メタデータ
| 項目 |
値 |
| Designation |
C/1991 Y1 (Zanotta-Brewington) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1992-01-31T23:47:40.372800Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:41Z |
| Obs used |
266 |
| NEO |
- |
| M1 |
10.200 |
| K1 |
14.750 |
| PC |
0.030 |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1992-01-10.0000000 |
| e |
1.00005670 |
| q (au) |
0.643969 |
| a (au) |
-11357.972781 |
| i (deg) |
50.028225 |
| Ω (om, deg) |
254.908258 |
| ω (w, deg) |
197.872524 |
| M (ma, deg) |
-0.000018 |
等級
散乱 + 全体線形
$$
M_a = (9.204 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
9.204 |
| n |
2.000 |
| gf |
0.800 |
| gb |
-0.500 |
| k |
0.800 |
| δ90 |
1.000 |
| 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
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) |
終了日 (UTC) |
a |
b |
| 1991-12-23 |
1992-01-31 |
+0.0509 |
+0.039 |
| 1992-02-01 |
1992-05-02 |
+12.8239 |
+2.103 |
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) |
| 2026-06-01 00:00 |
17:12:54.05 |
-18:21:20.7 |
HIP 84270 |
14.91 |
| 2026-06-01 12:00 |
17:12:51.97 |
-18:21:17.4 |
HIP 84270 |
15.30 |
| 2026-06-02 00:00 |
17:12:49.89 |
-18:21:14.2 |
HIP 84270 |
15.68 |
| 2026-06-02 12:00 |
17:12:47.81 |
-18:21:10.9 |
HIP 84270 |
16.08 |
| 2026-06-03 00:00 |
17:12:45.72 |
-18:21:07.7 |
HIP 84270 |
16.48 |
| 2026-06-03 12:00 |
17:12:43.63 |
-18:21:04.5 |
HIP 84270 |
16.88 |
| 2026-06-04 00:00 |
17:12:41.54 |
-18:21:01.4 |
HIP 84270 |
17.29 |
| 2026-06-04 12:00 |
17:12:39.45 |
-18:20:58.2 |
HIP 84270 |
17.71 |
| 2026-06-05 00:00 |
17:12:37.36 |
-18:20:55.1 |
HIP 84270 |
18.13 |
| 2026-06-05 12:00 |
17:12:35.26 |
-18:20:52.0 |
HIP 84270 |
18.55 |
| 2026-06-06 00:00 |
17:12:33.17 |
-18:20:48.9 |
HIP 84270 |
18.98 |
| 2026-06-06 12:00 |
17:12:31.07 |
-18:20:45.8 |
HIP 84270 |
19.41 |
| 2026-06-07 00:00 |
17:12:28.97 |
-18:20:42.7 |
HIP 84270 |
19.85 |
| 2026-06-07 12:00 |
17:12:26.87 |
-18:20:39.7 |
HIP 84270 |
20.28 |
| 2026-06-08 00:00 |
17:12:24.77 |
-18:20:36.6 |
HIP 84270 |
20.72 |
| 2026-06-08 12:00 |
17:12:22.67 |
-18:20:33.6 |
HIP 84270 |
21.17 |
| 2026-06-09 00:00 |
17:12:20.56 |
-18:20:30.6 |
HIP 84270 |
21.61 |
| 2026-06-09 12:00 |
17:12:18.46 |
-18:20:27.7 |
HIP 84194 |
21.69 |
| 2026-06-10 00:00 |
17:12:16.36 |
-18:20:24.7 |
HIP 84194 |
21.75 |
| 2026-06-10 12:00 |
17:12:14.25 |
-18:20:21.8 |
HIP 84194 |
21.82 |
| 2026-06-11 00:00 |
17:12:12.15 |
-18:20:18.9 |
HIP 84194 |
21.90 |
| 2026-06-11 12:00 |
17:12:10.05 |
-18:20:16.0 |
HIP 84194 |
22.00 |
| 2026-06-12 00:00 |
17:12:07.95 |
-18:20:13.1 |
HIP 84194 |
22.10 |
| 2026-06-12 12:00 |
17:12:05.85 |
-18:20:10.2 |
HIP 84194 |
22.22 |
| 2026-06-13 00:00 |
17:12:03.75 |
-18:20:07.4 |
HIP 84194 |
22.35 |
| 2026-06-13 12:00 |
17:12:01.65 |
-18:20:04.6 |
HIP 84194 |
22.48 |
| 2026-06-14 00:00 |
17:11:59.55 |
-18:20:01.8 |
HIP 84194 |
22.63 |
| 2026-06-14 12:00 |
17:11:57.45 |
-18:19:59.0 |
HIP 84194 |
22.79 |
| 2026-06-15 00:00 |
17:11:55.35 |
-18:19:56.3 |
HIP 84194 |
22.96 |
| 2026-06-15 12:00 |
17:11:53.26 |
-18:19:53.5 |
HIP 84194 |
23.14 |
| 2026-06-16 00:00 |
17:11:51.17 |
-18:19:50.8 |
HIP 84194 |
23.33 |
| 2026-06-16 12:00 |
17:11:49.08 |
-18:19:48.2 |
HIP 84194 |
23.52 |
| 2026-06-17 00:00 |
17:11:46.99 |
-18:19:45.5 |
HIP 84194 |
23.73 |
| 2026-06-17 12:00 |
17:11:44.90 |
-18:19:42.8 |
HIP 84194 |
23.94 |
| 2026-06-18 00:00 |
17:11:42.82 |
-18:19:40.2 |
HIP 84194 |
24.17 |
| 2026-06-18 12:00 |
17:11:40.74 |
-18:19:37.6 |
HIP 84194 |
24.40 |
| 2026-06-19 00:00 |
17:11:38.66 |
-18:19:35.1 |
HIP 84194 |
24.64 |
| 2026-06-19 12:00 |
17:11:36.59 |
-18:19:32.5 |
HIP 84194 |
24.88 |
| 2026-06-20 00:00 |
17:11:34.51 |
-18:19:30.0 |
HIP 84194 |
25.13 |
| 2026-06-20 12:00 |
17:11:32.45 |
-18:19:27.5 |
HIP 84194 |
25.39 |
| 2026-06-21 00:00 |
17:11:30.38 |
-18:19:25.0 |
HIP 84194 |
25.66 |
| 2026-06-21 12:00 |
17:11:28.32 |
-18:19:22.5 |
HIP 84194 |
25.93 |
| 2026-06-22 00:00 |
17:11:26.26 |
-18:19:20.1 |
HIP 84194 |
26.21 |