メタデータ
| 項目 |
値 |
| Designation |
C/1989 Y2 (McKenzie-Russell) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
1989-11-07T16:28:56.971200Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:29:38Z |
| Obs used |
45 |
| NEO |
- |
| M1 |
10.000 |
| K1 |
10.000 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
1989-12-30.0000000 |
| e |
0.99999649 |
| q (au) |
1.975796 |
| a (au) |
562869.874478 |
| i (deg) |
160.336275 |
| Ω (om, deg) |
293.896265 |
| ω (w, deg) |
191.736136 |
| M (ma, deg) |
0.000000 |
等級
散乱 + 全体線形
$$
M_a = (10.266 + 2.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
10.266 |
| n |
2.000 |
| gf |
1.000 |
| gb |
-0.972 |
| 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) |
| 2026-05-12 00:00 |
20:26:06.12 |
-22:19:25.9 |
HIP 100769 |
16.43 |
| 2026-05-12 12:00 |
20:26:05.46 |
-22:19:29.3 |
HIP 100769 |
16.35 |
| 2026-05-13 00:00 |
20:26:04.79 |
-22:19:32.8 |
HIP 100769 |
16.26 |
| 2026-05-13 12:00 |
20:26:04.10 |
-22:19:36.3 |
HIP 100769 |
16.17 |
| 2026-05-14 00:00 |
20:26:03.40 |
-22:19:39.9 |
HIP 100769 |
16.09 |
| 2026-05-14 12:00 |
20:26:02.67 |
-22:19:43.5 |
HIP 100769 |
16.00 |
| 2026-05-15 00:00 |
20:26:01.94 |
-22:19:47.1 |
HIP 100769 |
15.92 |
| 2026-05-15 12:00 |
20:26:01.18 |
-22:19:50.9 |
HIP 100769 |
15.83 |
| 2026-05-16 00:00 |
20:26:00.41 |
-22:19:54.6 |
HIP 100769 |
15.75 |
| 2026-05-16 12:00 |
20:25:59.62 |
-22:19:58.5 |
HIP 100769 |
15.66 |
| 2026-05-17 00:00 |
20:25:58.81 |
-22:20:02.4 |
HIP 100769 |
15.58 |
| 2026-05-17 12:00 |
20:25:57.99 |
-22:20:06.3 |
HIP 100769 |
15.50 |
| 2026-05-18 00:00 |
20:25:57.15 |
-22:20:10.3 |
HIP 100769 |
15.41 |
| 2026-05-18 12:00 |
20:25:56.29 |
-22:20:14.3 |
HIP 100769 |
15.33 |
| 2026-05-19 00:00 |
20:25:55.42 |
-22:20:18.4 |
HIP 100769 |
15.25 |
| 2026-05-19 12:00 |
20:25:54.53 |
-22:20:22.5 |
HIP 100769 |
15.18 |
| 2026-05-20 00:00 |
20:25:53.63 |
-22:20:26.7 |
HIP 100769 |
15.10 |
| 2026-05-20 12:00 |
20:25:52.71 |
-22:20:30.9 |
HIP 100769 |
15.03 |
| 2026-05-21 00:00 |
20:25:51.77 |
-22:20:35.2 |
HIP 100769 |
14.95 |
| 2026-05-21 12:00 |
20:25:50.82 |
-22:20:39.5 |
HIP 100769 |
14.89 |
| 2026-05-22 00:00 |
20:25:49.85 |
-22:20:43.9 |
HIP 100769 |
14.82 |
| 2026-05-22 12:00 |
20:25:48.86 |
-22:20:48.3 |
HIP 100769 |
14.75 |
| 2026-05-23 00:00 |
20:25:47.86 |
-22:20:52.8 |
HIP 100769 |
14.69 |
| 2026-05-23 12:00 |
20:25:46.84 |
-22:20:57.3 |
HIP 100769 |
14.64 |
| 2026-05-24 00:00 |
20:25:45.81 |
-22:21:01.9 |
HIP 100769 |
14.58 |
| 2026-05-24 12:00 |
20:25:44.76 |
-22:21:06.5 |
HIP 100769 |
14.53 |
| 2026-05-25 00:00 |
20:25:43.70 |
-22:21:11.1 |
HIP 100769 |
14.49 |
| 2026-05-25 12:00 |
20:25:42.62 |
-22:21:15.8 |
HIP 100769 |
14.45 |
| 2026-05-26 00:00 |
20:25:41.53 |
-22:21:20.6 |
HIP 100769 |
14.41 |
| 2026-05-26 12:00 |
20:25:40.42 |
-22:21:25.4 |
HIP 100769 |
14.38 |
| 2026-05-27 00:00 |
20:25:39.29 |
-22:21:30.2 |
HIP 100769 |
14.35 |
| 2026-05-27 12:00 |
20:25:38.15 |
-22:21:35.1 |
HIP 100769 |
14.33 |
| 2026-05-28 00:00 |
20:25:36.99 |
-22:21:40.0 |
HIP 100769 |
14.31 |
| 2026-05-28 12:00 |
20:25:35.82 |
-22:21:44.9 |
HIP 100769 |
14.30 |
| 2026-05-29 00:00 |
20:25:34.64 |
-22:21:50.0 |
HIP 100769 |
14.29 |
| 2026-05-29 12:00 |
20:25:33.44 |
-22:21:55.0 |
HIP 100769 |
14.29 |
| 2026-05-30 00:00 |
20:25:32.22 |
-22:22:00.1 |
HIP 100769 |
14.30 |
| 2026-05-30 12:00 |
20:25:30.99 |
-22:22:05.2 |
HIP 100769 |
14.31 |
| 2026-05-31 00:00 |
20:25:29.75 |
-22:22:10.4 |
HIP 100769 |
14.33 |
| 2026-05-31 12:00 |
20:25:28.49 |
-22:22:15.6 |
HIP 100769 |
14.36 |
| 2026-06-01 00:00 |
20:25:27.22 |
-22:22:20.8 |
HIP 100769 |
14.39 |
| 2026-06-01 12:00 |
20:25:25.93 |
-22:22:26.1 |
HIP 100769 |
14.44 |
| 2026-06-02 00:00 |
20:25:24.63 |
-22:22:31.4 |
HIP 100769 |
14.48 |