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) |
| 2026-03-26 00:00 |
20:25:50.13 |
-22:18:26.6 |
HIP 100769 |
17.10 |
| 2026-03-26 12:00 |
20:25:51.08 |
-22:18:24.4 |
HIP 100769 |
17.14 |
| 2026-03-27 00:00 |
20:25:52.02 |
-22:18:22.3 |
HIP 100769 |
17.17 |
| 2026-03-27 12:00 |
20:25:52.94 |
-22:18:20.3 |
HIP 100769 |
17.20 |
| 2026-03-28 00:00 |
20:25:53.85 |
-22:18:18.3 |
HIP 100769 |
17.24 |
| 2026-03-28 12:00 |
20:25:54.74 |
-22:18:16.4 |
HIP 100769 |
17.28 |
| 2026-03-29 00:00 |
20:25:55.61 |
-22:18:14.5 |
HIP 100769 |
17.32 |
| 2026-03-29 12:00 |
20:25:56.47 |
-22:18:12.7 |
HIP 100769 |
17.36 |
| 2026-03-30 00:00 |
20:25:57.31 |
-22:18:10.9 |
HIP 100769 |
17.40 |
| 2026-03-30 12:00 |
20:25:58.14 |
-22:18:09.2 |
HIP 100769 |
17.44 |
| 2026-03-31 00:00 |
20:25:58.95 |
-22:18:07.6 |
HIP 100769 |
17.49 |
| 2026-03-31 12:00 |
20:25:59.75 |
-22:18:06.0 |
HIP 100769 |
17.53 |
| 2026-04-01 00:00 |
20:26:00.52 |
-22:18:04.5 |
HIP 100769 |
17.57 |
| 2026-04-01 12:00 |
20:26:01.29 |
-22:18:03.1 |
HIP 100769 |
17.62 |
| 2026-04-02 00:00 |
20:26:02.03 |
-22:18:01.7 |
HIP 100769 |
17.66 |
| 2026-04-02 12:00 |
20:26:02.76 |
-22:18:00.3 |
HIP 100769 |
17.71 |
| 2026-04-03 00:00 |
20:26:03.48 |
-22:17:59.1 |
HIP 100769 |
17.75 |
| 2026-04-03 12:00 |
20:26:04.18 |
-22:17:57.8 |
HIP 100769 |
17.80 |
| 2026-04-04 00:00 |
20:26:04.86 |
-22:17:56.7 |
HIP 100769 |
17.84 |
| 2026-04-04 12:00 |
20:26:05.52 |
-22:17:55.6 |
HIP 100769 |
17.88 |
| 2026-04-05 00:00 |
20:26:06.17 |
-22:17:54.6 |
HIP 100769 |
17.93 |
| 2026-04-05 12:00 |
20:26:06.80 |
-22:17:53.6 |
HIP 100769 |
17.97 |
| 2026-04-06 00:00 |
20:26:07.42 |
-22:17:52.7 |
HIP 100769 |
18.01 |
| 2026-04-06 12:00 |
20:26:08.02 |
-22:17:51.8 |
HIP 100769 |
18.06 |
| 2026-04-07 00:00 |
20:26:08.60 |
-22:17:51.0 |
HIP 100769 |
18.10 |
| 2026-04-07 12:00 |
20:26:09.16 |
-22:17:50.3 |
HIP 100769 |
18.14 |
| 2026-04-08 00:00 |
20:26:09.71 |
-22:17:49.6 |
HIP 100769 |
18.17 |
| 2026-04-08 12:00 |
20:26:10.24 |
-22:17:49.0 |
HIP 100769 |
18.21 |
| 2026-04-09 00:00 |
20:26:10.76 |
-22:17:48.5 |
HIP 100769 |
18.25 |
| 2026-04-09 12:00 |
20:26:11.26 |
-22:17:48.0 |
HIP 100769 |
18.28 |
| 2026-04-10 00:00 |
20:26:11.74 |
-22:17:47.6 |
HIP 100769 |
18.32 |
| 2026-04-10 12:00 |
20:26:12.20 |
-22:17:47.2 |
HIP 100769 |
18.35 |
| 2026-04-11 00:00 |
20:26:12.65 |
-22:17:46.9 |
HIP 100769 |
18.38 |
| 2026-04-11 12:00 |
20:26:13.08 |
-22:17:46.6 |
HIP 100769 |
18.41 |
| 2026-04-12 00:00 |
20:26:13.49 |
-22:17:46.5 |
HIP 100769 |
18.44 |
| 2026-04-12 12:00 |
20:26:13.88 |
-22:17:46.3 |
HIP 100769 |
18.47 |
| 2026-04-13 00:00 |
20:26:14.26 |
-22:17:46.3 |
HIP 100769 |
18.49 |
| 2026-04-13 12:00 |
20:26:14.62 |
-22:17:46.3 |
HIP 100769 |
18.51 |
| 2026-04-14 00:00 |
20:26:14.96 |
-22:17:46.4 |
HIP 100769 |
18.54 |
| 2026-04-14 12:00 |
20:26:15.29 |
-22:17:46.5 |
HIP 100769 |
18.56 |
| 2026-04-15 00:00 |
20:26:15.60 |
-22:17:46.7 |
HIP 100769 |
18.57 |
| 2026-04-15 12:00 |
20:26:15.89 |
-22:17:46.9 |
HIP 100769 |
18.59 |
| 2026-04-16 00:00 |
20:26:16.16 |
-22:17:47.2 |
HIP 100769 |
18.60 |