メタデータ

項目	値
Designation	215P/NEAT
Type	P
Perihelion (tp_cal, UTC)	2019-10-03T07:31:01.663680Z
Orbit solution date (soln_date, UTC)	2026-09-04T08:42:17Z
Obs used	1058
NEO	-
M1	8.800
K1	12.250
PC	0.030

オスキュレーティング軌道要素

項目	値
Epoch (epoch_cal, TDB)	2016-01-27.0000000
e	0.19497265
q (au)	3.500152
a (au)	4.347867
i (deg)	10.059260
Ω (om, deg)	61.163513
ω (w, deg)	255.414293
M (ma, deg)	213.744222

等級

散乱 + 全体線形

$$ M_a = (11.686 + 6.000\cdot 2.5\log_{10} r) + \epsilon - 2.5\log_{10}\Phi(\theta) + 5\log_{10}\Delta $$ $$ \theta = 180^\circ - \alpha $$ $$ \Phi(\theta) = \frac{\delta_{90} D(\theta) + 1}{\delta_{90} + 1},\quad D(\theta) = k\cdot \Phi_{HG}(\theta; g_f) + (1-k)\cdot \Phi_{HG}(\theta; g_b) $$ $$ \Phi_{HG}(\theta; g) = \left(\frac{1+g^2}{1+g^2-2g\cos\theta}\right)^{3/2},\quad \Phi_{HG}(90^\circ)=1 $$

モデル定数

項目	値
H0	11.686
n	6.000
gf	1.000
gb	-0.793
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

ファインディングチャート

天体暦

Date/Time (UTC)	RA (J2000)	Dec (J2000)	Nearest HIP	Dist from HIP (arcmin)
2026-09-20 00:00	13:45:20.44	-07:07:20.4	HIP 67082	31.27
2026-09-20 12:00	13:45:47.50	-07:10:32.6	HIP 67082	30.24
2026-09-21 00:00	13:46:14.62	-07:13:44.9	HIP 67082	31.02
2026-09-21 12:00	13:46:41.81	-07:16:57.1	HIP 67082	33.50
2026-09-22 00:00	13:47:09.07	-07:20:09.5	HIP 67433	30.85
2026-09-22 12:00	13:47:36.39	-07:23:21.8	HIP 67433	24.47
2026-09-23 00:00	13:48:03.77	-07:26:34.2	HIP 67433	18.92
2026-09-23 12:00	13:48:31.22	-07:29:46.5	HIP 67433	15.16
2026-09-24 00:00	13:48:58.73	-07:32:58.9	HIP 67433	14.65
2026-09-24 12:00	13:49:26.31	-07:36:11.3	HIP 67553	16.41
2026-09-25 00:00	13:49:53.95	-07:39:23.7	HIP 67553	10.18
2026-09-25 12:00	13:50:21.65	-07:42:36.1	HIP 67553	7.21
2026-09-26 00:00	13:50:49.41	-07:45:48.6	HIP 67578	1.29
2026-09-26 12:00	13:51:17.24	-07:49:01.0	HIP 67578	6.83
2026-09-27 00:00	13:51:45.12	-07:52:13.4	HIP 67718	8.89
2026-09-27 12:00	13:52:13.06	-07:55:25.7	HIP 67718	3.96
2026-09-28 00:00	13:52:41.07	-07:58:38.1	HIP 67718	8.29
2026-09-28 12:00	13:53:09.13	-08:01:50.4	HIP 67718	15.46
2026-09-29 00:00	13:53:37.26	-08:05:02.8	HIP 67953	20.12
2026-09-29 12:00	13:54:05.44	-08:08:15.1	HIP 67953	13.91
2026-09-30 00:00	13:54:33.68	-08:11:27.3	HIP 67953	10.00
2026-09-30 12:00	13:55:01.98	-08:14:39.6	HIP 67953	11.17
2026-10-01 00:00	13:55:30.33	-08:17:51.8	HIP 67953	16.38
2026-10-01 12:00	13:55:58.75	-08:21:03.9	HIP 67967	20.71
2026-10-02 00:00	13:56:27.21	-08:24:16.1	HIP 67967	23.76
2026-10-02 12:00	13:56:55.74	-08:27:28.1	HIP 67967	28.63
2026-10-03 00:00	13:57:24.32	-08:30:40.1	HIP 67967	34.59
2026-10-03 12:00	13:57:52.96	-08:33:52.1	HIP 68241	29.70
2026-10-04 00:00	13:58:21.65	-08:37:04.0	HIP 68241	26.20
2026-10-04 12:00	13:58:50.39	-08:40:15.8	HIP 68241	24.73
2026-10-05 00:00	13:59:19.19	-08:43:27.6	HIP 68241	25.66
2026-10-05 12:00	13:59:48.04	-08:46:39.3	HIP 68430	27.97
2026-10-06 00:00	14:00:16.95	-08:49:50.9	HIP 68430	29.16
2026-10-06 12:00	14:00:45.91	-08:53:02.5	HIP 68430	32.27
2026-10-07 00:00	14:01:14.92	-08:56:13.9	HIP 68430	36.81
2026-10-07 12:00	14:01:43.98	-08:59:25.3	HIP 68638	36.38
2026-10-08 00:00	14:02:13.09	-09:02:36.6	HIP 68638	30.27
2026-10-08 12:00	14:02:42.25	-09:05:47.7	HIP 68638	25.16
2026-10-09 00:00	14:03:11.46	-09:08:58.8	HIP 68752	18.46
2026-10-09 12:00	14:03:40.71	-09:12:09.7	HIP 68752	10.59
2026-10-10 00:00	14:04:10.02	-09:15:20.6	HIP 68752	2.83
2026-10-10 12:00	14:04:39.37	-09:18:31.3	HIP 68752	5.37
2026-10-11 00:00	14:05:08.78	-09:21:41.9	HIP 68752	13.23