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 |
2000-01-03 |
+19.0075 |
-13.853 |
| 2000-01-03 |
2000-12-12 |
-2.2203 |
+0.385 |
| 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) |
| 2026-05-12 00:00 |
22:53:42.16 |
+28:16:15.1 |
HIP 113092 |
16.56 |
| 2026-05-12 12:00 |
22:53:43.15 |
+28:16:38.0 |
HIP 113092 |
16.83 |
| 2026-05-13 00:00 |
22:53:44.12 |
+28:17:01.0 |
HIP 113092 |
17.11 |
| 2026-05-13 12:00 |
22:53:45.07 |
+28:17:23.9 |
HIP 113092 |
17.40 |
| 2026-05-14 00:00 |
22:53:46.00 |
+28:17:46.7 |
HIP 113092 |
17.69 |
| 2026-05-14 12:00 |
22:53:46.90 |
+28:18:09.6 |
HIP 113092 |
17.99 |
| 2026-05-15 00:00 |
22:53:47.79 |
+28:18:32.4 |
HIP 113092 |
18.30 |
| 2026-05-15 12:00 |
22:53:48.66 |
+28:18:55.2 |
HIP 113092 |
18.61 |
| 2026-05-16 00:00 |
22:53:49.51 |
+28:19:17.9 |
HIP 113063 |
18.26 |
| 2026-05-16 12:00 |
22:53:50.34 |
+28:19:40.6 |
HIP 113063 |
17.88 |
| 2026-05-17 00:00 |
22:53:51.14 |
+28:20:03.3 |
HIP 113063 |
17.51 |
| 2026-05-17 12:00 |
22:53:51.93 |
+28:20:25.9 |
HIP 113063 |
17.14 |
| 2026-05-18 00:00 |
22:53:52.69 |
+28:20:48.5 |
HIP 113063 |
16.77 |
| 2026-05-18 12:00 |
22:53:53.43 |
+28:21:11.1 |
HIP 113063 |
16.40 |
| 2026-05-19 00:00 |
22:53:54.16 |
+28:21:33.6 |
HIP 113063 |
16.04 |
| 2026-05-19 12:00 |
22:53:54.86 |
+28:21:56.1 |
HIP 113063 |
15.68 |
| 2026-05-20 00:00 |
22:53:55.54 |
+28:22:18.5 |
HIP 113063 |
15.32 |
| 2026-05-20 12:00 |
22:53:56.20 |
+28:22:40.8 |
HIP 113063 |
14.97 |
| 2026-05-21 00:00 |
22:53:56.83 |
+28:23:03.2 |
HIP 113063 |
14.61 |
| 2026-05-21 12:00 |
22:53:57.45 |
+28:23:25.4 |
HIP 113063 |
14.26 |
| 2026-05-22 00:00 |
22:53:58.05 |
+28:23:47.6 |
HIP 113063 |
13.91 |
| 2026-05-22 12:00 |
22:53:58.62 |
+28:24:09.8 |
HIP 113063 |
13.57 |
| 2026-05-23 00:00 |
22:53:59.17 |
+28:24:31.9 |
HIP 113063 |
13.23 |
| 2026-05-23 12:00 |
22:53:59.71 |
+28:24:53.9 |
HIP 113063 |
12.89 |
| 2026-05-24 00:00 |
22:54:00.22 |
+28:25:15.9 |
HIP 113063 |
12.55 |
| 2026-05-24 12:00 |
22:54:00.71 |
+28:25:37.8 |
HIP 113063 |
12.21 |
| 2026-05-25 00:00 |
22:54:01.17 |
+28:25:59.7 |
HIP 113063 |
11.88 |
| 2026-05-25 12:00 |
22:54:01.62 |
+28:26:21.4 |
HIP 113063 |
11.55 |
| 2026-05-26 00:00 |
22:54:02.04 |
+28:26:43.2 |
HIP 113063 |
11.22 |
| 2026-05-26 12:00 |
22:54:02.45 |
+28:27:04.8 |
HIP 113063 |
10.90 |
| 2026-05-27 00:00 |
22:54:02.83 |
+28:27:26.4 |
HIP 113063 |
10.58 |
| 2026-05-27 12:00 |
22:54:03.19 |
+28:27:47.9 |
HIP 113063 |
10.26 |
| 2026-05-28 00:00 |
22:54:03.53 |
+28:28:09.3 |
HIP 113063 |
9.95 |
| 2026-05-28 12:00 |
22:54:03.85 |
+28:28:30.7 |
HIP 113063 |
9.63 |
| 2026-05-29 00:00 |
22:54:04.14 |
+28:28:52.0 |
HIP 113063 |
9.32 |
| 2026-05-29 12:00 |
22:54:04.42 |
+28:29:13.2 |
HIP 113063 |
9.02 |
| 2026-05-30 00:00 |
22:54:04.67 |
+28:29:34.3 |
HIP 113063 |
8.72 |
| 2026-05-30 12:00 |
22:54:04.90 |
+28:29:55.4 |
HIP 113063 |
8.42 |
| 2026-05-31 00:00 |
22:54:05.11 |
+28:30:16.4 |
HIP 113063 |
8.12 |
| 2026-05-31 12:00 |
22:54:05.30 |
+28:30:37.3 |
HIP 113063 |
7.83 |
| 2026-06-01 00:00 |
22:54:05.47 |
+28:30:58.1 |
HIP 113063 |
7.54 |
| 2026-06-01 12:00 |
22:54:05.61 |
+28:31:18.8 |
HIP 113063 |
7.26 |
| 2026-06-02 00:00 |
22:54:05.73 |
+28:31:39.4 |
HIP 113063 |
6.98 |