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)
2026-06-01 00:00	00:58:02.99	-15:00:14.4	HIP 4489	10.59
2026-06-01 12:00	00:58:12.79	-15:00:07.7	HIP 4489	12.26
2026-06-02 00:00	00:58:22.53	-15:00:01.7	HIP 4597	11.68
2026-06-02 12:00	00:58:32.20	-14:59:56.5	HIP 4597	10.55
2026-06-03 00:00	00:58:41.80	-14:59:52.1	HIP 4597	9.84
2026-06-03 12:00	00:58:51.33	-14:59:48.4	HIP 4597	9.64
2026-06-04 00:00	00:59:00.80	-14:59:45.4	HIP 4597	9.97
2026-06-04 12:00	00:59:10.20	-14:59:43.1	HIP 4597	10.76
2026-06-05 00:00	00:59:19.53	-14:59:41.6	HIP 4597	11.92
2026-06-05 12:00	00:59:28.79	-14:59:40.8	HIP 4597	13.34
2026-06-06 00:00	00:59:37.98	-14:59:40.8	HIP 4597	14.94
2026-06-06 12:00	00:59:47.10	-14:59:41.5	HIP 4597	16.66
2026-06-07 00:00	00:59:56.15	-14:59:43.0	HIP 4597	18.47
2026-06-07 12:00	01:00:05.12	-14:59:45.2	HIP 4597	20.32
2026-06-08 00:00	01:00:14.03	-14:59:48.2	HIP 4597	22.21
2026-06-08 12:00	01:00:22.86	-14:59:51.9	HIP 4814	20.40
2026-06-09 00:00	01:00:31.62	-14:59:56.3	HIP 4814	18.31
2026-06-09 12:00	01:00:40.31	-15:00:01.6	HIP 4814	16.24
2026-06-10 00:00	01:00:48.92	-15:00:07.5	HIP 4814	14.19
2026-06-10 12:00	01:00:57.46	-15:00:14.2	HIP 4814	12.18
2026-06-11 00:00	01:01:05.93	-15:00:21.7	HIP 4814	10.21
2026-06-11 12:00	01:01:14.31	-15:00:29.9	HIP 4814	8.30
2026-06-12 00:00	01:01:22.63	-15:00:38.9	HIP 4814	6.49
2026-06-12 12:00	01:01:30.86	-15:00:48.6	HIP 4814	4.86
2026-06-13 00:00	01:01:39.02	-15:00:59.0	HIP 4814	3.64
2026-06-13 12:00	01:01:47.10	-15:01:10.3	HIP 4814	3.29
2026-06-14 00:00	01:01:55.10	-15:01:22.2	HIP 4814	4.00
2026-06-14 12:00	01:02:03.03	-15:01:35.0	HIP 4814	5.36
2026-06-15 00:00	01:02:10.87	-15:01:48.5	HIP 4814	6.98
2026-06-15 12:00	01:02:18.63	-15:02:02.7	HIP 4814	8.71
2026-06-16 00:00	01:02:26.32	-15:02:17.7	HIP 4814	10.48
2026-06-16 12:00	01:02:33.92	-15:02:33.5	HIP 4814	12.27
2026-06-17 00:00	01:02:41.44	-15:02:49.9	HIP 4814	14.06
2026-06-17 12:00	01:02:48.88	-15:03:07.2	HIP 4814	15.84
2026-06-18 00:00	01:02:56.24	-15:03:25.2	HIP 4814	17.62
2026-06-18 12:00	01:03:03.52	-15:03:43.9	HIP 4814	19.39
2026-06-19 00:00	01:03:10.71	-15:04:03.4	HIP 4814	21.14
2026-06-19 12:00	01:03:17.82	-15:04:23.7	HIP 4937	22.23
2026-06-20 00:00	01:03:24.84	-15:04:44.6	HIP 4937	21.86
2026-06-20 12:00	01:03:31.79	-15:05:06.4	HIP 4937	21.61
2026-06-21 00:00	01:03:38.64	-15:05:28.8	HIP 4937	21.48
2026-06-21 12:00	01:03:45.42	-15:05:52.0	HIP 4937	21.47
2026-06-22 00:00	01:03:52.10	-15:06:16.0	HIP 4937	21.57