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 |
-1.000 |
| 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 |
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 |
| 2026-06-02 12:00 |
20:25:23.31 |
-22:22:36.8 |
HIP 100769 |
14.54 |
| 2026-06-03 00:00 |
20:25:21.98 |
-22:22:42.2 |
HIP 100769 |
14.60 |
| 2026-06-03 12:00 |
20:25:20.64 |
-22:22:47.6 |
HIP 100769 |
14.68 |
| 2026-06-04 00:00 |
20:25:19.28 |
-22:22:53.1 |
HIP 100769 |
14.76 |
| 2026-06-04 12:00 |
20:25:17.91 |
-22:22:58.6 |
HIP 100769 |
14.84 |
| 2026-06-05 00:00 |
20:25:16.52 |
-22:23:04.2 |
HIP 100769 |
14.94 |
| 2026-06-05 12:00 |
20:25:15.13 |
-22:23:09.8 |
HIP 100769 |
15.04 |
| 2026-06-06 00:00 |
20:25:13.71 |
-22:23:15.4 |
HIP 100769 |
15.15 |
| 2026-06-06 12:00 |
20:25:12.29 |
-22:23:21.1 |
HIP 100769 |
15.27 |
| 2026-06-07 00:00 |
20:25:10.85 |
-22:23:26.8 |
HIP 100769 |
15.40 |
| 2026-06-07 12:00 |
20:25:09.39 |
-22:23:32.5 |
HIP 100769 |
15.54 |
| 2026-06-08 00:00 |
20:25:07.93 |
-22:23:38.3 |
HIP 100769 |
15.68 |
| 2026-06-08 12:00 |
20:25:06.45 |
-22:23:44.1 |
HIP 100769 |
15.83 |
| 2026-06-09 00:00 |
20:25:04.95 |
-22:23:49.9 |
HIP 100769 |
15.99 |
| 2026-06-09 12:00 |
20:25:03.45 |
-22:23:55.8 |
HIP 100769 |
16.16 |
| 2026-06-10 00:00 |
20:25:01.93 |
-22:24:01.7 |
HIP 100769 |
16.34 |
| 2026-06-10 12:00 |
20:25:00.40 |
-22:24:07.6 |
HIP 100769 |
16.52 |
| 2026-06-11 00:00 |
20:24:58.86 |
-22:24:13.6 |
HIP 100769 |
16.72 |
| 2026-06-11 12:00 |
20:24:57.30 |
-22:24:19.6 |
HIP 100769 |
16.92 |
| 2026-06-12 00:00 |
20:24:55.73 |
-22:24:25.6 |
HIP 100769 |
17.12 |
| 2026-06-12 12:00 |
20:24:54.15 |
-22:24:31.6 |
HIP 100769 |
17.34 |
| 2026-06-13 00:00 |
20:24:52.55 |
-22:24:37.7 |
HIP 100769 |
17.56 |
| 2026-06-13 12:00 |
20:24:50.95 |
-22:24:43.9 |
HIP 100769 |
17.79 |
| 2026-06-14 00:00 |
20:24:49.33 |
-22:24:50.0 |
HIP 100769 |
18.03 |
| 2026-06-14 12:00 |
20:24:47.70 |
-22:24:56.2 |
HIP 100769 |
18.27 |
| 2026-06-15 00:00 |
20:24:46.06 |
-22:25:02.4 |
HIP 100769 |
18.52 |
| 2026-06-15 12:00 |
20:24:44.41 |
-22:25:08.6 |
HIP 100769 |
18.78 |
| 2026-06-16 00:00 |
20:24:42.74 |
-22:25:14.9 |
HIP 100769 |
19.05 |
| 2026-06-16 12:00 |
20:24:41.07 |
-22:25:21.2 |
HIP 100769 |
19.32 |
| 2026-06-17 00:00 |
20:24:39.38 |
-22:25:27.5 |
HIP 100769 |
19.59 |
| 2026-06-17 12:00 |
20:24:37.68 |
-22:25:33.8 |
HIP 100769 |
19.88 |
| 2026-06-18 00:00 |
20:24:35.97 |
-22:25:40.2 |
HIP 100769 |
20.17 |
| 2026-06-18 12:00 |
20:24:34.25 |
-22:25:46.5 |
HIP 100769 |
20.47 |
| 2026-06-19 00:00 |
20:24:32.52 |
-22:25:53.0 |
HIP 100769 |
20.77 |
| 2026-06-19 12:00 |
20:24:30.78 |
-22:25:59.4 |
HIP 100769 |
21.08 |
| 2026-06-20 00:00 |
20:24:29.02 |
-22:26:05.8 |
HIP 100769 |
21.39 |
| 2026-06-20 12:00 |
20:24:27.26 |
-22:26:12.3 |
HIP 100769 |
21.71 |
| 2026-06-21 00:00 |
20:24:25.49 |
-22:26:18.8 |
HIP 100769 |
22.03 |
| 2026-06-21 12:00 |
20:24:23.70 |
-22:26:25.3 |
HIP 100769 |
22.36 |
| 2026-06-22 00:00 |
20:24:21.91 |
-22:26:31.9 |
HIP 100769 |
22.70 |