1 Ceres 2015 - ESRI:104972

WKT

GEOGCS["1_Ceres_2015", 
	DATUM["1_Ceres_2015", 
		SPHEROID["1_Ceres_2015", 470000.0, 0.0]], 
	PRIMEM["Reference_Meridian", 0.0], 
	UNIT["Degree", 0.0174532925199433]]

WKT2

GEOGCRS["1_Ceres_2015", 
	DATUM["1_Ceres_2015", 
		ELLIPSOID["1_Ceres_2015", 470000.0, 0.0]], 
	PRIMEM["Reference_Meridian", 0.0], 
	CS[ellipsoidal, 2], 
	AXIS["Longitude (lon)", east, 
		ORDER[1]], 
	AXIS["Latitude (lat)", north, 
		ORDER[2]], 
	ANGLEUNIT["Degree", 0.0174532925199433], 
	ID["Esri", "104972"]]

Data from @esri/proj-codes

{
  "wkid": 104972,
  "latestWkid": 104972,
  "macro": "PE_GCS_XT_1_CERES_2015",
  "name": "1_Ceres_2015",
  "wkt": "GEOGCS[\"1_Ceres_2015\",DATUM[\"1_Ceres_2015\",SPHEROID[\"1_Ceres_2015\",470000.0,0.0]],PRIMEM[\"Reference_Meridian\",0.0],UNIT[\"Degree\",0.0174532925199433]]",
  "wkt2": "GEOGCRS[\"1_Ceres_2015\",DATUM[\"1_Ceres_2015\",ELLIPSOID[\"1_Ceres_2015\",470000.0,0.0]],PRIMEM[\"Reference_Meridian\",0.0],CS[ellipsoidal,2],AXIS[\"Longitude (lon)\",east,ORDER[1]],AXIS[\"Latitude (lat)\",north,ORDER[2]],ANGLEUNIT[\"Degree\",0.0174532925199433],ID[\"Esri\",\"104972\"]]",
  "description": "1 Ceres 2015",
  "authority": "Esri",
  "version": "10.5.1",
  "deprecated": "no",
  "areaname": "Body",
  "extent": {
    "slat": -90,
    "nlat": 90,
    "llon": -180,
    "rlon": 180
  }
}