メタデータ

項目	値
Designation	334P/NEAT
Type	P
Perihelion (tp_cal, UTC)	2017-05-19T03:35:22.182720Z
Orbit solution date (soln_date, UTC)	2023-05-03T22:44:41Z
Obs used	404
NEO	-
M1	6.500
K1	15.250
PC	0.030

オスキュレーティング軌道要素

項目	値
Epoch (epoch_cal, TDB)	2010-10-20.0000000
e	0.35453120
q (au)	4.187661
a (au)	6.487782
i (deg)	19.057080
Ω (om, deg)	92.783588
ω (w, deg)	81.094516
M (ma, deg)	216.668886

等級

散乱 + 全体線形

$$ M_a = (6.001 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$

モデル定数

項目	値
H0	6.001
n	6.000
gf	0.912
gb	-0.905
k	1.000
δ90	6.338

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
2016-01-07	2017-05-18	+13.7133	-8.333

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)
2026-07-29 00:00	01:07:46.36	-16:07:27.9	HIP 5282	5.17
2026-07-29 12:00	01:07:45.75	-16:08:39.9	HIP 5282	4.15
2026-07-30 00:00	01:07:45.03	-16:09:52.4	HIP 5282	3.23
2026-07-30 12:00	01:07:44.22	-16:11:05.3	HIP 5282	2.55
2026-07-31 00:00	01:07:43.29	-16:12:18.7	HIP 5282	2.35
2026-07-31 12:00	01:07:42.27	-16:13:32.5	HIP 5282	2.74
2026-08-01 00:00	01:07:41.13	-16:14:46.8	HIP 5282	3.56
2026-08-01 12:00	01:07:39.90	-16:16:01.6	HIP 5282	4.58
2026-08-02 00:00	01:07:38.56	-16:17:16.7	HIP 5282	5.71
2026-08-02 12:00	01:07:37.12	-16:18:32.3	HIP 5282	6.90
2026-08-03 00:00	01:07:35.57	-16:19:48.3	HIP 5282	8.13
2026-08-03 12:00	01:07:33.92	-16:21:04.7	HIP 5282	9.40
2026-08-04 00:00	01:07:32.16	-16:22:21.5	HIP 5282	10.69
2026-08-04 12:00	01:07:30.30	-16:23:38.7	HIP 5282	11.99
2026-08-05 00:00	01:07:28.34	-16:24:56.4	HIP 5329	13.31
2026-08-05 12:00	01:07:26.27	-16:26:14.4	HIP 5329	12.91
2026-08-06 00:00	01:07:24.10	-16:27:32.7	HIP 5329	12.68
2026-08-06 12:00	01:07:21.83	-16:28:51.5	HIP 5329	12.63
2026-08-07 00:00	01:07:19.45	-16:30:10.6	HIP 5329	12.75
2026-08-07 12:00	01:07:16.97	-16:31:30.1	HIP 5329	13.06
2026-08-08 00:00	01:07:14.38	-16:32:49.9	HIP 5329	13.54
2026-08-08 12:00	01:07:11.69	-16:34:10.0	HIP 5329	14.18
2026-08-09 00:00	01:07:08.90	-16:35:30.5	HIP 5329	14.97
2026-08-09 12:00	01:07:06.00	-16:36:51.4	HIP 5329	15.88
2026-08-10 00:00	01:07:03.00	-16:38:12.5	HIP 5329	16.91
2026-08-10 12:00	01:06:59.90	-16:39:33.9	HIP 5329	18.03
2026-08-11 00:00	01:06:56.70	-16:40:55.7	HIP 5128	19.03
2026-08-11 12:00	01:06:53.39	-16:42:17.7	HIP 5128	18.67
2026-08-12 00:00	01:06:49.98	-16:43:40.0	HIP 5128	18.42
2026-08-12 12:00	01:06:46.47	-16:45:02.6	HIP 5128	18.29
2026-08-13 00:00	01:06:42.86	-16:46:25.4	HIP 5128	18.28
2026-08-13 12:00	01:06:39.15	-16:47:48.5	HIP 5128	18.40
2026-08-14 00:00	01:06:35.33	-16:49:11.8	HIP 5128	18.65
2026-08-14 12:00	01:06:31.42	-16:50:35.4	HIP 5128	19.03
2026-08-15 00:00	01:06:27.40	-16:51:59.1	HIP 5128	19.54
2026-08-15 12:00	01:06:23.29	-16:53:23.1	HIP 5128	20.17
2026-08-16 00:00	01:06:19.08	-16:54:47.3	HIP 5128	20.91
2026-08-16 12:00	01:06:14.77	-16:56:11.7	HIP 5128	21.76
2026-08-17 00:00	01:06:10.35	-16:57:36.3	HIP 5128	22.71
2026-08-17 12:00	01:06:05.85	-16:59:01.0	HIP 5128	23.74
2026-08-18 00:00	01:06:01.24	-17:00:25.9	HIP 5128	24.86
2026-08-18 12:00	01:05:56.54	-17:01:51.0	HIP 5128	26.06
2026-08-19 00:00	01:05:51.74	-17:03:16.2	HIP 5128	27.32