Comet Archive

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C/2016 B1 (NEOWISE)

メタデータ

項目 値
Designation C/2016 B1 (NEOWISE)
Type C
Perihelion (tp_cal, UTC) 2016-12-04T17:12:22.285440Z
Orbit solution date (soln_date, UTC) 2021-04-15T23:33:22Z
Obs used 522
NEO -
M1 10.500
K1 8.500
PC 0.030
オスキュレーティング軌道要素
項目 値
Epoch (epoch_cal, TDB) 2017-03-28.0000000
e 0.99239477
q (au) 3.206199
a (au) 421.578150
i (deg) 50.476159
Ω (om, deg) 231.954169
ω (w, deg) 8.559465
M (ma, deg) 0.012899

等級

C/2016 B1 (NEOWISE) · Magnitude (Full range)

散乱 + 全体線形

$$ M_a = (8.995 + 3.769\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$

モデル定数

項目 値
H0 8.995
n 3.769
gf 1.000
gb -0.508
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)
2026-02-03 00:00 00:44:29.67 +33:56:46.1 HIP 3418 13.22
2026-02-03 12:00 00:44:33.62 +33:56:24.4 HIP 3418 13.80
2026-02-04 00:00 00:44:37.60 +33:56:03.1 HIP 3418 14.43
2026-02-04 12:00 00:44:41.63 +33:55:42.2 HIP 3528 14.53
2026-02-05 00:00 00:44:45.70 +33:55:21.7 HIP 3528 14.00
2026-02-05 12:00 00:44:49.80 +33:55:01.6 HIP 3528 13.51
2026-02-06 00:00 00:44:53.95 +33:54:41.9 HIP 3528 13.08
2026-02-06 12:00 00:44:58.13 +33:54:22.6 HIP 3528 12.71
2026-02-07 00:00 00:45:02.35 +33:54:03.7 HIP 3528 12.40
2026-02-07 12:00 00:45:06.61 +33:53:45.2 HIP 3528 12.16
2026-02-08 00:00 00:45:10.91 +33:53:27.1 HIP 3528 12.00
2026-02-08 12:00 00:45:15.25 +33:53:09.4 HIP 3528 11.92
2026-02-09 00:00 00:45:19.63 +33:52:52.2 HIP 3528 11.93
2026-02-09 12:00 00:45:24.04 +33:52:35.3 HIP 3528 12.02
2026-02-10 00:00 00:45:28.49 +33:52:18.8 HIP 3528 12.20
2026-02-10 12:00 00:45:32.98 +33:52:02.8 HIP 3528 12.45
2026-02-11 00:00 00:45:37.50 +33:51:47.1 HIP 3528 12.79
2026-02-11 12:00 00:45:42.06 +33:51:31.9 HIP 3528 13.20
2026-02-12 00:00 00:45:46.66 +33:51:17.1 HIP 3528 13.68
2026-02-12 12:00 00:45:51.29 +33:51:02.7 HIP 3528 14.22
2026-02-13 00:00 00:45:55.96 +33:50:48.6 HIP 3528 14.82
2026-02-13 12:00 00:46:00.66 +33:50:35.0 HIP 3528 15.47
2026-02-14 00:00 00:46:05.40 +33:50:21.8 HIP 3528 16.17
2026-02-14 12:00 00:46:10.17 +33:50:09.1 HIP 3528 16.90
2026-02-15 00:00 00:46:14.98 +33:49:56.7 HIP 3528 17.68
2026-02-15 12:00 00:46:19.82 +33:49:44.7 HIP 3528 18.48
2026-02-16 00:00 00:46:24.69 +33:49:33.1 HIP 3528 19.32
2026-02-16 12:00 00:46:29.59 +33:49:22.0 HIP 3528 20.19
2026-02-17 00:00 00:46:34.53 +33:49:11.2 HIP 3528 21.07
2026-02-17 12:00 00:46:39.51 +33:49:00.9 HIP 3528 21.98
2026-02-18 00:00 00:46:44.51 +33:48:51.0 HIP 3528 22.92
2026-02-18 12:00 00:46:49.54 +33:48:41.4 HIP 3528 23.86
2026-02-19 00:00 00:46:54.61 +33:48:32.3 HIP 3528 24.83
2026-02-19 12:00 00:46:59.71 +33:48:23.6 HIP 3528 25.81
2026-02-20 00:00 00:47:04.84 +33:48:15.3 HIP 3528 26.81
2026-02-20 12:00 00:47:10.00 +33:48:07.4 HIP 3528 27.82
2026-02-21 00:00 00:47:15.18 +33:48:00.0 HIP 3528 28.84
2026-02-21 12:00 00:47:20.40 +33:47:52.8 HIP 3528 29.88
2026-02-22 00:00 00:47:25.65 +33:47:46.1 HIP 3528 30.92
2026-02-22 12:00 00:47:30.93 +33:47:39.9 HIP 3528 31.98
2026-02-23 00:00 00:47:36.23 +33:47:34.0 HIP 3528 33.05
2026-02-23 12:00 00:47:41.56 +33:47:28.5 HIP 3528 34.12
2026-02-24 00:00 00:47:46.92 +33:47:23.4 HIP 3528 35.21