |
| 2026-06-10 12:00 |
02:07:15.58 |
+54:29:18.7 |
HIP 9852 |
11.77 |
| 2026-06-11 00:00 |
02:07:17.55 |
+54:29:34.9 |
HIP 9852 |
12.13 |
| 2026-06-11 12:00 |
02:07:19.49 |
+54:29:51.1 |
HIP 9852 |
12.49 |
| 2026-06-12 00:00 |
02:07:21.42 |
+54:30:07.4 |
HIP 9852 |
12.85 |
| 2026-06-12 12:00 |
02:07:23.34 |
+54:30:23.7 |
HIP 9852 |
13.22 |
| 2026-06-13 00:00 |
02:07:25.23 |
+54:30:40.1 |
HIP 9852 |
13.58 |
| 2026-06-13 12:00 |
02:07:27.11 |
+54:30:56.6 |
HIP 9852 |
13.95 |
| 2026-06-14 00:00 |
02:07:28.97 |
+54:31:13.1 |
HIP 9852 |
14.31 |
| 2026-06-14 12:00 |
02:07:30.82 |
+54:31:29.7 |
HIP 9852 |
14.68 |
| 2026-06-15 00:00 |
02:07:32.65 |
+54:31:46.3 |
HIP 9852 |
15.05 |
| 2026-06-15 12:00 |
02:07:34.46 |
+54:32:03.0 |
HIP 9852 |
15.42 |
| 2026-06-16 00:00 |
02:07:36.25 |
+54:32:19.7 |
HIP 9852 |
15.78 |
| 2026-06-16 12:00 |
02:07:38.02 |
+54:32:36.5 |
HIP 9852 |
16.15 |
| 2026-06-17 00:00 |
02:07:39.78 |
+54:32:53.3 |
HIP 9852 |
16.52 |
| 2026-06-17 12:00 |
02:07:41.51 |
+54:33:10.2 |
HIP 9852 |
16.89 |
| 2026-06-18 00:00 |
02:07:43.23 |
+54:33:27.1 |
HIP 9852 |
17.26 |
| 2026-06-18 12:00 |
02:07:44.93 |
+54:33:44.1 |
HIP 9852 |
17.63 |
| 2026-06-19 00:00 |
02:07:46.61 |
+54:34:01.1 |
HIP 9852 |
17.99 |
| 2026-06-19 12:00 |
02:07:48.27 |
+54:34:18.2 |
HIP 9852 |
18.36 |
| 2026-06-20 00:00 |
02:07:49.92 |
+54:34:35.3 |
HIP 9852 |
18.73 |
| 2026-06-20 12:00 |
02:07:51.54 |
+54:34:52.4 |
HIP 9852 |
19.09 |
| 2026-06-21 00:00 |
02:07:53.15 |
+54:35:09.6 |
HIP 9852 |
19.46 |
| 2026-06-21 12:00 |
02:07:54.73 |
+54:35:26.8 |
HIP 9852 |
19.82 |
| 2026-06-22 00:00 |
02:07:56.30 |
+54:35:44.0 |
HIP 9852 |
20.18 |