メタデータ

項目	値
Designation	473P/NEAT
Type	P
Perihelion (tp_cal, UTC)	2001-11-04T17:20:30.220800Z
Orbit solution date (soln_date, UTC)	2024-06-30T00:42:21Z
Obs used	520
NEO	-
M1	11.200
K1	25.750
PC	0.030

オスキュレーティング軌道要素

項目	値
Epoch (epoch_cal, TDB)	2008-08-01.0000000
e	0.82249544
q (au)	1.407115
a (au)	7.927206
i (deg)	56.948538
Ω (om, deg)	22.184978
ω (w, deg)	43.106501
M (ma, deg)	108.688703

等級

散乱 + 全体線形

$$ M_a = (14.080 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$

モデル定数

項目	値
H0	14.080
n	6.000
gf	1.000
gb	-1.000
k	0.800
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

残差 (区間線形)

$$\epsilon = a \log_{10} r_{\mathrm{au}} + b$$

開始日 (UTC)	終了日 (UTC)	a	b
2023-11-29	2024-05-08	+16.9214	-4.614
2024-05-08	2024-06-25	-14.5858	+3.980

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	13:00:39.25	-10:39:32.8	HIP 63520	20.82
2026-06-01 12:00	13:00:30.57	-10:39:18.9	HIP 63520	21.62
2026-06-02 00:00	13:00:22.03	-10:39:05.6	HIP 63520	22.58
2026-06-02 12:00	13:00:13.64	-10:38:53.0	HIP 63520	23.65
2026-06-03 00:00	13:00:05.38	-10:38:41.0	HIP 63520	24.83
2026-06-03 12:00	12:59:57.26	-10:38:29.6	HIP 63520	26.09
2026-06-04 00:00	12:59:49.29	-10:38:18.9	HIP 63520	27.40
2026-06-04 12:00	12:59:41.45	-10:38:08.8	HIP 63520	28.76
2026-06-05 00:00	12:59:33.75	-10:37:59.4	HIP 63520	30.15
2026-06-05 12:00	12:59:26.20	-10:37:50.6	HIP 63520	31.55
2026-06-06 00:00	12:59:18.78	-10:37:42.4	HIP 63520	32.98
2026-06-06 12:00	12:59:11.51	-10:37:35.0	HIP 63520	34.40
2026-06-07 00:00	12:59:04.38	-10:37:28.2	HIP 63202	34.72
2026-06-07 12:00	12:58:57.39	-10:37:22.0	HIP 63202	33.25
2026-06-08 00:00	12:58:50.54	-10:37:16.5	HIP 63202	31.82
2026-06-08 12:00	12:58:43.83	-10:37:11.7	HIP 63202	30.43
2026-06-09 00:00	12:58:37.27	-10:37:07.5	HIP 63202	29.11
2026-06-09 12:00	12:58:30.84	-10:37:04.1	HIP 63202	27.83
2026-06-10 00:00	12:58:24.56	-10:37:01.2	HIP 63202	26.61
2026-06-10 12:00	12:58:18.42	-10:36:59.1	HIP 63202	25.44
2026-06-11 00:00	12:58:12.42	-10:36:57.7	HIP 63202	24.32
2026-06-11 12:00	12:58:06.56	-10:36:56.9	HIP 63202	23.27
2026-06-12 00:00	12:58:00.85	-10:36:56.8	HIP 63202	22.27
2026-06-12 12:00	12:57:55.27	-10:36:57.4	HIP 63202	21.34
2026-06-13 00:00	12:57:49.84	-10:36:58.7	HIP 63202	20.46
2026-06-13 12:00	12:57:44.55	-10:37:00.7	HIP 63202	19.65
2026-06-14 00:00	12:57:39.40	-10:37:03.4	HIP 63202	18.91
2026-06-14 12:00	12:57:34.40	-10:37:06.8	HIP 63202	18.22
2026-06-15 00:00	12:57:29.53	-10:37:10.8	HIP 63202	17.60
2026-06-15 12:00	12:57:24.81	-10:37:15.6	HIP 63202	17.05
2026-06-16 00:00	12:57:20.23	-10:37:21.1	HIP 63202	16.56
2026-06-16 12:00	12:57:15.79	-10:37:27.2	HIP 63202	16.13
2026-06-17 00:00	12:57:11.49	-10:37:34.1	HIP 63202	15.76
2026-06-17 12:00	12:57:07.33	-10:37:41.7	HIP 63202	15.45
2026-06-18 00:00	12:57:03.31	-10:37:50.0	HIP 63202	15.20
2026-06-18 12:00	12:56:59.43	-10:37:58.9	HIP 63202	15.00
2026-06-19 00:00	12:56:55.69	-10:38:08.6	HIP 63202	14.84
2026-06-19 12:00	12:56:52.10	-10:38:19.0	HIP 63202	14.73
2026-06-20 00:00	12:56:48.64	-10:38:30.1	HIP 63202	14.65
2026-06-20 12:00	12:56:45.32	-10:38:41.9	HIP 63202	14.60
2026-06-21 00:00	12:56:42.14	-10:38:54.4	HIP 63202	14.59
2026-06-21 12:00	12:56:39.09	-10:39:07.6	HIP 63202	14.60
2026-06-22 00:00	12:56:36.19	-10:39:21.5	HIP 63202	14.62