メタデータ
| 項目 |
値 |
| Designation |
C/1983 J2 (IRAS) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1983-01-18T15:30:12.680640Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:31Z |
| Obs used |
7 |
| 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) |
1983-05-30.0000000 |
| e |
0.99471612 |
| q (au) |
1.416663 |
| a (au) |
268.110599 |
| i (deg) |
152.173465 |
| Ω (om, deg) |
119.690042 |
| ω (w, deg) |
227.019078 |
| M (ma, deg) |
0.029490 |
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) |
| 2026-03-26 00:00 |
06:03:17.38 |
+37:25:36.5 |
HIP 28727 |
16.89 |
| 2026-03-26 12:00 |
06:03:17.47 |
+37:25:30.3 |
HIP 28727 |
16.79 |
| 2026-03-27 00:00 |
06:03:17.59 |
+37:25:24.1 |
HIP 28727 |
16.69 |
| 2026-03-27 12:00 |
06:03:17.72 |
+37:25:17.9 |
HIP 28727 |
16.59 |
| 2026-03-28 00:00 |
06:03:17.87 |
+37:25:11.7 |
HIP 28727 |
16.49 |
| 2026-03-28 12:00 |
06:03:18.04 |
+37:25:05.5 |
HIP 28727 |
16.38 |
| 2026-03-29 00:00 |
06:03:18.23 |
+37:24:59.3 |
HIP 28727 |
16.28 |
| 2026-03-29 12:00 |
06:03:18.44 |
+37:24:53.1 |
HIP 28727 |
16.17 |
| 2026-03-30 00:00 |
06:03:18.67 |
+37:24:46.9 |
HIP 28727 |
16.06 |
| 2026-03-30 12:00 |
06:03:18.92 |
+37:24:40.8 |
HIP 28727 |
15.94 |
| 2026-03-31 00:00 |
06:03:19.19 |
+37:24:34.6 |
HIP 28727 |
15.83 |
| 2026-03-31 12:00 |
06:03:19.47 |
+37:24:28.5 |
HIP 28727 |
15.71 |
| 2026-04-01 00:00 |
06:03:19.78 |
+37:24:22.3 |
HIP 28727 |
15.59 |
| 2026-04-01 12:00 |
06:03:20.10 |
+37:24:16.2 |
HIP 28727 |
15.47 |
| 2026-04-02 00:00 |
06:03:20.44 |
+37:24:10.1 |
HIP 28727 |
15.35 |
| 2026-04-02 12:00 |
06:03:20.80 |
+37:24:04.0 |
HIP 28727 |
15.23 |
| 2026-04-03 00:00 |
06:03:21.18 |
+37:23:57.9 |
HIP 28727 |
15.10 |
| 2026-04-03 12:00 |
06:03:21.58 |
+37:23:51.8 |
HIP 28727 |
14.97 |
| 2026-04-04 00:00 |
06:03:22.00 |
+37:23:45.8 |
HIP 28727 |
14.84 |
| 2026-04-04 12:00 |
06:03:22.43 |
+37:23:39.7 |
HIP 28727 |
14.71 |
| 2026-04-05 00:00 |
06:03:22.89 |
+37:23:33.7 |
HIP 28727 |
14.58 |
| 2026-04-05 12:00 |
06:03:23.36 |
+37:23:27.7 |
HIP 28727 |
14.44 |
| 2026-04-06 00:00 |
06:03:23.85 |
+37:23:21.6 |
HIP 28727 |
14.30 |
| 2026-04-06 12:00 |
06:03:24.36 |
+37:23:15.6 |
HIP 28727 |
14.16 |
| 2026-04-07 00:00 |
06:03:24.89 |
+37:23:09.7 |
HIP 28727 |
14.02 |
| 2026-04-07 12:00 |
06:03:25.44 |
+37:23:03.7 |
HIP 28727 |
13.88 |
| 2026-04-08 00:00 |
06:03:26.00 |
+37:22:57.7 |
HIP 28727 |
13.73 |
| 2026-04-08 12:00 |
06:03:26.58 |
+37:22:51.8 |
HIP 28727 |
13.59 |
| 2026-04-09 00:00 |
06:03:27.19 |
+37:22:45.9 |
HIP 28727 |
13.44 |
| 2026-04-09 12:00 |
06:03:27.80 |
+37:22:40.0 |
HIP 28727 |
13.29 |
| 2026-04-10 00:00 |
06:03:28.44 |
+37:22:34.1 |
HIP 28727 |
13.14 |
| 2026-04-10 12:00 |
06:03:29.10 |
+37:22:28.2 |
HIP 28727 |
12.99 |
| 2026-04-11 00:00 |
06:03:29.77 |
+37:22:22.4 |
HIP 28727 |
12.83 |
| 2026-04-11 12:00 |
06:03:30.46 |
+37:22:16.6 |
HIP 28727 |
12.68 |
| 2026-04-12 00:00 |
06:03:31.17 |
+37:22:10.8 |
HIP 28727 |
12.52 |
| 2026-04-12 12:00 |
06:03:31.90 |
+37:22:05.0 |
HIP 28727 |
12.37 |
| 2026-04-13 00:00 |
06:03:32.64 |
+37:21:59.2 |
HIP 28727 |
12.21 |
| 2026-04-13 12:00 |
06:03:33.40 |
+37:21:53.5 |
HIP 28727 |
12.05 |
| 2026-04-14 00:00 |
06:03:34.18 |
+37:21:47.7 |
HIP 28727 |
11.89 |
| 2026-04-14 12:00 |
06:03:34.98 |
+37:21:42.0 |
HIP 28727 |
11.73 |
| 2026-04-15 00:00 |
06:03:35.79 |
+37:21:36.3 |
HIP 28727 |
11.56 |
| 2026-04-15 12:00 |
06:03:36.62 |
+37:21:30.7 |
HIP 28727 |
11.40 |
| 2026-04-16 00:00 |
06:03:37.47 |
+37:21:25.0 |
HIP 28727 |
11.24 |