C/1999 T1 (McNaught-Hartley)
メタデータ
| 項目 |
値 |
| Designation |
C/1999 T1 (McNaught-Hartley) |
| Type |
C |
| Perihelion (tp_cal, UTC) |
2000-12-13T11:19:42.432960Z |
| Orbit solution date (soln_date, UTC) |
2021-04-15T23:30:02Z |
| Obs used |
661 |
| NEO |
- |
| M1 |
8.300 |
| K1 |
7.500 |
| PC |
- |
オスキュレーティング軌道要素
| 項目 |
値 |
| Epoch (epoch_cal, TDB) |
2000-11-18.0000000 |
| e |
0.99985577 |
| q (au) |
1.171699 |
| a (au) |
8123.927279 |
| i (deg) |
79.975213 |
| Ω (om, deg) |
182.483007 |
| ω (w, deg) |
344.758001 |
| M (ma, deg) |
359.999966 |
等級
散乱 + 全体線形
$$
M_a = (5.381 + 4.354\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta
$$
$$
\theta = 180^\circ - \alpha
$$
$$
\Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b)
$$
$$
\Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1
$$
モデル定数
| 項目 |
値 |
| H0 |
5.381 |
| n |
4.354 |
| gf |
0.998 |
| gb |
-0.917 |
| k |
0.998 |
| δ90 |
9.997 |
| 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 |
| 1999-10-07 |
1999-12-31 |
+18.2603 |
-13.320 |
| 1999-12-31 |
2000-03-01 |
-14.7026 |
+8.027 |
| 2000-03-01 |
2000-12-12 |
-1.8794 |
+0.327 |
| 2000-12-15 |
2001-11-05 |
+1.3647 |
-0.126 |
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 |
22:46:30.52 |
+27:26:04.2 |
HIP 112250 |
32.87 |
| 2026-02-03 12:00 |
22:46:32.93 |
+27:26:04.1 |
HIP 112250 |
33.38 |
| 2026-02-04 00:00 |
22:46:35.35 |
+27:26:04.1 |
HIP 112680 |
33.43 |
| 2026-02-04 12:00 |
22:46:37.77 |
+27:26:04.4 |
HIP 112680 |
32.90 |
| 2026-02-05 00:00 |
22:46:40.21 |
+27:26:04.9 |
HIP 112680 |
32.37 |
| 2026-02-05 12:00 |
22:46:42.65 |
+27:26:05.6 |
HIP 112680 |
31.83 |
| 2026-02-06 00:00 |
22:46:45.10 |
+27:26:06.5 |
HIP 112680 |
31.30 |
| 2026-02-06 12:00 |
22:46:47.56 |
+27:26:07.6 |
HIP 112680 |
30.76 |
| 2026-02-07 00:00 |
22:46:50.03 |
+27:26:08.9 |
HIP 112680 |
30.22 |
| 2026-02-07 12:00 |
22:46:52.51 |
+27:26:10.5 |
HIP 112680 |
29.68 |
| 2026-02-08 00:00 |
22:46:54.99 |
+27:26:12.2 |
HIP 112680 |
29.14 |
| 2026-02-08 12:00 |
22:46:57.48 |
+27:26:14.2 |
HIP 112680 |
28.60 |
| 2026-02-09 00:00 |
22:46:59.98 |
+27:26:16.3 |
HIP 112680 |
28.06 |
| 2026-02-09 12:00 |
22:47:02.49 |
+27:26:18.7 |
HIP 112680 |
27.52 |
| 2026-02-10 00:00 |
22:47:05.00 |
+27:26:21.3 |
HIP 112680 |
26.98 |
| 2026-02-10 12:00 |
22:47:07.53 |
+27:26:24.1 |
HIP 112680 |
26.44 |
| 2026-02-11 00:00 |
22:47:10.05 |
+27:26:27.1 |
HIP 112680 |
25.89 |
| 2026-02-11 12:00 |
22:47:12.59 |
+27:26:30.3 |
HIP 112680 |
25.35 |
| 2026-02-12 00:00 |
22:47:15.13 |
+27:26:33.7 |
HIP 112680 |
24.81 |
| 2026-02-12 12:00 |
22:47:17.68 |
+27:26:37.3 |
HIP 112680 |
24.27 |
| 2026-02-13 00:00 |
22:47:20.23 |
+27:26:41.2 |
HIP 112680 |
23.73 |
| 2026-02-13 12:00 |
22:47:22.79 |
+27:26:45.2 |
HIP 112680 |
23.19 |
| 2026-02-14 00:00 |
22:47:25.36 |
+27:26:49.4 |
HIP 112680 |
22.65 |
| 2026-02-14 12:00 |
22:47:27.93 |
+27:26:53.9 |
HIP 112680 |
22.12 |
| 2026-02-15 00:00 |
22:47:30.51 |
+27:26:58.5 |
HIP 112680 |
21.58 |
| 2026-02-15 12:00 |
22:47:33.09 |
+27:27:03.4 |
HIP 112680 |
21.05 |
| 2026-02-16 00:00 |
22:47:35.68 |
+27:27:08.5 |
HIP 112680 |
20.52 |
| 2026-02-16 12:00 |
22:47:38.27 |
+27:27:13.7 |
HIP 112680 |
19.99 |
| 2026-02-17 00:00 |
22:47:40.87 |
+27:27:19.2 |
HIP 112680 |
19.47 |
| 2026-02-17 12:00 |
22:47:43.47 |
+27:27:24.9 |
HIP 112680 |
18.95 |
| 2026-02-18 00:00 |
22:47:46.07 |
+27:27:30.7 |
HIP 112680 |
18.43 |
| 2026-02-18 12:00 |
22:47:48.68 |
+27:27:36.8 |
HIP 112680 |
17.92 |
| 2026-02-19 00:00 |
22:47:51.30 |
+27:27:43.1 |
HIP 112680 |
17.41 |
| 2026-02-19 12:00 |
22:47:53.91 |
+27:27:49.5 |
HIP 112680 |
16.91 |
| 2026-02-20 00:00 |
22:47:56.53 |
+27:27:56.2 |
HIP 112680 |
16.42 |
| 2026-02-20 12:00 |
22:47:59.16 |
+27:28:03.1 |
HIP 112680 |
15.93 |
| 2026-02-21 00:00 |
22:48:01.78 |
+27:28:10.1 |
HIP 112680 |
15.45 |
| 2026-02-21 12:00 |
22:48:04.41 |
+27:28:17.4 |
HIP 112680 |
14.98 |
| 2026-02-22 00:00 |
22:48:07.05 |
+27:28:24.8 |
HIP 112680 |
14.52 |
| 2026-02-22 12:00 |
22:48:09.68 |
+27:28:32.5 |
HIP 112680 |
14.08 |
| 2026-02-23 00:00 |
22:48:12.32 |
+27:28:40.3 |
HIP 112680 |
13.64 |
| 2026-02-23 12:00 |
22:48:14.96 |
+27:28:48.4 |
HIP 112680 |
13.22 |
| 2026-02-24 00:00 |
22:48:17.60 |
+27:28:56.6 |
HIP 112680 |
12.82 |