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)
2026-09-20 00:00	00:57:52.45	-18:31:34.2	HIP 4418	27.10
2026-09-20 12:00	00:57:42.86	-18:32:47.1	HIP 4418	24.70
2026-09-21 00:00	00:57:33.22	-18:33:59.4	HIP 4418	22.34
2026-09-21 12:00	00:57:23.55	-18:35:11.2	HIP 4418	20.04
2026-09-22 00:00	00:57:13.84	-18:36:22.4	HIP 4418	17.83
2026-09-22 12:00	00:57:04.09	-18:37:33.1	HIP 4418	15.73
2026-09-23 00:00	00:56:54.30	-18:38:43.1	HIP 4418	13.81
2026-09-23 12:00	00:56:44.48	-18:39:52.7	HIP 4418	12.15
2026-09-24 00:00	00:56:34.62	-18:41:01.6	HIP 4418	10.88
2026-09-24 12:00	00:56:24.73	-18:42:09.9	HIP 4362	8.30
2026-09-25 00:00	00:56:14.80	-18:43:17.6	HIP 4362	5.69
2026-09-25 12:00	00:56:04.85	-18:44:24.7	HIP 4362	3.08
2026-09-26 00:00	00:55:54.86	-18:45:31.2	HIP 4362	0.49
2026-09-26 12:00	00:55:44.85	-18:46:37.0	HIP 4362	2.15
2026-09-27 00:00	00:55:34.81	-18:47:42.2	HIP 4362	4.76
2026-09-27 12:00	00:55:24.75	-18:48:46.8	HIP 4362	7.37
2026-09-28 00:00	00:55:14.65	-18:49:50.6	HIP 4362	9.98
2026-09-28 12:00	00:55:04.54	-18:50:53.9	HIP 4362	12.60
2026-09-29 00:00	00:54:54.40	-18:51:56.4	HIP 4362	15.22
2026-09-29 12:00	00:54:44.24	-18:52:58.3	HIP 4362	17.83
2026-09-30 00:00	00:54:34.06	-18:53:59.5	HIP 4362	20.45
2026-09-30 12:00	00:54:23.86	-18:55:00.0	HIP 4362	23.06
2026-10-01 00:00	00:54:13.64	-18:55:59.7	HIP 4362	25.67
2026-10-01 12:00	00:54:03.41	-18:56:58.8	HIP 4362	28.28
2026-10-02 00:00	00:53:53.16	-18:57:57.1	HIP 4117	28.27
2026-10-02 12:00	00:53:42.90	-18:58:54.7	HIP 4117	27.81
2026-10-03 00:00	00:53:32.62	-18:59:51.6	HIP 4117	27.58
2026-10-03 12:00	00:53:22.34	-19:00:47.7	HIP 4117	27.58
2026-10-04 00:00	00:53:12.04	-19:01:43.1	HIP 4117	27.82
2026-10-04 12:00	00:53:01.73	-19:02:37.7	HIP 4063	26.61
2026-10-05 00:00	00:52:51.42	-19:03:31.5	HIP 4063	24.63
2026-10-05 12:00	00:52:41.10	-19:04:24.6	HIP 4063	22.79
2026-10-06 00:00	00:52:30.78	-19:05:16.8	HIP 4063	21.12
2026-10-06 12:00	00:52:20.45	-19:06:08.3	HIP 4063	19.66
2026-10-07 00:00	00:52:10.12	-19:06:59.0	HIP 4063	18.46
2026-10-07 12:00	00:51:59.79	-19:07:48.8	HIP 4063	17.58
2026-10-08 00:00	00:51:49.46	-19:08:37.8	HIP 4063	17.06
2026-10-08 12:00	00:51:39.13	-19:09:26.0	HIP 4063	16.93
2026-10-09 00:00	00:51:28.80	-19:10:13.4	HIP 4063	17.19
2026-10-09 12:00	00:51:18.48	-19:11:00.0	HIP 4063	17.84
2026-10-10 00:00	00:51:08.17	-19:11:45.6	HIP 4063	18.82
2026-10-10 12:00	00:50:57.86	-19:12:30.5	HIP 4063	20.09
2026-10-11 00:00	00:50:47.57	-19:13:14.4	HIP 4063	21.59