Comet Archive

Clear skies!

C/2009 T1 (McNaught)

メタデータ

項目 値
Designation C/2009 T1 (McNaught)
Type C
Perihelion (tp_cal, UTC) 2009-10-08T06:04:38.959680Z
Orbit solution date (soln_date, UTC) 2021-04-15T23:31:34Z
Obs used 141
NEO -
M1 8.100
K1 7.500
PC 0.030
オスキュレーティング軌道要素
項目 値
Epoch (epoch_cal, TDB) 2010-04-02.0000000
e 0.99830743
q (au) 6.220409
a (au) 3675.119595
i (deg) 89.893932
Ω (om, deg) 54.407386
ω (w, deg) 282.529051
M (ma, deg) 0.000777

等級

C/2009 T1 (McNaught) · Magnitude (Full range)

散乱 + 全体線形

$$ M_a = (1.547 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$

モデル定数

項目 値
H0 1.547
n 6.000
gf 0.980
gb -1.000
k 1.000
δ90 9.901
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)
2026-02-03 00:00 01:27:07.15 +64:32:19.5 HIP 6779 10.33
2026-02-03 12:00 01:27:09.47 +64:31:44.1 HIP 6779 10.92
2026-02-04 00:00 01:27:11.85 +64:31:09.0 HIP 6779 11.51
2026-02-04 12:00 01:27:14.30 +64:30:34.1 HIP 6779 12.10
2026-02-05 00:00 01:27:16.81 +64:29:59.5 HIP 6779 12.69
2026-02-05 12:00 01:27:19.39 +64:29:25.2 HIP 6779 13.28
2026-02-06 00:00 01:27:22.03 +64:28:51.1 HIP 6779 13.87
2026-02-06 12:00 01:27:24.73 +64:28:17.3 HIP 6779 14.46
2026-02-07 00:00 01:27:27.50 +64:27:43.8 HIP 6779 15.06
2026-02-07 12:00 01:27:30.33 +64:27:10.5 HIP 6779 15.65
2026-02-08 00:00 01:27:33.23 +64:26:37.6 HIP 6779 16.24
2026-02-08 12:00 01:27:36.18 +64:26:04.9 HIP 6779 16.83
2026-02-09 00:00 01:27:39.20 +64:25:32.5 HIP 6779 17.42
2026-02-09 12:00 01:27:42.28 +64:25:00.4 HIP 6779 18.00
2026-02-10 00:00 01:27:45.43 +64:24:28.6 HIP 6779 18.59
2026-02-10 12:00 01:27:48.63 +64:23:57.1 HIP 6779 19.18
2026-02-11 00:00 01:27:51.89 +64:23:25.9 HIP 6779 19.77
2026-02-11 12:00 01:27:55.22 +64:22:55.0 HIP 6779 20.35
2026-02-12 00:00 01:27:58.60 +64:22:24.3 HIP 6779 20.94
2026-02-12 12:00 01:28:02.04 +64:21:54.0 HIP 6779 21.52
2026-02-13 00:00 01:28:05.55 +64:21:24.0 HIP 6779 22.10
2026-02-13 12:00 01:28:09.11 +64:20:54.3 HIP 6779 22.69
2026-02-14 00:00 01:28:12.73 +64:20:24.9 HIP 6779 23.27
2026-02-14 12:00 01:28:16.41 +64:19:55.8 HIP 6779 23.85
2026-02-15 00:00 01:28:20.15 +64:19:27.1 HIP 6779 24.43
2026-02-15 12:00 01:28:23.94 +64:18:58.6 HIP 6779 25.01
2026-02-16 00:00 01:28:27.79 +64:18:30.5 HIP 6779 25.59
2026-02-16 12:00 01:28:31.70 +64:18:02.7 HIP 6779 26.17
2026-02-17 00:00 01:28:35.66 +64:17:35.2 HIP 6779 26.74
2026-02-17 12:00 01:28:39.68 +64:17:08.1 HIP 6779 27.32
2026-02-18 00:00 01:28:43.75 +64:16:41.3 HIP 6779 27.90
2026-02-18 12:00 01:28:47.88 +64:16:14.8 HIP 6779 28.47
2026-02-19 00:00 01:28:52.06 +64:15:48.6 HIP 6779 29.04
2026-02-19 12:00 01:28:56.30 +64:15:22.8 HIP 7224 28.76
2026-02-20 00:00 01:29:00.59 +64:14:57.3 HIP 7224 28.18
2026-02-20 12:00 01:29:04.94 +64:14:32.1 HIP 7224 27.60
2026-02-21 00:00 01:29:09.33 +64:14:07.3 HIP 7224 27.02
2026-02-21 12:00 01:29:13.78 +64:13:42.8 HIP 7224 26.44
2026-02-22 00:00 01:29:18.28 +64:13:18.7 HIP 7224 25.86
2026-02-22 12:00 01:29:22.83 +64:12:54.9 HIP 7224 25.27
2026-02-23 00:00 01:29:27.43 +64:12:31.5 HIP 7224 24.68
2026-02-23 12:00 01:29:32.08 +64:12:08.4 HIP 7224 24.10
2026-02-24 00:00 01:29:36.78 +64:11:45.6 HIP 7224 23.51