メタデータ
| 項目 |
値 |
| Designation |
C/1990 N1 (Tsuchiya-Kiuchi) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1990-09-28T17:50:51.195840Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:38Z |
| Obs used |
103 |
| NEO |
- |
| M1 |
5.700 |
| K1 |
10.250 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1990-09-26.0000000 |
| e |
0.99539790 |
| q (au) |
1.092441 |
| a (au) |
237.378969 |
| i (deg) |
143.783475 |
| Ω (om, deg) |
330.737409 |
| ω (w, deg) |
180.920585 |
| M (ma, deg) |
359.999261 |
等級
散乱 + 全体線形
$$
M_a = (5.880 + 4.904\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
5.880 |
| n |
4.904 |
| gf |
0.997 |
| gb |
-0.500 |
| k |
0.800 |
| δ90 |
2.918 |
| 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
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) |
終了日 (UTC) |
a |
b |
| 1990-07-13 |
1990-08-19 |
-3.4293 |
+0.264 |
| 1990-10-02 |
1991-01-10 |
+3.4774 |
-0.245 |
| 1991-01-10 |
1991-02-10 |
-5.5277 |
+2.934 |
log10 r = log10(太陽距離/AU)、Δ = 地球距離(AU)
天体暦
| Date/Time (UTC) |
RA (J2000) |
Dec (J2000) |
Nearest HIP |
Dist from HIP (arcmin) |
| 2026-05-12 00:00 |
23:09:44.54 |
-14:07:35.9 |
HIP 114371 |
23.07 |
| 2026-05-12 12:00 |
23:09:45.31 |
-14:07:34.9 |
HIP 114371 |
23.07 |
| 2026-05-13 00:00 |
23:09:46.07 |
-14:07:33.9 |
HIP 114371 |
23.08 |
| 2026-05-13 12:00 |
23:09:46.82 |
-14:07:33.1 |
HIP 114371 |
23.09 |
| 2026-05-14 00:00 |
23:09:47.55 |
-14:07:32.3 |
HIP 114371 |
23.10 |
| 2026-05-14 12:00 |
23:09:48.26 |
-14:07:31.7 |
HIP 114371 |
23.11 |
| 2026-05-15 00:00 |
23:09:48.97 |
-14:07:31.1 |
HIP 114371 |
23.11 |
| 2026-05-15 12:00 |
23:09:49.65 |
-14:07:30.7 |
HIP 114371 |
23.12 |
| 2026-05-16 00:00 |
23:09:50.33 |
-14:07:30.4 |
HIP 114371 |
23.13 |
| 2026-05-16 12:00 |
23:09:50.98 |
-14:07:30.2 |
HIP 114371 |
23.13 |
| 2026-05-17 00:00 |
23:09:51.62 |
-14:07:30.1 |
HIP 114371 |
23.14 |
| 2026-05-17 12:00 |
23:09:52.25 |
-14:07:30.0 |
HIP 114371 |
23.14 |
| 2026-05-18 00:00 |
23:09:52.86 |
-14:07:30.1 |
HIP 114371 |
23.14 |
| 2026-05-18 12:00 |
23:09:53.46 |
-14:07:30.4 |
HIP 114371 |
23.15 |
| 2026-05-19 00:00 |
23:09:54.04 |
-14:07:30.7 |
HIP 114371 |
23.15 |
| 2026-05-19 12:00 |
23:09:54.61 |
-14:07:31.1 |
HIP 114371 |
23.15 |
| 2026-05-20 00:00 |
23:09:55.16 |
-14:07:31.6 |
HIP 114371 |
23.15 |
| 2026-05-20 12:00 |
23:09:55.69 |
-14:07:32.2 |
HIP 114371 |
23.14 |
| 2026-05-21 00:00 |
23:09:56.21 |
-14:07:33.0 |
HIP 114371 |
23.14 |
| 2026-05-21 12:00 |
23:09:56.72 |
-14:07:33.8 |
HIP 114371 |
23.13 |
| 2026-05-22 00:00 |
23:09:57.21 |
-14:07:34.8 |
HIP 114371 |
23.13 |
| 2026-05-22 12:00 |
23:09:57.68 |
-14:07:35.8 |
HIP 114371 |
23.12 |
| 2026-05-23 00:00 |
23:09:58.14 |
-14:07:37.0 |
HIP 114371 |
23.11 |
| 2026-05-23 12:00 |
23:09:58.58 |
-14:07:38.2 |
HIP 114371 |
23.10 |
| 2026-05-24 00:00 |
23:09:59.01 |
-14:07:39.6 |
HIP 114371 |
23.09 |
| 2026-05-24 12:00 |
23:09:59.42 |
-14:07:41.1 |
HIP 114371 |
23.07 |
| 2026-05-25 00:00 |
23:09:59.81 |
-14:07:42.7 |
HIP 114371 |
23.06 |
| 2026-05-25 12:00 |
23:10:00.19 |
-14:07:44.3 |
HIP 114371 |
23.04 |
| 2026-05-26 00:00 |
23:10:00.56 |
-14:07:46.1 |
HIP 114371 |
23.02 |
| 2026-05-26 12:00 |
23:10:00.91 |
-14:07:48.0 |
HIP 114371 |
23.00 |
| 2026-05-27 00:00 |
23:10:01.24 |
-14:07:50.0 |
HIP 114371 |
22.97 |
| 2026-05-27 12:00 |
23:10:01.56 |
-14:07:52.1 |
HIP 114371 |
22.95 |
| 2026-05-28 00:00 |
23:10:01.86 |
-14:07:54.3 |
HIP 114371 |
22.92 |
| 2026-05-28 12:00 |
23:10:02.14 |
-14:07:56.6 |
HIP 114371 |
22.89 |
| 2026-05-29 00:00 |
23:10:02.41 |
-14:07:59.0 |
HIP 114371 |
22.86 |
| 2026-05-29 12:00 |
23:10:02.67 |
-14:08:01.5 |
HIP 114371 |
22.83 |
| 2026-05-30 00:00 |
23:10:02.91 |
-14:08:04.1 |
HIP 114371 |
22.80 |
| 2026-05-30 12:00 |
23:10:03.13 |
-14:08:06.8 |
HIP 114371 |
22.76 |
| 2026-05-31 00:00 |
23:10:03.33 |
-14:08:09.6 |
HIP 114371 |
22.72 |
| 2026-05-31 12:00 |
23:10:03.52 |
-14:08:12.5 |
HIP 114371 |
22.68 |
| 2026-06-01 00:00 |
23:10:03.70 |
-14:08:15.6 |
HIP 114371 |
22.63 |
| 2026-06-01 12:00 |
23:10:03.86 |
-14:08:18.7 |
HIP 114371 |
22.59 |
| 2026-06-02 00:00 |
23:10:04.00 |
-14:08:21.9 |
HIP 114371 |
22.54 |