C/1999 Y1 (LINEAR)
メタデータ
| 項目 |
値 |
| Designation |
C/1999 Y1 (LINEAR) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2001-03-24T01:09:17.948160Z |
| Orbit solution date (soln_date, UTC) |
2022-04-30T03:12:26Z |
| Obs used |
833 |
| NEO |
- |
| M1 |
7.300 |
| K1 |
8.500 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2000-09-17.0000000 |
| e |
1.00085745 |
| q (au) |
3.091379 |
| a (au) |
-3605.302714 |
| i (deg) |
134.795873 |
| Ω (om, deg) |
188.877122 |
| ω (w, deg) |
184.264817 |
| M (ma, deg) |
-0.000856 |
等級
散乱 + 全体線形
$$
M_a = (5.335 + 5.484\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
5.335 |
| n |
5.484 |
| gf |
1.000 |
| gb |
-0.641 |
| k |
0.800 |
| 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
残差 (区間線形)
$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$
| 開始日 (UTC) |
終了日 (UTC) |
a |
b |
| 1999-10-29 |
2000-02-28 |
+21.2209 |
-14.967 |
| 2000-02-28 |
2001-02-21 |
-6.9073 |
+3.809 |
| 2001-05-31 |
2003-07-19 |
-4.9693 |
+2.340 |
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) |
| 2026-02-03 00:00 |
13:19:41.98 |
-28:13:40.0 |
HIP 65141 |
16.66 |
| 2026-02-03 12:00 |
13:19:40.84 |
-28:13:45.3 |
HIP 65141 |
16.92 |
| 2026-02-04 00:00 |
13:19:39.67 |
-28:13:50.4 |
HIP 65141 |
17.19 |
| 2026-02-04 12:00 |
13:19:38.49 |
-28:13:55.4 |
HIP 65141 |
17.46 |
| 2026-02-05 00:00 |
13:19:37.28 |
-28:14:00.2 |
HIP 64920 |
17.30 |
| 2026-02-05 12:00 |
13:19:36.05 |
-28:14:04.8 |
HIP 64920 |
17.02 |
| 2026-02-06 00:00 |
13:19:34.79 |
-28:14:09.3 |
HIP 64920 |
16.74 |
| 2026-02-06 12:00 |
13:19:33.52 |
-28:14:13.6 |
HIP 64920 |
16.45 |
| 2026-02-07 00:00 |
13:19:32.22 |
-28:14:17.8 |
HIP 64920 |
16.15 |
| 2026-02-07 12:00 |
13:19:30.89 |
-28:14:21.8 |
HIP 64920 |
15.86 |
| 2026-02-08 00:00 |
13:19:29.55 |
-28:14:25.6 |
HIP 64920 |
15.56 |
| 2026-02-08 12:00 |
13:19:28.18 |
-28:14:29.3 |
HIP 64920 |
15.26 |
| 2026-02-09 00:00 |
13:19:26.79 |
-28:14:32.8 |
HIP 64920 |
14.95 |
| 2026-02-09 12:00 |
13:19:25.38 |
-28:14:36.1 |
HIP 64920 |
14.64 |
| 2026-02-10 00:00 |
13:19:23.95 |
-28:14:39.3 |
HIP 64920 |
14.33 |
| 2026-02-10 12:00 |
13:19:22.49 |
-28:14:42.3 |
HIP 64920 |
14.01 |
| 2026-02-11 00:00 |
13:19:21.02 |
-28:14:45.1 |
HIP 64920 |
13.69 |
| 2026-02-11 12:00 |
13:19:19.52 |
-28:14:47.8 |
HIP 64920 |
13.37 |
| 2026-02-12 00:00 |
13:19:18.00 |
-28:14:50.3 |
HIP 64920 |
13.04 |
| 2026-02-12 12:00 |
13:19:16.46 |
-28:14:52.6 |
HIP 64920 |
12.72 |
| 2026-02-13 00:00 |
13:19:14.89 |
-28:14:54.8 |
HIP 64920 |
12.39 |
| 2026-02-13 12:00 |
13:19:13.31 |
-28:14:56.8 |
HIP 64920 |
12.06 |
| 2026-02-14 00:00 |
13:19:11.70 |
-28:14:58.6 |
HIP 64920 |
11.72 |
| 2026-02-14 12:00 |
13:19:10.07 |
-28:15:00.3 |
HIP 64920 |
11.39 |
| 2026-02-15 00:00 |
13:19:08.43 |
-28:15:01.8 |
HIP 64920 |
11.05 |
| 2026-02-15 12:00 |
13:19:06.76 |
-28:15:03.1 |
HIP 64920 |
10.71 |
| 2026-02-16 00:00 |
13:19:05.07 |
-28:15:04.2 |
HIP 64920 |
10.37 |
| 2026-02-16 12:00 |
13:19:03.36 |
-28:15:05.2 |
HIP 64920 |
10.03 |
| 2026-02-17 00:00 |
13:19:01.63 |
-28:15:06.0 |
HIP 64920 |
9.70 |
| 2026-02-17 12:00 |
13:18:59.88 |
-28:15:06.6 |
HIP 64920 |
9.36 |
| 2026-02-18 00:00 |
13:18:58.11 |
-28:15:07.1 |
HIP 64920 |
9.02 |
| 2026-02-18 12:00 |
13:18:56.31 |
-28:15:07.4 |
HIP 64920 |
8.69 |
| 2026-02-19 00:00 |
13:18:54.50 |
-28:15:07.5 |
HIP 64920 |
8.36 |
| 2026-02-19 12:00 |
13:18:52.67 |
-28:15:07.4 |
HIP 64920 |
8.03 |
| 2026-02-20 00:00 |
13:18:50.82 |
-28:15:07.2 |
HIP 64920 |
7.71 |
| 2026-02-20 12:00 |
13:18:48.95 |
-28:15:06.7 |
HIP 64920 |
7.40 |
| 2026-02-21 00:00 |
13:18:47.06 |
-28:15:06.2 |
HIP 64920 |
7.10 |
| 2026-02-21 12:00 |
13:18:45.15 |
-28:15:05.4 |
HIP 64920 |
6.81 |
| 2026-02-22 00:00 |
13:18:43.23 |
-28:15:04.5 |
HIP 64920 |
6.53 |
| 2026-02-22 12:00 |
13:18:41.28 |
-28:15:03.3 |
HIP 64920 |
6.26 |
| 2026-02-23 00:00 |
13:18:39.32 |
-28:15:02.1 |
HIP 64920 |
6.02 |
| 2026-02-23 12:00 |
13:18:37.33 |
-28:15:00.6 |
HIP 64920 |
5.80 |
| 2026-02-24 00:00 |
13:18:35.33 |
-28:14:59.0 |
HIP 64920 |
5.60 |